Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Touring Have a dream to ride a bike across your state, across the country, or around the world? Self-contained or fully supported? Trade ideas, adventures, and more in our bicycle touring forum.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 01-28-08, 05:13 PM   #1
chainlife
Junior Member
Thread Starter
 
Join Date: Sep 2007
Bikes:
Posts: 17
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
crank length?

ok, first thank you for your advice!
-I'm building a frame up Cross check 56cm for touring and towny bike. although i haven't yet bought the frame i have been sized on a 56cm CC. i have a fist of seatpost prutuding from the frame and the seat to handle bars is level. Which i like. BUT WHAT IS THE RECOMMENDED LENGTH FOR TOURING BIKES? 170-175 WHAT CRANKS WOULD YOU RECOMMEND? LOOKING FOR TRIPLE, STIFF, AND DURABLE
chainlife is offline   Reply With Quote
Old 01-28-08, 06:05 PM   #2
rwp
Senior Member
 
Join Date: Jul 2007
Location: Reno, NV
Bikes:
Posts: 400
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Generally tall people use 175mm and shorties get 165mm cranks. If you're in between, start with 170. If you have an average cadence, that's it. If you like to spin fast, you may consider adjusting to a slightly shorter crank. Likewise, if your cadence is slow, a slightly longer crank is warrented. Just keep in mind that +/-5mm doesn't make that much difference.

Things to consider:
1) make sure your crank matches the bottom bracket. Isis vs. square taper vs. whatever. This sounds obvious but consider how embarassed you'd be if you started to put it together and found you had incompatable parts.
2) Choose the bolt circle diameter (mountain, compact or road) so that you have a good choice of chainring sizes to match your riding style with your rear cluster.
3) Choose the proper bottom bracket length. I wont get into discussing chainline. Here's a good explanation. http://www.sheldonbrown.com/gloss_ch.html#chainline

I use a Sugino XD series crank. Reasonable quality at a reasonable price.
rwp is offline   Reply With Quote
Old 01-28-08, 06:06 PM   #3
Speedo
Senior Member
 
Speedo's Avatar
 
Join Date: Jun 2006
Location: Boston Area
Bikes: Univega Gran Turismo, Guerciotti, Bridgestone MB2, Bike Friday New World Tourist, Serotta Ti
Posts: 1,998
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Stop now before you drive yourself crazy! Pick a random number between 165 and 175. Choose that crank length.

Speedo
Speedo is offline   Reply With Quote
Old 01-28-08, 10:12 PM   #4
jaypee
succumbs to errata
 
jaypee's Avatar
 
Join Date: Jul 2004
Location: WI
Bikes:
Posts: 741
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Remember that the shorter the crank, the less your knee has to flex through each rotation, this may be important if you have knee issues.

I was having minor knee discomfort on longer (50+ mile) rides using 175's. I switched to 170's (Sugino XD's) and couldn't be happier. Also keep in mind that if you choose a shorter crank, you may want to adjust your gearing to compensate.
jaypee is offline   Reply With Quote
Old 01-28-08, 10:13 PM   #5
acantor
Macro Geek
 
Join Date: Nov 2003
Location: Toronto, Ontario
Bikes: True North tourer (www.truenorthcycles.com), 2004; Miyata 1000, 1985
Posts: 1,254
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
If you want to be obsessive about it, google around. You will find plenty of rants on optimal crank lengths, historical data about the crank lengths preferred by winners of the Tour de France, formulas for determining the ideal crank length, and so on, ad nauseum.

Or you can just take Speedo's sage advise, or apply rwp's sensible rule-of-thumb, make your choice, and never give the subject another thought!
acantor is offline   Reply With Quote
Old 01-29-08, 10:55 AM   #6
seeker333
__________
 
seeker333's Avatar
 
Join Date: Feb 2004
Bikes: yes!
Posts: 3,168
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 26 Post(s)
http://www2.bsn.de/Cycling/ergobike.html
seeker333 is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 04:22 PM.