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The Spoke Curriculum - Session 1: Difference between revisions
The Spoke Curriculum - Session 1 (view source)
Revision as of 05:15, 16 February 2012
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=== Description === | === Description === | ||
Back-to-front examination of individual bikes. | |||
=== Details === | === Details === | ||
Wipe down bike to make it easier to inspect (explain not to use a water hose!). Start with the drivetrain. Turn the cranks. Check: rear shifting/derailleur, front shifting, pedals, bottom bracket, rear brakes, rear hub, rear spokes. Check chain wear, chainring wear, jockey wheel wear, cassette/freewheel wear. Check front hub, front spokes, front brakes, headset. Check tires & tubes. Check housing & cables for breaks/kinks/corrosion. Check bar grips/saddle for deterioation. Check stem height (not too high). Check the seatpost (make sure it's not seized). | |||
=== Content === | === Content === | ||
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Now that you've chosen a bike, put it in the bike stand and check over it thoroughly to see what work it needs. This is called "service writing" in a bike shop, and is an important skill. Figuring out what needs to be done avoids surprises: you don't want to spend a month fixing up a bike, only to discover at the end that you can't adjust the seatpost. | |||
If the bike is quite dirty, wipe it down first so that you can see the components better, and so you don't get as dirty while working on it. Never use pressurized water to wash a bike! It gets into bearings and washes out the grease, and then rusts. A cloth and mild cleaning solution works well. | |||
Follow the "Bike Doctor's Diagnosis" chart to check the bike. Start with the drivetrain. While turning the cranks, check the full range of rear shifting. Does it shift well? Does it reach the full range? Does it fall off? Now check the full range of the front shifting for the same. Check the pedals. Do they spin freely? Do they feel loose? | |||
Grab the cranks and try to wiggle them side-to-side. Is there play? | |||
Turn the rear wheel. Does it spin freely and run straight (true)? Are there any flat spots? Pull on the rear brakes. Do they stop the wheel well? Do the brake pads hit the rim squarely on both sides, without going above or below the rim? | |||
Grip the rear wheel on opposite sides, and try to wiggle them side-to-side. Is there play? Grab pairs of spokes and pull, checking all the spokes, feeling for very loose spokes or broken spokes. | |||
Measure the chain to determine chain wear. Look at the chainrings, cogs and jockey wheels for wear. | |||
Check the front wheel for play. Check its spokes. Check to see if it spins freely. Check it for true and round. Check the front brakes. | |||
Check the headset for play by gripping the fork with one hand, and wrapping the other hand around the headtube and headset. Try to rock the fork, and feel for movement in the headset. You can also check for headset play by putting the bike on the ground, holding the front brake with one hand while holding the headset/headtube in the other, and trying to rock the bike forward and back. Check that the handlebars turn easily, and without any notching. They should turn towards gravity on their own. Check that the stem height isn't above the minimum insertion line (you shouldn't be able to see it: if you can, it's dangerously high and can break). | |||
Check the tires for wear and tubes for air pressure. Before inflating the tires, make sure the tire is properly mounted and doesn't have any holes. | |||
Check brake and shift housing and cables for breaks, kinks, and corrosion. | |||
Check bar grips and the saddle for deterioation. | |||
Adjust the seatpost to make sure it can be moved. | |||
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Distribute the "bike doctor's diagnosis" repair charts and assess bikes one-on-one with students. | |||
|} | |} | ||
== | === Specific Skills === | ||
{| class="wikitable" | |||
|+Repair Skills | |||
! scope="col" | Skill | |||
! scope="col" | Content | |||
! scope="col" | Reference | |||
|- | |||
| Drive Train | |||
| | |||
| http://www.parktool.com/blog/repair-help/trouble-shooting-a-creaky-or-noisy-drive-train | |||
|- | |||
| Seatposts and Stems | |||
| | |||
| http://www.parktool.com/blog/repair-help/seized-seatposts-and-stems | |||
|- | |||
| Handlebar Grips | |||
| | |||
| http://www.parktool.com/blog/repair-help/handlebar-grip-installation | |||
|- | |||
| Spokes | |||
| | |||
| http://www.top10bikefixes.org/images/straighten-wheel/check-spokes.jpg | |||
|} | |||
=== Description === | === Description === | ||