jgravois 08.19.2013

introduce yourself and group. ask what people are most curious about.

send people who want to fix flat tires group out with david...

1. A checklist for periodic tune-ups

keeping tires pumped up and lubricating your chain are the only skills that should be considered absolutely mandatory to be able to ride a bike for transportation

while people typically cite bike 'performance' as the primary motivating factor for spending more money on a bike, dependability and ease of ownership are significantly more important.

there is no right or wrong answer to the question, 'how much should i spend?', because each person has a different tolerance for the amount of tinkering which is necessary to keep a bike running.

safety check

a. check hubs, bottom bracket and stem to ensure that they are properly adjusted
b. check brakes to ensure that they provide appropriate stopping power, (and don't squeak excessively.)

if not, are the pads touching the rim wall (and rim wall only)? has the cable stretched, or become caught on something? are the brakes, 'toed-in'? is the surface of the pad brittle? what about bikes with steel wheels?

we'll get to shifting later

2. Adjusting brakes

cable stretch is a natural part of life. that's why barrel adjusters were invented

caliper brakes

side-pull brakes are easier to work on than center-pull brakes
most(not all) nice caliper brakes have a adjustment bolt in the middle of the brake assembly for centering.
the back bolt controls assembly installation
the front bolt (if present) often controls load on springs

cantilever and v-brakes

why are they used? a noodle allows quick disassembly to remove larger wheels
spring tension on both arms is necessary to keep pads off the wheel.
install pin often has three possible locations, best to start with the middle
sometimes the spring itself can be bent to provide more spring, sometimes not.

3. Fine-tuning shifting

a. make sure derailleur hanger is straight (in front make sure arm is parallel and close to chainring)
b. set limit screws
c. add cable tension, (shouldn't take a lot).
d. if its still not shifting right, even after recabling the bike, its likely that either the cassette, chain or both are worn out.

4. Finding/fixing squeaks and other strange noises

do you hear it when you're coasting?
don't be afraid to swap parts out to help find the culprit

if you really just wanted an excuse to buy a new bike, i support you!