Inverse Principle of Bike Mechanics
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As a professional bike mechanic again after 30 years, I'm discovering some inverse principles about bikes.
1. The smaller the bike, the more trouble it is to work on.
Kid's bikes with bolt-on wheels and coaster brakes and training wheels are a pita just to change a flat. And sometimes they have chainguards you have to remove before you can do anything else. Yesterday I had to tune up a kid's Lightning McQueen bike with plastic covers over the spokes, so couldn't true the wheels until I removed the wheel from the bike and removed the plastic covers (4 screws with tiny nuts). That bike also had the fork backwards and a front rim brake way out of kilter and a very sticky bottom bracket. Then there are the BMX bikes with 20" wheels that have the long steel pegs on the axles and weigh a TON.
2. The cheaper the bike, the more work it needs, but the less the owner wants to spend.
We put in $65 of work on a really cheap bike with a stripped pedal thread on a steel crank arm. Gave it a used crank from another cheap bike (because we didn't have anything appropriately cheap in new parts) and even swaped the BB spindle. The owner had the nerve to say "I only paid $50 for the bike. Can you give me a price break?" 
Then sometimes we get the opposite, people who make you smile. Like the woman I called to tell about extra things I found wrong with her bike, so the repair going to be expensive. She said "I really love the bike, it fits me perfectly, so do the work." Or the man this week, when given the choice of having his flat repaired in one day, or leaving the bike for 3 days for a full tune-up, chose the quick flat repair because he rides so much he didn't want to be without the bike for 3 days. But he will come back for the tune-up in the fall because he wants to treat his beloved 20-year-old bike well. I also enjoyed helping a couple of youngsters this week who I bet are going to grow up to be bike mechanics.
Oil is good, grease is better.
2007 Peter Mooney w/S&S couplers/Terry Butterfly
1993 Bridgestone MB-3/Avocet O2 Air 40W
1980 Columbus Frame with 1970 Campy parts
1954 Raleigh 3-speed/Brooks B72