Weight Weenies
* FAQ    * Search    * Trending Topics
* Login   * Register
HOME Listings Blog NEW Galleries NEW FAQ Contact About Impressum
It is currently Sat Oct 01, 2016 8:26 am
Recently the board software has been updated and there are some known bugs/failures:
- Avatars are currently not being displayed ✔ FIXED
- Tapatalk connection is currently broken ✔ FIXED
- Avatars cannot be uploaded ✔ FIXED

Please note that we will soon do some changes in WW board template design in case to get a fully mobile/desktop responsiveness board!
If you find more errors please post it here: http://weightweenies.starbike.com/forum/viewtopic.php?f=7&t=139062


All times are UTC+01:00





Post new topic  Reply to topic  [ 9 posts ] 
Author Message
PostPosted: Tue Dec 04, 2012 9:32 pm 
Offline

Joined: Sat Nov 03, 2012 7:08 pm
Posts: 21
Location: London
Hi,

I am about to change from 172.5 cranks to 175. Does anyone have experience with having to change their saddle position as a result of similar change, and if so by how much?

thank you.


Top
   
Posted: Tue Dec 04, 2012 9:32 pm 


Top
   
 
PostPosted: Tue Dec 04, 2012 9:51 pm 
Offline
User avatar

Joined: Wed Oct 31, 2007 10:32 pm
Posts: 8335
Location: Los Angeles / Glendale, California
Why are you changing your crank length?

It isn't a simple matter of raising or lowering your seat height, and if your fit is sensitive (which, as you get older it will be) you may seriously damage your knees.

Why, you ask?
With the increased crank length not only will your legs be extending further, they will also be going up higher at the top of the cycle.
So unless your femur or shins grew to compensate, why are you changing your crank length?

_________________
Exp001 || Other projects in the works.


Top
   
PostPosted: Tue Dec 04, 2012 10:16 pm 
Offline

Joined: Sat Nov 03, 2012 7:08 pm
Posts: 21
Location: London
I am changing since I am upgrading my crankset and I wanted to try a longer crank while at it. I am 6'1 with a ~92cm inseam, and I am also more of a 'gear masher'. Given the above and my reading around the subject I believe it is worth trying 175mm cranks.


Top
   
PostPosted: Tue Dec 04, 2012 10:45 pm 
Offline

Joined: Tue Aug 02, 2011 5:54 pm
Posts: 346
This exact subject was covered fairly recently.

viewtopic.php?f=3&t=107646


Top
   
PostPosted: Wed Dec 05, 2012 11:03 am 
Offline
User avatar

Joined: Wed Oct 06, 2004 6:55 pm
Posts: 2367
Location: Vienna, AUT
With those measurements, you should have been on 175s all along.
When raising the saddle down to compensate, remember that you also need to adjust the saddle aft to find the same position you had to the BB you had with the shorter cranks.


Top
   
PostPosted: Wed Dec 05, 2012 4:57 pm 
Offline
User avatar

Joined: Sat Aug 29, 2009 4:30 pm
Posts: 1936
When I change crank length, I do raise/lower the seat the same amount to keep the maximum leg extension the same. I am only 173 cm tall, but have a 84 cm inseam, and I have experimented with cranks as long as 180mm. I was really surprised that it was not a lot more difficult to spin the longer cranks, in fact they felt quite good. But I settled back to 175mm anyway, just because I didn't want to be getting to extreme or exotic with my equipment. I think you may be surprised that much of the "conventional wisdom" about crank length just doesn't hold true when you actually try them. Most studies end up claiming that length doesn't make much difference anyway, so it can't possibly be hurting too much to try them.

On the other hand, when I switched from speedplay pedals to Dura Ace, I should have raised my seat by a couple mm due to stack height differences, but I didn't. They seemed just fine without adjustment. So maybe I am just not all that sensitive to things. :)


Top
   
PostPosted: Thu Dec 06, 2012 2:47 pm 
Offline

Joined: Sat Dec 13, 2003 2:25 am
Posts: 4767
Location: Canada
Some guys I know change their crank length from road to TT, which seems to work for them (one won a World Elite ITT championship doing that), but I can't do it. They do not change the saddle position, just the crank length.


Top
   
PostPosted: Thu Dec 06, 2012 7:15 pm 
Offline

Joined: Sat Nov 03, 2012 7:08 pm
Posts: 21
Location: London
I've now installed the larger 175mm crank and tested it on the trainer. Position and power feels great and not like I need to change my saddle height. Looking forward to giving a proper (outdoors) test on the weekend.

If it is necessary to adjust saddle position I don't think it will be by much at all. Especially since you have some lateral margin of error to move forwards and back on the saddle.


Top
   
PostPosted: Thu Dec 13, 2012 11:08 am 
Offline

Joined: Fri Nov 21, 2008 11:23 pm
Posts: 228
Location: Mal Born, Oz.
I have an 88.5cm inseam and use 177.5mm cranks. For me it is relief just like getting in the drivers seat after a short arse drove before me and being all cramped up then shifting the seat back. I'm 179cm and ride a 54.5cm top tube and don't handle saddle setback at all.
The extra crank length also stopped my hamstrings cramping.


Top
   
Posted: Thu Dec 13, 2012 11:08 am 


Top
   
 
Display posts from previous:  Sort by  
Post new topic  Reply to topic  [ 9 posts ] 

   Similar Topics   Author   Replies   Views   Last post 
There are no new unread posts for this topic. Crank Length

[ Go to page: 1 2 3 4 ]

in Road

cyclespeed

51

1604

Wed Sep 07, 2016 7:16 am

cyclespeed View the latest post

There are no new unread posts for this topic. large giant tcr crank length?

in Road

tacostand

5

379

Mon Jan 18, 2016 10:04 pm

Alpine318is View the latest post

There are no new unread posts for this topic. Garmin with Di2 adjustment

in Training

wop

3

577

Mon Mar 28, 2016 12:50 am

chanthony91 View the latest post

There are no new unread posts for this topic. Rotor 3D+ adjustment nut bolt size?

in Road

alexhem

1

270

Sun Nov 01, 2015 2:01 am

kfreytag View the latest post

There are no new unread posts for this topic. Tune MAG 160 - bearing play adjustment

in Road

extralite

2

347

Fri Jun 03, 2016 9:38 pm

extralite View the latest post


All times are UTC+01:00


Who is online

Users browsing this forum: No registered users and 3 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:  
Powered by phpBB® Forum Software © phpBB Limited