Thread: Birdy thread
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Old 07-21-20, 12:35 AM
  #1322  
glye
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Originally Posted by RandomHajile
But figured getting a cassette is easier than changing chain ring/crank ect
Opinions may differ... If you've replaced a cassette before you know what that involves. Replacing a chainring means
1) Measure what BCD you have, and find a chainring with the same BCD, same number of arms, and right number of teeth: https://sheldonbrown.com/cribsheet-bcd.html
Also it must be a chainring made for derailer chain, as single speed chainrings are too wide for the narrower derailer chain.
2) Undo the 4-5 chainring bolts, replace the chainring, and tighten the bolts well again. Requires a hex tool and chainring bolt tool, I use a simple one like this: Bikeman Shimano TL-FC21 Crankset Dustcap Pin Tool with Chainring Nut Tool
On a bike like the Birdy you usually don't need to take the cranks off. Obviously the wheels can also stay on the bike.
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