DEMA GRITCH 7 Manuale utente

Cerﬁcate of warranty

Bicycle operaon and maintenance manual

Garanezerﬁkat

Fahrrad Bedienungs- und Wartungshandbuch

Záručný list

Návod na obsluhu a údržbu bicykla

Záruční list

Návod na obsluhu a údržbu jízdního kola

Garancialevél

Használa és karbantartási útmutató a kerékpárhoz

Karta gwarancyjna

Instrukcja obsługi i konserwacji roweru

Garancijski cerﬁcat

Delovanje in navodila za vzdrževanje koles

Jamstveni list

Upute za korištenje bicikla

3 - 22

23 - 43

44 - 63

64 - 83

84 - 104

105 - 125

126 - 144

145 - 162

Bicycle operaon and maintenance manual

Fahrrad Bedienungs und Wartungshandbuch

Návod na obsluhu a údržbu bicykla

Návod na obsluhu a údržbu jízdního kola

Használa és karbantartási útmutató a kerékpárhoz

Instrukcja obsługi i konserwacji roweru

Delovanje in navodila za vzdrževanje koles

Upute za korištenje bicikla

Dear customer!

Thank you for your trust and purchase of a DEMA brand bicycle. DEMA is a Slovak bicycle

brand that has a registered and protected trademark. This guide will help you setup and main-

tain your bicycle so it serves to your sasfacon as long as possible. This guide will also explain

warranty terms and serves as a cercate of warranty as well. Also, please note that the seller

must provide a complete pre-sale bicycle servicing. The manufacturer is not liable for any

injury caused by inadequate Pre-sale service, improper maintenance or misuse.

We wish you many happy kilometres!

DEMA Senica, a.s.

manufacturer

Content

Overview

Bicycle types

Bicycle preparaon for the ride

Folding bicycle service

Safe riding recommendaons

Permissible weight of the rider and luggage - recommendaons

Bicycle maintenance

Tools for assembly and maintenance

Assembly and disassembly of the wheels

The braking system

Gears

Head set, stem, handlebar, seat post and the saddle

BB set, crank set and pedals

Wheels, hubs, res and training wheels

Suspension

Racks

Cleaning and lubricaon

Maintenance schedule

Warranty

Translaons of important warning labels appearing on the DEMA bicycles

1.1

1.2

1.3

1.4

1.5

2.1

2.2

2.3

2.4

2.5

2.6

2.7

2.8

2.9

Bicycle operaon and maintenance manual EN 3

1. Overview

1.1 Bicycle types

According to their use bicycles can be divided into mountain, cross, tour, city and racing bi-

cycles. According to their size bicycles are classied as children’s bicycles and bicycles for

adults (including junior’s versions). Children’s bicycles must meet the condion of a maximum

seat height greater than 435 mm and lower than 635 mm. The bicycles for adults (including

junior’s versions) must meet the condion of a maximum seat height greater than 635 mm.

Mountain bicycle (MTB)

It is designed for driving o paved roads and is equipped with wider res with a more robust

tread paern for easy passing of rough terrain. The most commonly used wheels with dia-

meters of 20, 24, 26, 27.5 or 29 inches and 11 to 30 speeds allow handling in even the most

dicult terrain. Classic hard tail mountain bike has only front suspension, usually from 80

mm to 120 mm. In contrast to this type of mountain bike, the full-suspension bicycle also has

suspension in the rear part. However, it sll belongs to the same bicycle category. Mountain

bikes must meet property requirements set out in the EN ISO 4210 norm in force.

Cross and Tour bicycles (Cross, Touring)

Cross and Tour bikes mostly use wheels with a diameter of 28 inches and are known as the

most suitable bicycles for cycling tourism because they combine the advantages of road bi-

cycles with the advantages of mountain bike - they allow a fast ride on asphalt roads, but you

can also use them in easy terrain. Tour bicycles are usually compared with o-road bicycles

with addionally ed lighng, fenders and racks. Some models of tour bicycles are equipped

with suspension forks. This category usually has 18 to 30 speeds. Cross bicycles must meet

requirements of the STN EN 14766 norm in force. Tour bicycles must meet requirements of

the EN ISO 4210 norm in force.

City bicycle (CTB)

City bicycles are designed for riding on the roads. They are of a simple build, mostly equipped

with lighng, fenders and racks. They use wheels with diameters of 20, 24, 26 or 28 inches.

They can be equipped with a mul-speed gearbox, which is hidden in the rear wheel hub, or a

tradional rear derailleur. The number of speeds ranges from 1 to 24. This category includes

also folding bicycles. City bikes must meet requirements of the EN ISO 4210 norm in force.

Racing bicycle (Road)

It is designed for fast riding on asphalt roads. These bicycles use narrow res, occasionally

tubeless res that have a low rolling resistance and permit higher speeds. This category usu-

ally has 18 to 30 speeds. Racing bicycles must comply with requirements of the EN ISO 4210

norm in force.

Fitness bicycle

This bicycle is designed for riding on asphalt roads. Unlike in road bicycles, it has handlebars,

brake levers and shiers of a Tour bicycle. Fitness bicycles must comply with requirements of

the EN ISO 4210 norm in force.

Freestyle bicycle

The Freestyle bike is designed to run on the ground. It has a durable frame, wheels with a

diameter of 26 cm and is suitable for aggressive driving. It is intended for driving the terrain

through various obstacles, it has various ulies, extended axes for various acrobacs.

BMX

BMX is designed for eld trips. It is used for driving in special parks, based on a 20-inch dia-

meter wheel, rigid and durable frame and fork. BMX wheels must meet the requirements of

EN 16054 cat 2.

EN4Bicycle operaon and maintenance manual

Kids bicycle

Children‘s bicycles are designed to ride on asphalt roads and easy terrain. Dierent sizes

and frame diameters correspond to dierent age groups (12, 14 or 16 in.). Usually they are

equipped with auxiliary wheels. When choosing the right size of a wheel, it is necessary to ta-

ke into account the height and abilies of the child. Children‘s wheels must meet the require-

ments of the applicable EN ISO 8098 standard.

E-bike

E-bike meets the requirements of European standards EN 15194 and EN 4210-2, thus falls

into category EPAC (Electrically Power Assisted Cycle = „bicycle with auxiliary electric propul-

sion“). In terms of the law on road trac, EPAC is considered to be normal bicycle and driving

license is not required. Maximum connuous rated motor output for EPAC E-bikes is limited

to 250W. Propulsion is acvated by pedalling, where the motor assistance is cut o when the

cyclist stops pedalling and is otherwise progressively reduced and nally cut o before the

E-bike speed reaches 25 km/h.

1.2 Operang instrucons

Saddle and seat post

The saddle should be set in a horizontal posion. If it is not in this posion, loosen the seat

post lock, set the saddle to a horizontal posion and ghten the seat post lock. Saddle height

is properly adjusted when the crank is parallel to the seat tube, while the heel is placed on

the rear edge of the pedal, and the cranks are turned so that the pedal with your heel is at the

lowest posion.In this posion, your leg should be slightly bent at the knee. If not, loosen the

seat clamp bolt, or the quick-release lock, and adjust the seat post height by pulling or pushing

the seat post. Subsequently ghten the seat clamp bolt or the quick-release lock so that it is

not possible to move the seat post. The minimum inseron depth for the seat post into the

frame is marked on the seat post. The wording of this indicaon may vary by manufacturer of

the seat post (e.g. MIN, STOP, MAX, etc.).

Please note that you can use the seat post pulled out to the mark, which clearly indicates

the minimum depth of inseron of the seat post into the frame!

Quill stem

There is a mark on the quill stem that indicates the minimum depth of inseron of the stem

into the fork steerer. The wording of this indicaon may vary by the manufacturer of the stem

(e.g. MIN, STOP, MAX, etc.).

Please note that you can use the stem pulled out to the mark that clearly indicates the

minimum depth of inseron of the stem into the fork steerer!

Bicycle operaon and maintenance manual EN 5

Brakes

The le brake lever controls the front brake; the right brake lever controls the rear brake.

We recommend checking the ghtness of all joints, xing of the wheels, funconality of the

brakes and possible mechanical damage of the frame and components.

We recommend checking the ghtness of all joints, xing of the wheels, funconality of the

brakes and possible mechanical damage of the frame and components.

1.3 Folding bicycle service

Unfolding

1. Folded frame of the bicycles unfold and sele to the straight posion. Push lock lever to the

frame and secure the security lock.

2. Unfold folded handlebar column to upright posion. Secure handlebar column joint with

pushing quick release lever to the very column. Lock the lever with the security lock.

3. Pull seatpost and secure it in required posion with quick release lever.

4. Adjust height of telescopic stem.

5. Unfold pedals.

6. Do not forget to fold kickstand before the ride.

Folding

Put a bicycle on kickstand.

1. Release quick release lever on seatpost and insert the saddle to the boom end. Boom

part of seatpost serves as a lean point of folded bicycle.

2. Release quick release lever on handlebar column and insert it to the boom end.

3. Release security lock on locking mechanism of folding handlebar column. Release folding

system lever and fold handlebar column down to front wheel.

4. Fold both pedals. Fold kickstand. Take the posion on the right side of the bicycle. Release

security lock. By the le hand grab main frame folding mechanism lever, by the right hand

grab front fork of the bicycle. Release the lever by le hand, pull up front fork (wheel) by

right hand and fold front part of the frame to the rear part of the frame. Beware of any injury

on your health or damages of your clothes during folding the bicycle.

EN6Bicycle operaon and maintenance manual

1.4 Recommendaons for safe riding

For riding on public roads your bicycle must be equipped with accessories and equipment in

accordance with the legislaon in force dening the condions of vehicle trac on roads. It

is necessary to comply with the road code when cycling on roads. The bicycle that you have

purchased has passed a comprehensive Pre-sale service, as evidenced by the record in the

warranty book. However, we also recommend that aer driving for about 80km, or aer 1

month following the purchase of the bicycle at latest, you come to the seller or to a specialized

workshop for the rst service inspecon. In the course of ordinary maintenance, which the

bicycle requires, please follow the instrucons in this manual. In the case of more dicult

operaons, we recommend you seek help of a professional workshop. Children’s bicycles are

designed to travel on asphalt roads or in light terrain under the supervision of a responsible

adult. It is essenal that parents or other responsible persons properly instruct the children

about bicycle use, correct riding technique, the funcon of the brakes and how to brake.

As a manufacturer of bicycles we recommend the use of a helmet in accordance with legislaon

in force on every ride and also for safety reasons we strongly recommend the use of helmets on

o -road rides. We also recommend using footwear and clothing appropriate for cycling.

1.5 Recommendaons for the permissible weight of the rider and luggage

Manufacturer-recommended permissible weights of the rider with luggage are:

- 25 kg for children’s bicycles

- 70 for BMX bicycles

- 100 kg for folding bicycles

- 110 kg for mountain, cross, tour, city, racing, freestyle bicycles

- 120 kg for e-bikes

The maximum total weight is calculated as the sum of the weight of your bicycle and the

recommended permissible weight of the rider with luggage for your bicycle.

Follow the recommended permissible load of the bicycle and never overload the bicycle!

2. Bicycle maintenance

2.1 Tools for assembly and maintenance

The list of tools needed for basic assembly and maintenance:

- at and Phillips screwdrivers

- spanner 8mm, 9mm, 10mm, 13 mm thin type, 15mm, and 17mm

- combinaon pliers

- cable cung pliers

- allen wrenches: 2.5mm, 3mm, 4mm, 5mm, 6mm, 8mm, and 9mm

- removal tools for cranks

- removal tool for sprocket / cassee

- bent ring wrench 14 mm or 15 mm

- head assembly wrenches: 30mm, 32mm, 36mm

- re repair kit, re levers, re pump

- chain wear gauge

Bicycle operaon and maintenance manual EN 7

During assembly and maintenance of the bicycle follow the maximum ghtening torques re-

commended by the manufacturer of the bicycle listed in the table on page 164. If there are

lower torque limits marked on the components by the manufacturer, follow these torques.

We recommend using only genuine replacement parts that you purchase from authorized

dealers.

2.2 Mounng and dismounng of wheels

The wheel may be released and subsequently fall out of the fork when riding with insu-

ciently ghtened quick-release locks or nuts, which can result in damage to the bicycle or

injury or death to the rider.

Dismounng the front wheel

Put the quick-release lock lever into the open posion (OPEN). Subsequently loosen the

coupling nut by a few turns so that the wheel can be pulled out of the fork. In case of the

v-brakes use, loosen the cable.

Mounng the front wheel

Lay the wheel with the open quick-release lock on the le side on the oor and carefully

mount the front fork on the wheel axis. Make sure the wheel is properly mounted and centred

in the fork. Tighten the nut on the quick-release lock a few turns and push the lever toward

the fork into the closed posion (CLOSE). When the nuts of the quick-release lock are proper-

ly ghtened the lever must provide a slight resistance and the clamping mechanism must press

the fork dropouts. Apply a ghtening torque of 10-12 Nm.

Dismounng the rear wheel

In case of the v-brakes use, loosen the cable. Set the rear derailleur and chain to the smallest

sprocket wheel. Put the quick-release lock lever into the open posion (OPEN). Then loosen

the coupling nut a few turns so that it is possible to pull the wheel out of the frame. Li the

rear of the bicycle frame while pushing the wheel forwards and downwards unl the wheel

axle gets out of the frame.

Mounng of the rear wheel

Set the rear derailleur to the posion of the smallest sprocket wheel. Set the quick-release

lock lever into the open posion (OPEN), so that the lever is on the opposite side of the wheel

as the sprocket. Push the rear derailleur backwards and aach the chain to the top of the

smallest sprocket wheel. Subsequently aach the wheel to the frame. Make sure the wheel is

properly mounted and centred in the frame. Tighten the nut on the quick-release lock a few

turns and push the lever toward the frame into the closed posion (CLOSE). When the nuts of

the quick-release lock are properly ghtened the lever must provide a slight resistance and the

clamping mechanism must press the frame dropouts. Apply a ghtening torque of 10-12 Nmv.

If you are using disc brakes, never push the brake lever if the disc is not in the calliper, because

the seng of the brake pads will change and it will not be possible to mount the wheel with

the disc. Aer every mounng and dismounng of the wheels, check the proper operaon of

the brakes!

OPEN

EN8Bicycle operaon and maintenance manual

2.3 Brake System

Check the brake system and the proper operaon of the brakes before each ride. If the brakes

are not working properly or some parts are damaged or worn, do not use the bicycle and seek

out a specialised workshop.

The brake system consists of:

- brake levers

- brake lines

- brake shoes (brake callipers)

- rims or brake discs

Brake Levers

The brake levers must always be rmly aached to the handlebar in such a posion as to be

within easy reach.

Brake lines

Brake lines are divided into two types:

- mechanical brake lines that consist of Bowden cables and wires

- hydraulic brake lines that consist of hoses and hydraulic uid

Inspecon and maintenance of brake lines

Regularly check the condion of Bowden cables, brake wires and hydraulic brake hoses. Wires

must move freely in the Bowden cable, must not be rusty, frayed or otherwise damaged.

Always secure the wire end with end caps ng for them. Bowden cables and hydraulic ho-

ses must not be broken or cracked. If you nd any faults in the brake system, do not use the

bicycle and seek out a specialized workshop.

The most commonly used types of brakes:

- type „V” rim brakes

- rim brakes for road racing bicycles

- disc brakes (mechanical and hydraulic)

- coaster brakes

Type „V“ rim brakes

Brakes must be ghtened to the V-brake pivots on the frame or fork and must be properly

centred. If the brake blocks are distanced more than 3-4 mm from the rim, the brake wire was

pulled out or brake shoes are worn out, and the brake needs to be reset, or the brake blocks

need to be replaced. To set the brake wires use the adjustment screws that are located on

the brake lever. Ihe brake wire is very loose and the adjustment screws are not sucient for

V-brake Rim brake Disc brake

Bicycle operaon and maintenance manual EN 9

proper adjustment, return the screws to their default posion and ensure correct wire tension

following way. Loosen the fastening screw on the brake and tense the cable by pulling it. Then

ghten the fastening screw.

Rim brakes for road racing bicycles

The brakes for road racing bicycles are set in a similar manner as the type „V” rim brakes.

Regularly check the condion of the rim‘s braking surface. In case of wear have them changed

in a specialized workshop.

Checking wear:

Some rims have a measuring groove or dot - when the braking surface of the rim becomes

so thin that these checking characters disappear, it is necessary to replace the rims. Rims

which are not equipped with the above-menoned checking indicaons must be replaced if

the deecon of the braking surface of the rim is more than 0.3 mm from the original plane

shape of the brake surface, above the original plane of the brake shoes or the wall thickness

is less than 1.1mm.

Disc brakes

This type of brakes is one of the most eecve. Disc brakes are divided into mechanical

and hydraulic disc brakes. Mechanical disc brakes are controlled by a wire and hydraulic disc

brakes are controlled by liquid.

Inspecon and maintenance of disc brakes

Always keep the brake discs clean. Do not touch the braking surface with bare hands and

make sure that the braking surface does not come into contact with any grease to prevent

reducon in braking eciency. If the discs or brake pads come into contact with grease or

brake uid, they must be thoroughly cleaned and, possibly, the brake pads should be replaced.

For cleaning use special products intended for this purpose. Regularly check the condion of

discs and brake pads. If the discs or brake pads are damaged or worn, replace them with new

ones. Never push the brake lever if the disc is not in the calliper, because the seng of the

brake pads will change and it will not be possible to mount the wheel with the disc. When

replacing the brake uid, always use the type of brake uid determined by the manufacturer

of the disc brake. If the thickness of the disc’s braking surface reaches the minimum thickness

prescribed by the manufacturer, the disc should be replaced. This value is indicated on the

body of the disc. If you encounter any of these problems, do not use the bicycle and seek out

a specialized service.

Coaster brakes

If the rear brake is designed as a coaster brake (so-called „Torpedo brake”), engage it using

force exerted by the foot on the pedal in the backwards direcon. The brake mechanism

must operate independently of any posion or seng of the drive mechanism. The dierence

between the posion of the crank during riding and braking may not exceed 60°. The Coaster

brake does not require any special maintenance, an annual check and oiling is sucient.

EN10 Bicycle operaon and maintenance manual

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