Articles on this site contain affiliate links, meaning we may be compensated without any added extra costs for you if you purchase a product after clicking them.

Fix Bicycle Guide

fix bicycle repair guide

In this guide, we will show you how you can fix your bicycle on your own step-by-step.

Adjust bicycle saddle

Find the right height

First, put the pedal to the bottom dead center. Then place the bike so that you can support yourself. Now sit on the saddle and put the heel on the pedal. If you leg is not straight, get off the bike and put the saddle up. Then sit back on the bike. Put the heel on the pedal and … the leg is almost straight. So you have reached an optimal position.

Step by step: Get the bicycle saddle to the right height

  1. Sit on your bike
  2. Bring a pedal to the lowest point and place your heel on the pedal axis
  3. Extend your leg
  4. If your buttocks lifts off the saddle ➜ get off the bicycle, open the quick release, raise the saddle
  5. If you cannot reach the pedals with your heel – get off the bicycle, open the quick release, lower the saddle
  6. You have set the perfect saddle height when your leg is almost straight, you reach the pedals and are sitting on the saddle.

Bring the saddle to the horizontal

If the bike has no coaster brake, the movement sequence can be optimally tested. It is important to ensure that the hip does not tip over. By the way: the saddle can also be adjusted in inclination. Ideally, this is set horizontally. If this is not the case, simply loosen the screw on the saddle and bring it into a horizontal position.

Adjust bicycle gear

Retension the shift cable

If the rear derailleur does not shift into a lower gear well, then simply tighten the shift cable on the right lever a little. Our recommendation: turn the screw counterclockwise by about one turn. Then take a short test drive. If it is still hooked, then at most make another turn. The brake should now work again.

Adjust the adjusting screw on the gear lever

It can happen that the wheel on the front chainring no longer shifts cleanly. If this is the case, unscrew the set screw on the left shift lever by one turn. If this is not sufficient, make a maximum of one more turn here as well.

Adjust bicycle handlebar

How do I adjust the stem?

So that you can sit in a sporty position on the bike, there is almost always the possibility to adjust the stem in angle or height. In the case of a conventional stem, the dust protection cap is first removed. Then unscrew the screw with a size 6 Allen key. In the best case, you can already slide the stem in or out. If this is not yet possible, a short blow to the screws is usually sufficient.

Can I also adjust an ahead stem?

As soon as you have found the optimal position for you, tighten the screw slightly and check whether the handlebar is straight. Then tighten the screw, attach the dust cap and off you go. If a bike has an ahead stem, it usually cannot be adjusted.

Change bicycle tube

Massage the tube

If there is still residual air in the tube, let it out first. Then remove the knurled nut – if present – from the valve. Next is a tire massage. “Massage” the tire around the rim arch so that it can be loosened better. Now use the tire lever to lift the ceiling and lock it in the spoke. Use the second tire lever to gradually pull the blanket off the rim. You can now remove the tube.

Check for foreign bodies in the tire

Then check whether there are foreign objects in the tire. Broken glass and thorns are common causes of a puncture. So that you can fit the new or patched tire, it should be filled slightly before installation. Next, insert the valve into the hole in the rim and lock it with the knurled nut if necessary.

Insert the tube

Then lay the tube in one piece in the rim. It is important that the tube is not twisted. Now put the tire back on. Attention: The tube must not be pinched! You should also make sure that the tire does not jump out of the rim when filling and that it sits correctly.

When the correct air pressure is reached, remove the pump head and retighten the valve nut. Don’t forget to put the valve cap on now.

Inflate bicycle tube

Different valve types

The optimal pressure

With a good pump, you only need a few strokes and the tire is properly filled. The trekking / city bike is driven at approx. 3 to 4 bar, the mountain bike at approx. 2.5 bar and the racing bike at approx. 8 bar.

Change the chain

Quick Start Guide

  1. First switch to the smallest sprocket at the front and rear and then open the chain lock with the chain lock opening pliers.
  2. Then you have to bring the new chain to the length of the old one. Put both chains next to each other. If you are working with a chain lock, you should make sure to shorten it so that you have two complete chain links at the end. If you are working with a rivet pin, make sure that you have two different chain links at the end. Now rivet the chain link with a chain rivet.
  3. Now you can thread the new chain. Make sure that the chain runs correctly, especially with the rear derailleur. Finally, you can close the chain using the chain lock.

What do you need?

  1. A new chain that matches the cassette, i.e. the number of sprockets
  2. Chain lock opening pliers
  3. Chain rivet
  4. Chain lock

Center the impeller

Quick Start Guide

  1. Check your spoke tension by lightly squeezing the spokes.
  2. See which side the wheel hits.
  3. If you have a side bellows to the left, pull the nipples of the right spokes counterclockwise a quarter turn.
  4. If you have a side wall to the right, pull the nipples of the left spokes counterclockwise a quarter turn.
  5. Install the impeller and have fun with your newly centered bike.

What do you need?

  1. Nipple clamp
  2. Centering stand
  3. Spoke counter for knife spokes

Adjust the suspension fork

Quick Start Guide

  1. Unscrew the rebound: To adjust the spring hardness unaffected, all damping settings must be unscrewed. Start with the rebound: turn the mostly red button, which is located on the underside of the suspension fork, counterclockwise until it stops.
  2. Lower the pressure level: The pressure level should also be set to the lowest possible level. To do this, turn the lever on the top of the fork counterclockwise.
  3. Deflate: Now determine the maximum stroke. To do this, loosen the cap on the top of the fork and gently press the valve with a pointed object until the air has completely escaped.
  4. Push the rubber O-ring down: In the next step, press the small rubber O-ring on the standpipe down to the seals. If the ring is missing, loosely attach a cable tie or a piece of cord.
  5. Compress the fork: Now press the suspension fork with force from above. This should deflect completely, i.e. up to a noticeable stop. If the stroke feels spongy, there may be some air left in the chamber.
  6. Pump up the fork slightly: Pump some air into the chamber so that the fork pulls apart again. Around 30-40 PSI. Be sure to use a special damper pump.
  7. Measure the maximum stroke: In the now extended state, the O-ring has moved upwards. The distance between the sealing rings on the fork bridge to the rubber O-ring is the maximum stroke.
  8. Inflate the suspension fork: Now the goal is to set the correct air pressure for your rider weight. Pay attention to the manufacturer’s PSI recommendations. If no information is given, take your body weight as an approximate PSI guide.
  9. Load the bike in the riding position: Now get on your bike, lean against a wall and load it in the riding position ). Now push the rubber O-ring down and do not apply the brakes.
  10. Determine “Sag”: Now measure the distance from the seal to the rubber O-ring. This is called the “sag”. This should be approx. 20% of the maximum stroke for CC / marathon bikes, 25% for touring / AM bikes, and 30% for enduro bikes. Pump air in or let out air until it fits.
  11. Check puncture protection: Then get on your bike and compress the fork vigorously. The distance of the rubber O-ring to the maximum stroke is the remaining spring travel. It should still be about 1 cm. If the fork breaks through, you should pump up.
  12. Check rebound: Stand behind the handlebar and compress the fork vigorously, then release the handlebar in a flash. The suspension fork swings up. You should do this as soon as possible without the tire lifting off the ground.
  13. Set rebound: Set the rebound speed (rebound) using the rotary wheel on the underside of the fork. To do this, click button by click until the speed is okay.
  14. Set the pressure level: You can also often set the deflection resistance. The higher the pressure level, the less the suspension fork bounces. Most forks offer open, damped and locked driving modes.