user Manual
Contents
1. USER GUIDE 1 English Language Congratulations on your purchase The Twenty10 model has been designed and tested to the European standard for city bikes EN14764 2005 a Foreword The intended usage of this product is for personal transportation within an urban environment Strong merits are derived from what has been excluded from the simple design i e suspension or multiple gears The bike is tested inline with the EU standard for city bikes Whilst it is entitled to be called a BMX bike people who purchase the bike must acknowledge that competitive or extreme riding is not covered by the warranty because stresses on the bike can exceed the test conditions The original components were selected on acceptable compromises between value for money strength weight and corrosion resistance so the bike offers many years of efficient service if ridden sensibly and maintained according the this instruction manual Enjoy your bike at every opportunity Contents Type of use for which the bicycle has been designed Preparation for riding Minimum saddle height Suspension system adjustment Recommendations for safe riding Permissible total weight National legal requirements on public roads Recommended tightening of fasteners Quick release devices Self Assembly of the bike Lubrication Correct chain tension Adjustments of gears Adjustment of brakes General maintenance Replacement parts for safety critical components Care of the wh2. Brake arm s System spring tension adjustment screw o General maintenance Ensure that an experienced bicycle mechanic regularly checks over the bicycle with safety in mind Ensure that both front and rear brakes function correctly and that cables are not frayed of loose Ensure that the brake blocks are not worn below the minimum Ensure that each nut and bolt throughout the bicycle is sufficiently tight to facilitate sound function Ensure that the tyres have good remaining tread and that they are inflated to the correct pressures Ensure that reflectors are kept clean Ensure that the bell functions Ensure that each component with a mechanical movement is regularly greased or lubricated for a long life span Ensure that the chain is sufficiently tensioned and lubricated p Only use genuine replacement parts for safety critical components A qualified Bicycle technician can advise on the correct choice of replacement parts q The rims of the bicycle should be kept straight and true by a qualified bicycle technician Periodically check that the wheels have not become buckled by testing for a free rotation through a complete revolution If at any point during the rotation the wheel rim makes contact with a brake block either have the wheel straightened by a professional technician or replace with a new 26 wheel as appropriate Note If the bike is ridden with an excessively worn brake block the metal substructure of the worn out
3. brake block can score the rim surface causing dangerous weakening of the wheel In this case do not ride the bike until a replacement wheel has been fitted and the brakes correctly adjusted to the new rim r Appropriate spares For general city riding no specific spare parts are recommended In the event of a puncture or component failure walk the bike to the nearest convenient repair shop secure locking point or public transport facility Call a taxi walk or use public transport to complete your journey If left locked up in a non functioning state be sure to collect the bike by car when a repair shop is open and take the bike to them Do not leave the bike locked up in areas where thieves may consider defeating your security device 10 s Accessories Minimal accessories are fitted to the bike as original equipment See general maintenance in clause 0 above t Do not disregard the importance of suitably covering any coil springs under your chosen saddle if a child seat is fitted to prevent painful trapping of the child s fingers u Advisory note to draw the attention of the rider to possible damage due to intensive use and to recommend periodic inspections of the frame and fork WARNING As with all mechanical components the bicycle is subjected to wear and high stresses Different materials and components may react to wear or stress fatigue in different ways If the design life of a component has been exceeded it
4. n Adjustment of brakes The brake levers have barrel adjusters threaded into the lever assembly For both front and rear brakes ensure that the cable is adjusted to a position within the v brake caliper that enables the aforementioned barrel adjuster to prevent the brake lever from touching the handlebar grips when the brake is fully applied Seven recommended steps for initial set up are as follows 1 Loosen off the cable clamp on the V Brake caliper arm 2 Unscrew the lever assembly s barrel adjuster so that 50 of the full travel is available in or out of the brake lever assembly 3 Align each brake block correctly to the wheel rim surface and tighten 4 Hold the brake blocks tightly against the rim surfaces and pull the cable through the cable clamp 5 Tighten the cable clamp in this position with the cable fully pulled through as described in step 4 above 6 Screw the barrel adjuster into the lever assembly to release the brake blocks from the wheel Approximately 50 of lever travel should fully apply the brake set the barrel adjuster accordingly 7 Ensure that both of the v brake caliper arms move away from the wheel rim simultaneously and by an equal distance when the brake lever is released This can be achieved by adjusting the spring tension screws that are located near the pivots handlebar grip lever z cable clamp y TH j A brake lever barrel handlebar adjuster V brake calliper V
5. 2Nm Saddle to seat post lateral bolt 14Nm Seat pillar binder 5Nm Front wheel spindle Nuts 20Nm Rear wheel spindle Nuts 30Nm i No Quick Release clamps are used on the bike as an anti theft precaution This increases security when locked up in public places j The Big BMX is normally supplied fully assembled by the retailer In cases where the bike has arrived with the end user in an incomplete state of assembly always ensure that an experienced and qualified bicycle technician completes the assembly process Failure to comply with this recommendation may invalidate the warranty of the product The following steps are required to fully assemble the bicycle as it is removed from the original packaging i Create a clean and tidy work space in which to assemble the bike You will require a simple toolkit with a narrow adjustable wrench and 5 amp 6mm Allen keys Use the shipping carton as a bin for the inner packaging ii Carefully open the cardboard shipping carton and lift out the Saddle assembly and the other small box which contains the pedals and reflectors Lift out the bicycle together with the wheels which may be attached with tie wraps and tape as shown in photo 1 Carefully separate each part and dispose of all packaging Arrange the components as shown in Photo 2 to ensure that all necessary contents are present Note Take special care not to stretch or kink the outer cable of the rear brake which is pre attached to t
6. edals because the left hand pedal has a reversed thread Finally fit the chain guard bell and reflectors and adjust the tyre pressures Check that the handlebars are aligned to the wheel use a spoke key to true the rims and follow the instructions under parts 0 n b c h and q in this user manual to ensure that the bike is safe reliable and comfortable to ride k Lubrication Regularly lubricate the chain with a suitable product Do not attempt to lubricate the brake components as this may contaminate the reaction surfaces Periodically take the bike to a qualified bicycle technician to have the bottom bracket headset hubs and brake components suitably greased I Correct chain tension is achieved by loosening the rear axle nuts and adjusting the longitudinal axle adjusters within the dropouts Re tighten the axle nuts whilst holding the wheel centrally between the chain stays and rotate the cranks through a complete rotation If during the rotation the chain becomes tight or excessively loose repeat the adjustment procedure as above Assessment of chain tension should be done by measuring the maximum vertical deflection at the midpoint of the chain half way between the front chain ring and the rear sprocket No more than 40mm of vertical movement should be attainable at this midpoint within a full crank rotation m No gear system is fitted to the bike in order to reduce weight maintenance and initial purchase cost
7. eel rims Appropriate spares Accessories A note on child seats and incompatible saddles An advisory note for your safety Page 10 10 10 10 11 11 11 b Preparation for riding Saddle Height Adjustment Ensure that the both feet can touch the ground whilst seated upon the saddle There is a minimum insertion mark on the seat post that should not be exposed above the frame So long as this marking is tightened fully within the seat tube the bicycle is being operated within the tested range Brake Configuration The bike should be set up with the right brake lever operating the front brake and the left brake lever operating the rear brake Ensure that you are familiar with the configuration It is customary for continental bikes to have the brake controls in the opposite configuration If the opposite configuration is more familiar or instinctive to you the rider then it could be advantageous to unhook the caliper arms and swap the cables to the opposite levers through the slots in the barrel adjusters see part n c Minimum saddle height Ensure that you can pedal safely through a complete rotation of the pedals d Suspension Adjustment No suspension components are fitted to the bicycle to minimise maintenance and weight and for optimal energy efficiency within an urban environment e Recommendations for safe riding Always use a bicycle helmet Ensure that regular checks on brake cable adjust
8. he handlebar and the frame ii vi vii viii Attach the handlebars to the stem by removing the handle bar binder plate from the front of the stem and re fitting with the handlebars in place Ensure that the handlebar is centrally located within the clamp and at a similar vertical angle to the fork blades whilst tightening the four bolts Insert the seat post into the frame beyond the minimum insertion mark and tighten the clamp Also ensure that the saddle clamp at the top of the seat tube is fully tightened with the saddle angled to the rider s preferred orientation For reasons of comfort some people prefer the rear end of the saddle to be slightly lower than the front The new owner of this bike may find a preferred position through trial and error Insert the front wheel Ensure that the hook washers engage with the holes in the fork dropouts Tighten the wheel nuts whilst ensuring that the wheel rim is centrally located at the top of the fork blades Sometimes the wheel rim can move off centre whilst tightening the wheel nuts so be prepared to loosen the nuts and retighten several times over to achieve a central position A well centred rim is vital when setting up the front brakes Thread the front brake cable into the respective V brake caliper arm and follow the instructions for brake adjustment under part n within this owner s manual Tighten the pedals into the cranks Note that there are left and right handed p
9. may suddenly fail possibly causing injuries to the rider Any form of crack scratches or change of colouring in highly stressed areas indicate that the life of the component has been reached and it should be replaced 11 12 290310
10. ment and brake block wear are carried out by a qualified bicycle technician Be aware of possible increased braking distances in wet weather and periodically apply the brakes to clear water from the rim braking surfaces Be sure that the tyres are correctly inflated and that they have sufficient remaining tread Avoid ice patches when riding in winter Always use lights at night Never approach a road junction on the inside of lorries or busses where they may be turning across your path they may not see you Always ride well clear of parked cars where doors may be opened into your path Be alert keep your eyes out for any potential dangers throughout every ride f Permissible total weight The maximum combined weight of the bicycle rider and luggage should not exceed 100kg mass or 1000N Mass of rider and luggage being equal to this figure with the bike s mass subtracted g Requirements for the public Highway Ensure that the bicycle complies with BS6102 at the point of purchase The bicycle must have front and rear reflectors a bell and a chain guard Tyres should have sound remaining tread and wheels should also have reflectors Both front and rear brakes should function independently It is the responsibility of the rider to ensure that they do not compromise their own safety or the safety of other road users around them h Recommended tightening of fasteners Handlebar binder on stem 17Nm Handlebar stem onto fork steerer tube 1
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