Retrobike Forum Index

It is currently Thu Apr 19, 2018 9:03 pm

* Login   * Register * Search  * FAQ



Post new topic Reply to topic  [ 16 posts ]  Go to page 1, 2  Next
Author Message
PostPosted: Tue Sep 27, 2016 8:39 am 
Gold Trader
Gold Trader
User avatar

Joined: Fri Jan 23, 2009 2:30 pm
Posts: 14352
Location: Surrey
I'm persevering with building up a retro-ish bike for my wife and I'm wondering about crank arm lengths. She isn't the tallest so thinking a shorter crank would benefit her riding experience.

I've always used standard 175 arms myself being 6ft, so this is new territory for me. She's about 5ft 4 so would 170 or 165 be a better fit?


Top
 Profile  
 
 Post subject: Re:
PostPosted: Tue Sep 27, 2016 8:50 am 
retrobike rider
retrobike rider
User avatar

Joined: Fri Aug 08, 2008 2:36 pm
Posts: 17585
Location: Yorkshire, England
At 6ft you should be using 180mm cranks, has it bothered you not ?
At least if you have a 34"+ proper leg length.

Try 170 as you can get hold of them (it's what often came on bikes that size)


Top
 Profile  
 
 Post subject: Re:
PostPosted: Tue Sep 27, 2016 8:56 am 
.o.T.M Triple Crown Winner
.o.T.M Triple Crown Winner
User avatar

Joined: Sun Dec 31, 2006 12:59 pm
Posts: 3383
Location: Sunny South of France
170mm is fine for her !
(I've got some for sale :wink: )


Top
 Profile  
 
PostPosted: Tue Sep 27, 2016 10:07 am 
Old School Grand Master

Joined: Tue Oct 09, 2007 1:55 pm
Posts: 8949
Location: New Forest, UK
Definitely crank length needs to be match with leg length. Spa Cycles do a range of their own XD2 cranks in 160 and 165 for around £35. I have bought several over the years as the kids grew up. The quality is high, as good as midrange Shimano. IIRC they are made by Stronglight.


Top
 Profile  
 
PostPosted: Tue Sep 27, 2016 11:24 am 
Gold Trader
Gold Trader
User avatar

Joined: Fri Jan 23, 2009 2:30 pm
Posts: 14352
Location: Surrey
Cheers guys. I've a set of 170s I can use so will fit those when the time comes.

As for my own leg length, pretty sure I'm a 32" not 34 or greater. When you say has it bothered me, what do you mean? Aside from numerous cartilage operations that I can't really blame cycling for, I can't say I've noticed anything odd.


Top
 Profile  
 
PostPosted: Tue Sep 27, 2016 12:03 pm 
Old School Grand Master

Joined: Tue Oct 09, 2007 1:55 pm
Posts: 8949
Location: New Forest, UK
Too long is definitely worse than too short. Did a bike tour with 175s (I normally ride 170s) and I had knee pain throughout.

Here is a starting point...
http://www.myra-simon.com/bike/cranks.html


Top
 Profile  
 
PostPosted: Tue Sep 27, 2016 12:11 pm 
Retro Guru
User avatar

Joined: Tue Sep 21, 2010 8:08 pm
Posts: 2191
Location: East Lothian
It's about leg length rather than height.


Top
 Profile  
 
PostPosted: Tue Sep 27, 2016 8:43 pm 
Retro Guru

Joined: Sun Jun 19, 2011 9:44 pm
Posts: 1986
Location: wirral
Am 6.1" and my 20" Xizang has 180mm cranks, I have a 33" inside leg


Top
 Profile  
 
PostPosted: Tue Sep 27, 2016 11:32 pm 
Gold Trader
Gold Trader
User avatar

Joined: Fri Jan 23, 2009 2:30 pm
Posts: 14352
Location: Surrey
Well on a good day I'm 6ft, depends on when my last visit to the chiropractors was. Generally I am 5ft 11 ish.

Back to someone 5ft 4 who has to have trousers shortened to fit when buying off the peg in her size. I can start with 170mm arms and see how they go. As someone who hasn't ridden for many years she won't know what's right and wrong, so what's the best way to tell?


Top
 Profile  
 
PostPosted: Wed Sep 28, 2016 6:05 am 
Retro Guru

Joined: Mon Feb 11, 2008 9:42 am
Posts: 2822
Crank length is a bit of a red herring.
As long as they aren't too long (leading to you bending your knee too much at tdc) any length will work fine.
So saying that a 6 footer "needs" 180s is bullocks.
They might be able to use them, but there's no advantage to longer. Except in your head.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 16 posts ]  Go to page 1, 2  Next

All times are UTC [ DST ]


Who is online

Users browsing this forum: borissorin, heymarge, Retro Spud and 36 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

About Us

Follow Retrobike

Other cool stuff

All content © 2005-2015 Retrobike unless otherwise stated.
Cookies Policy.
bikedeals - the best bike deals in one place
FatCOGS - Fat Chance Owner's Group

Powered by phpBB® Forum Software © phpBB Group