What is a common bike tune up?

Bike Tune Ups

When I start a bike tune up I usually follow a routine. I start with the wheels by removing them form the bike and installing them one by one on the bike truing stand. I like to use the Park Tool TS 2.2. My stand is about 8 years old and has been good to me with just minor adjustments needed. A truing stand is a must too completing a bike tune up.

A typical wheel true in a shop would consist of the lateral adjustments also called the side to side adjustment. If anything more than this is required it is an additional cost that may be added at the discretion of the shop. This is because more time will be taken that falls outside of a basic tune up. A good shop or mechanic should evaluate the bike at the time of drop off with you there to discuss options.

After truing both wheels they are installed back on the bike. I forgot one step which is to check the hubs for side to side play. This can be done on the bike or on the truing stand. Most adjustments may be required and are included in a bike typical or basic tune up. Loose ball bearing type hubs are most common for this opposed to sealed cartridge style.

At the time of wheel truing an experienced mechanic will do a check for loose or broken spokes during the tune up. These things sometimes do not show up when performing the wheel true. I once rode with a broken spoke for two rides before I realized one spoke had broken off at the nipple. If this happens to you on a ride most spokes can be twisted onto a neighboring spoke until it gets repaired. As long as you do not hit a pot hole hard and fast it can stay in true.

Once the wheels are back on the bike make sure that they are centered in the drop outs before you start the brake adjustment. A brake adjustment is a major component that is included in every bike tune up. By centering the wheels you are insuring that the brakes will be adjusted to a straight wheel rather than off center wheels. This may be noticeable when the wheels are removed and installed like transporting your bike in the car and then reinstalling the wheels, the wheels may center themselves and then you will find the wheel is now rubbing the brakes. 

Resetting the cable at the brake’s pinch bolt is a must if the brake lever is close to or touching the handlebar or grip. This will take all the slack out of the braking system. A good tune up will remedy this common problem. This also means some brake pad material has been used up and is no longer there. This missing brake pad material is normal wear and tear and at some point the pads will need replacement. 

Derailleurs are next on the list of a bike tune up and will be the most important component as well as the most troublesome for most bike owners to adjust on their own. If your bike has derailleurs think of them as having two transmissions on your bike. These help you pedal with efficiency and speed. The higher the level of component the easier it is to adjust and the longer it will stay in adjustment form a mechanics perspective keep in mind an ongoing evaluation of bike and components are being done at this time.

Inspection in a bike tune up is crucial especially for a bike shops profitability. Evaluating wear and tear items like chain, brake pads, tires, saddle, hand grips, fraying cables & housing are important. Things like suspension fork and rear shock should be kept track of as well by hourly use. Inspect shocks by looking for torn seals, oil leaks and deep scratches in the stanchion tubes. 

The last two procedures to be completed in a bike tune up are a bolt safety check and air in the tires. Be sure to put a tool on every visible bolt to check for tightness. A torque wrench is the best first choice especially if you lack the experience to manage this by feel. Every tire’s psi can be different so be sure to find this information on the sidewall of the tire. Filling up to about 80% of the recommended tire inflation is a good place to be. This allows the tire some flex and bounce while allowing for cushion and grip in return. Of course rider weight and cargo must be taken into consideration.

The many beautiful layers of the rear derailleur.

The Different Personalities of the Rear Derailleur

When adjusting a rear derailleur I like to break it down into segments. There is a starting point I like to refer to as home base or restarting the computer. This is the place you will start when first installing a rear derailleur on to the bike and the the place you will start when you get confused and need to re-establish what exactly is going on. Home base, just like playing hide n go seek as a kid, you need to establish common meeting ground. It will also help you to find the problem of why the rear derailleur is having trouble.

The derailleur and the chain will be referred to synonymously. The chain is going nowhere unless the rear derailleur tells it to move. The chain and the shifter should always be on the same page. It’s up to you to keep track at all times. One of the best ways to do this is to pay close attention to the clicks in the shifter at all times. If you hear or in some cases feel a click then there should be chain movement. 

One click should equal one gear change of the  rear derailleur (cassette or cog, chain). In some cases two clicks of the shifter can happen very quickly but are often missed by the operator and the operator ends up lost immediately. People are surprised at how intricate a shifting system can be. There are a lot of variables and every bike has a different temperament. Not all derailleurs and bikes are created equally. 

You must take into consideration the age of the component and the level or model. Cost plays a big part I this. Typically the more you pay the better the materials, engineering and quality in most cases. What this means is the more you pay the lighter the part and performance is enhanced. If a rear derailleur, shifter, cable and housing are tired or dirty and has many miles on it then you must take this into consideration as well.

If the moving parts of the component are not working the way they use to when they were new, this usually means the pivot points in a rear derailleur are not as tight, there is more play between hinges. All this adds up to looseness or play that may not be felt all the way back to the shifter. It’s like having a worn out shoe or loose shoe laces. Your foot will slide even it is a small amount but this will add up over time causing a blister. 

When this happens to a rear derailleur some of this can be addressed with the barrel adjuster until it can no longer, then what? How do you diagnose a worn out rear derailleur? How can you tell if the derailleur alignment is incorrect? Which one is to blame? Stay tuned. 

A.R.

I hate patching tubes.

Bicycle repair service in willow Glen CA. The shop is easily accessible and located on the corner of Pine ave and Jaunita Ave. You can find it between the major streets if Bird ave and Lincoln ave in San Jose. This is a neighborhood friendly bike repair shop that caters to family bikes to serious bike racers. We cover basic repairs like flat tires, brake and derailleur adjustments to ground up bare frame bike builds. We cover the serious mountain bike that rides in the Santa Cruz Mountains to all sorts of weekend warriors and commuters.

Replacing a Tube vs. Patching a Tube

Bike repairs can fall into different categories. The most common are flat tire repairs or often called tube replacement. Bicycle tubes are replaced now a days rather than repaired by patching. Patching can be unpredictable. If the patch is not applied correctly it can and will fail. Usually by the ends of the patch coming up by loosing adhesion.

The most common error when repairing a tube by patching is the preparation. If you are in hurry and do not scuff the area enough or most commonly not covering a big enough area for adhesion. The size of the prep area should be twice the diameter of the patch size you are using.

Scuffing of the area should easily be seen after the patch is applied. This goes for the glue as well if you are using a patch kit with glue. The area the glue should cover should be at least a size in a half if not doubled in size of the patch size. Using a little extra glue could mean the difference between a long lasting patch job or the patch failing off the the next day. Another important detail is trying not to touch the prep area with your fingers. Any dirt or natural oil from your fingers can contaminate the adhesion process.