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Old 08-28-09, 02:46 PM   #1
trobinson017
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Just saying Hi!

Hi all! Just found bikeforums.net. Great site! I'm a long time avid recreational and commuter cyclist. I've done a few of those MDA type charity rides but no serious touring. I currently ride a 1996 Cannondale H300 hybrid that I bought new. It's been my primary bike for 13 years. It's been a terrific bike for commuting (27 miles roundtrip), recreational toodling and fitness riding. I love it!

Believe it or not, it's had the original tires until today! (which is why I'm here). IRC GripGlides to be exact. 700x38c. Great all-around tire. The Florida humidity just took its toll on them. So today I discovered a bike shop I hadn't heard of and went to check out their tires. Turns out they are going out of business and everything was 50% off. Not much left but they just happened to have two Kenda KWEST 700x35c tires @ $27 each. I got both for $26! Sweet!!

So my question is, my cyclocomputer is currently calibrated for the old 700x38c tires. Do I need to do another roll-out to get a new circumference or is the difference between 38c and 35c minor enough to just leave the settings as they are? By the looks of the computers' documentation which includes a chart, the difference appears to be negligible.

I look forward to some good cycling community involvement here!

Tim
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Old 08-28-09, 02:52 PM   #2
kenkayak
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You will find it easy getting involved here Trobinson017 Welcome/Kenneth
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Old 08-28-09, 02:55 PM   #3
sh00k
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since your change is so minor, the new speed readings will not be 100% accurate but it all depends on how accurate you want them to be.

if you are really picky and want to know what your exact speed is, definitely remeasure and recalibrate the computer for the new measurement. since it's such a negligible change, however, I personally would leave the computer as-is.
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Old 08-28-09, 02:58 PM   #4
MattyA
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Welcome. I believe you will need to adjust your computer since the circumference of the tire will be different. You can do a roll-out...or just use a table if you are lazy like me.
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Old 08-28-09, 03:18 PM   #5
trobinson017
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Originally Posted by kenkayak View Post
You will find it easy getting involved here Trobinson017 Welcome/Kenneth
Thanks for the welcom, Ken! I like your username. I kayak as well in a Janautica Anadyr 17' fiberglass sea kayak.

Happy pedaling/paddling! (pedaddling??)

Tim
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