Bicycle Mechanics - crank length
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I'm looking into changing my standard cranks of 170mm to 160mm, but have been told by my LBS that a crankset of 160mm does not exist for my hybrid bike (Giant freerider, Dutch company). These shorter cranksets are only used by 'professionals' they say.
Can anyone help?
12-18-03, 05:56 AM
Tosh and nonsense.
Cranks are available in single, double and triple chainrings, from 140 to 190mm, if you know where to look.
Shorter cranks are used by shorter people, with shorter legs.
Shimano FC-MJ10 at
12-18-03, 11:37 AM
There is a good guide to the correct size cranks (plus lots of other great stuff) at
Short cranks are used by professionals on their special track-racing bikes, but for normal racing, they use normal sizes.
12-18-03, 11:43 AM
I changed my wife's cranks from 170 to 152 because of arthritis in her knees. They were cheap ones for a child's bike, the LBS had to order them from the local wholsaler, so they took a few days to come in. To get the chainline right I also had to change the bottom bracket.
12-18-03, 11:54 AM
i think what your LBS means is that you'll probably have to end up changing your BB also... and that the total cost of everything might end up costing more than you paid for the bike! ok... maybe that's an exaggeration, but yeah you'll probably pay a significant fraction of the price you paid for the bike
Andrew wrote - I changed my wife's cranks from 170 to 152 because of arthritis in her knees. They were cheap ones for a child's bike, the LBS had to order them from the local wholsaler, so they took a few days to come in. To get the chainline right I also had to change the bottom bracket.
How long ago did you do that? How did it work out?
12-18-03, 12:16 PM
Excuse me guys. I think it is totally inapropriate to be talking about how long your cranks are on a bike forum. There are other forums for that kind of talk.
Sorry, I couldn't resist.
Thanks a lot for this information, this has given me some ammo!
12-23-03, 09:03 AM
It was last spring that I changed my wife's crankset. I think the crankset and BB cost about $25 CAN each. I had to try several BBs before I got it right. The chainrings didnt have the Shimano bumps to help with the shifting, but it works OK. My wife isnt a power rider.
12-23-03, 11:38 AM
Specialties TA makes great cranks and you can get them here in pretty much any size you need.
Harris Cyclery has 160mm Suntour cranks at a decent price too.
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