Bike Derailleur
February 28, 2009 2:33 am
its coastline is being built with are usually many items to a hand second mountain bike and each tends to vary in their composition. Described here are key points to consider in the most common components.
Wheels
Once the bike upside down and check the status of the tires. Watch out for dents or fractures in the metal and spin both wheels to see if they match with. Any problems with the tires can slow performance and a deformed wheel. When you turn the wheels, pay attention to how the bearings function. Wheels should turn almost silently and with very little resistance. Any noise or resistance to turning the wheel could be a problem with the bearings and may mean it needs replacing.
Brakes
There are a number of different types of brake used on modern bikes, but they all do the same job, so the best way to prove that is to get on the bike and use them to stop. Use both brakes individually in order to highlight problems and look out for weak braking power, excessive noise, shuddering or having to use much force to activate the hand brake. Also check the brake cables for any wear or separation ... any damage to the cables may spell trouble for braking power, especially for hydraulic brake reservoirs, so give them a good inspection. For be honest, most problems can be corrected by making small adjustments but be prepared to pay for new cables, pads, levels and even joint braking if there is significant wear / damage
Framework
Arguably the most important part of the bike to inspect. Almost every frame is different, but there are some common elements that should be reviewed. First examine the welds in the frame. Are the cracks or weak spots clear? And the top tube and down tube are in good condition? Do not be afraid to apply a reasonable amount of force on each side of the table, should be able to hold a great and if you see any weakness or excessive movement, the frame is severely compromised. In some cases, the framework can be re-exercised or strengthened but it is unlikely that is worth your time and there are more bikes in the sea. The general state of the structure should be good. If there are lots of dents or nicks in the frame that may suggest the bike had a lot of use or has been treated badly.
Saddle
Check the condition of the saddle cover and take a look fixations below as well. Try adjusting the seat up and down. This should be easy to do and the seat post should not engage at any time. a mountain bike, suspension can come in many forms, so that once again the best way to prove it, is to use it. To test the front forks, repeatedly suggest harm. Remember though that many types of suspension travel allows adaptations to march to give a firmer or softer, in test mode two ends of the supply of forks.
Some forms of oil from the discontinuation of the forks. If this is the case, then wipe both covered table, apply some downward pressure on the handlebar and see if there is any oil in the forks when the suspensions were expanding out again. If there is more oil then likely a problem with fork and seals will need replacement.
To check the rear suspension, downward pressure on the chair. As with the front fork should not be on quality, the price of a new chain can be very strong and therefore will want to inspect the current status. A good chain should not can be easily replaced, but beware, one locked link often means there will be others. Council of the bike upside down and give the chain rotation some good. It should be smooth, quiet and easy to convert.
Gears
The one good look at the condition of the wheels ring gear and the first string. Sometimes you can damage teeth and nicks can bend or lift, which must be repaired. Check if they are safe to try to move guide the chain onto the chain rings without problems. Verify that there has been bent out of place or picked up any serious harm. Impact on brands are derailleurs key gift misuse of the bicycle. The rear derailleur should do a similar job, guiding the chain on the rear gears easily and smoothly. Push the bottom of change the front to wind the string and let it move back into position. This line of travel again should be smooth and require little effort to do so. is to use them. Ride the bike a little and go through all the possibilities that there is gear ratio. The change between gears should happen quickly, smoothly and without too much noise. When cycling in each gear the action must be the same and there should be no cracking or coming from the derailleurs. Tuning can often solve most problems with gears but the person selling the bike should sort themselves first, and if not, then they can sometimes suggest there could be more terminal damage that could not be fixed without new parts
Cranks
When cycling the bike it is likely that you notice any problems with the game rods, if any. Things to consider would be any movement of the bottom bracket, apart from the rotation in the single dimension intended. Similarly, any side to side or up and down movement should be investigated thoroughly. Feel the resistance to pedaling and watch for any strange sound, like scraping or clicking. If there are sounds strange then it may be that the bearings are gone or that there is a movement in the bottom bracket. Worth having a visual check of the crankset as well to reveal any fracture or bending of the crank arms (they will need replacing if any) or any other damage to the bottom bracket or pedals.
Handlebar and stem
Often there is a large amount of force exerted by the handlebar and stem of the bike, especially in a heavy landing. By this reason, tend to be well armed and built from strong materials. However, double, split worse, the fracture of metal is not uncommon and should be sought. Stickers can sometimes hide damage and you should ask them to be removed before you buy. Also look out for the repair work in the bars or stem (as indeed should the whole frame) and must be alert to anything that appears to have been re-welded or repaired amateur.
To reiterate what was said earlier, the best way to evaluate Mountain biking is to give a good ride. If everything on the bike is in good condition the seller should not bother to test it, and if any problems will soon become apparent.
About the Author
Duncan Heath is MD of
Extreme Sports Trader
The best place to find a Second Hand Mountain Bike in the UK
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