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


Go Back   > >

Commuting Bicycle commuting is easier than you think, before you know it, you'll be hooked. Learn the tips, hints, equipment, safety requirements for safely riding your bike to work.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 06-30-09, 12:38 PM   #1
Ka_Jun
Who farted?
Thread Starter
 
Ka_Jun's Avatar
 
Join Date: Nov 2007
Location: Pittsburgh, PA
Bikes: '06 K2 Zed 3.0, '09 Novara Buzz V
Posts: 1,287
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Sigma 1200 wheel size chart question

http://www.sigmasport.com/en/allgeme...C_1200_nat.pdf

I'm running 26x1.95 tires.

26x1.9 - 1298
26x2.0 - 1313

so 26x1.95 should be 1305.5? Right? 1200 doesn't do fractions/decimal, so is it better to round up, or down?
Ka_Jun is offline   Reply With Quote
Old 06-30-09, 12:41 PM   #2
MNBikeguy
Senior Member
 
MNBikeguy's Avatar
 
Join Date: Mar 2007
Location: Minneapolis, MN
Bikes: 05 Trek 5200, 07 Trek 520, 99 GT Karakoram, 08 Surly 1X1
Posts: 1,834
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Unless you keep your tires digitally inflated at a constant pressure within a tenth, it doesn't matter.
MNBikeguy is offline   Reply With Quote
Old 06-30-09, 12:50 PM   #3
Ka_Jun
Who farted?
Thread Starter
 
Ka_Jun's Avatar
 
Join Date: Nov 2007
Location: Pittsburgh, PA
Bikes: '06 K2 Zed 3.0, '09 Novara Buzz V
Posts: 1,287
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
You would think, but I was running 26x1.5s and the same one way run came up as anywhere from 3.53 to 3.55 miles.

Using 1306, same run came out as 3.68 miles this morning.
Ka_Jun is offline   Reply With Quote
Old 06-30-09, 12:54 PM   #4
demoncyclist 
Senior Member
 
demoncyclist's Avatar
 
Join Date: Oct 2002
Location: Medway, MA
Bikes: 2011 Lynskey Sportive, 1988 Cannondale SM400
Posts: 2,689
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
The only truly accurate way is to do a rollout. Put something on the tire of the wheel with the sensor that will transfer a mark to the ground. Then ride the bike with the tires inflated to your preferred inflation pressure. Measure the distance between two marks, and that is your number (in mm).
__________________
DEMON

Satanic Mechanic
STAR 3 Spinning Instructor

2011 Lynskey Sportive (Shimano Ultegra 10s)
1988 Cannondale SM400 (Suntour XC-M 7s)
demoncyclist 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 01:13 AM.