Crank length.

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Saddle bum

Über Member
Location
Kent
I used to ride 172.5 cranks in the early 90s, but settled for 170s when I got a new iron a few years back. I've just upgraded again to 172.5s, it makes a big difference, a positive one.

Any similar experiences?
 

Night Train

Maker of Things
I've never considered crank length either. How do you work out what length you need?
 

Steve Austin

The Marmalade Kid
Location
Mlehworld
Lots of theories on this, most of them complete conkers.

long legs = long cranks. Its that simple

I use 175 on my Roadbikes and MTBs as it feels very different when changing bikes. And i've got long legs :smile:
 
a clubmate had his best ever racing season using different length cranks(by accident) he didn't realise until mid season but was going so well didn't want to risk changing them.
i had to use odd length cranks in our clubs 150 mile ride. the spider came loose on the crank so i had to put a spare on which was a different length, after a couple of miles i couldn't tell the difference.it was only 2.5 mm.
I've different lengths on all 3 bikes but haven't found much difference. clumbates swear the can and will only use certain lengths.
i buy what is going cheap in the sale which explains the differences!
 
OP
OP
Saddle bum

Saddle bum

Über Member
Location
Kent
On the wild assumption that many years ago, Britain set certain standards in bicycle technology, 6-3/4-in was the standard crank length. This translates to 171.4mm. So 170s are shorter than the old fashioned standard.

I would propose that 172.5 should be the norm for any male person of 5ft 8in high or over. Different reasoning may apply to the ladies, with certain notable exceptions, I am not an expert on female physiology.
 
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