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PostPosted: Sat Jan 07, 2017 7:42 pm 
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Joined: Fri Jun 03, 2016 5:08 pm
Posts: 929
Also have a 31inch inseam. Industry standard seems to be 172.5mm, but would like to try 170mm.

http://bikedynamics.co.uk/FitGuidecranks.htm

Seems most recommendations are a bit shorter than industry standard.

Also apologies for question spam recently :P


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Posted: Sat Jan 07, 2017 7:42 pm 


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PostPosted: Sat Jan 07, 2017 7:44 pm 
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Joined: Thu Apr 08, 2004 6:19 am
Posts: 595
Location: nr Derby, UK
I'm very close to your proportions and use 170mm cranks. It works fine for me. Try it and see!


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PostPosted: Sat Jan 07, 2017 7:46 pm 
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Joined: Tue Jan 28, 2014 6:52 pm
Posts: 1484
I'm 6 ft tall and love 170s with a low enough gear that I can spin up hills.

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PostPosted: Sat Jan 07, 2017 7:46 pm 
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Nice, that's reassuring thanks guys!


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PostPosted: Sat Jan 07, 2017 8:11 pm 
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Joined: Wed Mar 05, 2014 9:20 pm
Posts: 100
170 used to be basically the standard for road bikes, dunno why its changed.


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PostPosted: Sat Jan 07, 2017 8:37 pm 
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Joined: Tue Jan 17, 2012 4:01 pm
Posts: 1575
Location: Downtown Los Angeles, CA
I have a 32" inseam and have used 175 and 165 back to back for a good portion of last year and never noticed a difference. I use 165 primarily now because it gets me a high saddle position, so more drop and theoretically allows me to get lower without running into issues with cutting off breathing or knee hitting the chest.

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Strava
Current Stable. The Snob Machine | The Crumpton
The Ex's. LS Siena: 6.21kg | Parlee Z5 SLi: 5.9kg | LS Xicon: 5.76kg | C59: 5.7kg | Cervelo R5ca: 5.09kg | Fuji Altamira SE - 6.2kg | Scott Foil - 6.2kg | Evo - 5.18kg | LS Classic - 6.7kg


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PostPosted: Sat Jan 07, 2017 8:47 pm 
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Joined: Sat Dec 13, 2003 2:25 am
Posts: 4962
Location: Canada
It is all personal preference. I ride 172.5s road, but have tried 175s and 170s. Going longer was weird, while going shorter was just horrible. Try them and see!


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PostPosted: Sat Jan 07, 2017 8:54 pm 
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Joined: Mon Dec 26, 2016 3:00 am
Posts: 103
Location: Connecticut USA
Always had 172.5 at 5'9. May try 175 on the winter build up.


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PostPosted: Sat Jan 07, 2017 9:02 pm 
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Joined: Fri Jun 03, 2016 5:08 pm
Posts: 929
I had 175's on all summer, really liked it when getting in the most aero position on the hoods and sitting on the nose of the saddle. Also felt nice climbing out of the saddle.

Never really felt right most of the time though. Odd that I'd even notice it.. was sort of glad to sell it on.


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PostPosted: Sat Jan 07, 2017 10:09 pm 
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Joined: Sun Feb 28, 2016 10:26 am
Posts: 67
Location: Spain
I've had a Fuji SL1 RC with 175mm cranks, at the same time a Trek 8500 MTB with 172,5mm cranks, and at the same time a cyclocross Scott with 170mm cranks....So I guess there's no problem.

Now I only have my BH G6 with 172,5mm hehe.


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PostPosted: Sat Jan 07, 2017 11:35 pm 
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Joined: Tue Jan 28, 2014 6:52 pm
Posts: 1484
The fact is that the difference between 170mm and 172.5mm is very small. If you already have 172.5 cranks, I wouldn't even bother upgrading.

One thing I like about going from 175s to 170s was the decreased hip angle. I raised the saddle and left the bars where they were so I was more aero and there was more room between my tummy and thighs.

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Colnago C59


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PostPosted: Sat Jan 07, 2017 11:57 pm 
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Joined: Tue Jan 13, 2009 2:35 am
Posts: 768
I'm about your height, and I have pretty long legs for my height. I run 172.5 on most of my bikes, but have 167.5 on the track bike. I don't notice the difference at all. In fact, I'd kind of like to go to 170s on the road bikes to decrease hip angle, but I just haven't done it yet.


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PostPosted: Sun Jan 08, 2017 12:39 am 
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Joined: Tue Aug 12, 2014 3:50 pm
Posts: 1017
Location: FIN
Is thickness of all road shoes equal ? Or can vary even 3-4mm ? insole thickness ? Sock ? Pedal stack ? Inseam vs height ?

Being 182/85 inseam ( saddle height 75.5 from BB c ) I rode 170, 172,5 and 175 . Going directly from 170 to 175 and backwards ( same bike, shoes & pedals ) I felt some difference, but got use to it very fast. Cadence will drop a bit on longer crank (2-3rpm on 5mm difference ), that's it.

BTW didn't Wiggins change crank length from 177 to 170 recently ? / being 190-ish /

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PostPosted: Sun Jan 08, 2017 1:37 am 
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Joined: Sun Sep 07, 2014 4:16 am
Posts: 52
Image

Most people will never notice unless your going from one extreme to another .


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PostPosted: Sun Jan 08, 2017 1:46 am 
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Joined: Tue May 23, 2006 4:33 am
Posts: 1089
There's a huge thread on this forum about crank arm lengths. And some very good discussion of issues in it. You might take a look at that. It covers the whole topic pretty exhaustively.


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Posted: Sun Jan 08, 2017 1:46 am 


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