|
tire size and odometers
Hi there,
I'm new here, and this is my first post. I have a Nirve Wilshire (ladies). Nirve Ladies Wilshire City Bike from Big Time Cruisers The tires are 700c x 35. I just bought a Schwinn odometer, and I am trying to set the wheel size to get proper milage/speed. They do not list 700c x 35 as a size on their chart. They have 700 x 25, 28, or 32. I don't know what to do, Can someone help me? |
Originally Posted by Bulldogge
(Post 17473791)
They do not list 700c x 35 as a size on their chart. They have 700 x 25, 28, or 32. I don't know what to do, Can someone help me?
|
A stickler for accuracy sits on the bike and rolls along the sidewalk, while a friend with chalk measures the distance covered in one revolution of the front tire. Some computers require the distance in millimeters, others prompt for centimeters, IME.
|
uh-oh
Originally Posted by Bezalel
(Post 17473808)
Usually there's a simple formula. What numbers do they have for the listed sizes?
|
I've got a tape that measures in cm. Inches would also work with conversion by one of a multitude of conversion programs or methods.
I set the valve at 0, then slowly roll my tire forward till the valve is down again. Do it a couple of times, and you have your speedometer/odometer perfectly calibrated to your bike and tire. I round to the nearest half cm, I usually walk my bike with a little weight on it, but I don't know if that is absolutely necessary. |
Do a rollout! :thumb:
|
There is variance between different tires of the same size. Not all 32's will measure the same. I always do the roll out method described by others above, while leaning down on the handle bars to simulate riding weight. I guess that makes me a stickler for accuracy.
|
Originally Posted by Bezalel
(Post 17473808)
Usually there's a simple formula. What numbers do they have for the listed sizes?
Originally Posted by LesterOfPuppets
(Post 17473858)
A stickler for accuracy sits on the bike and rolls along the sidewalk, while a friend with chalk measures the distance covered in one revolution of the front tire. Some computers require the distance in millimeters, others prompt for centimeters, IME.
Originally Posted by Bulldogge
(Post 17473909)
OK, the literature was wrong. I went down to the garage and looked on the tire, and it is 700c x32, (NOT 35) which is listed on the chart. Thanx guys! Should work now.
Originally Posted by CliffordK
(Post 17473919)
I've got a tape that measures in cm. Inches would also work with conversion by one of a multitude of conversion programs or methods.
I set the valve at 0, then slowly roll my tire forward till the valve is down again. Do it a couple of times, and you have your speedometer/odometer perfectly calibrated to your bike and tire. I round to the nearest half cm, I usually walk my bike with a little weight on it, but I don't know if that is absolutely necessary.
Originally Posted by ThermionicScott
(Post 17473966)
Do a rollout! :thumb:
Originally Posted by AlmostTrick
(Post 17473976)
There is variance between different tires of the same size. Not all 32's will measure the same. I always do the roll out method described by others above, while leaning down on the handle bars to simulate riding weight. I guess that makes me a stickler for accuracy.
|
Originally Posted by CliffordK
(Post 17473919)
I've got a tape that measures in cm. Inches would also work with conversion by one of a multitude of conversion programs or methods.
I set the valve at 0, then slowly roll my tire forward till the valve is down again. Do it a couple of times, and you have your speedometer/odometer perfectly calibrated to your bike and tire. I round to the nearest half cm, I usually walk my bike with a little weight on it, but I don't know if that is absolutely necessary. |
Or just find the local taxi and police measured mile. Ride it a few times noting the pre or post wheel rotations to catch up/slow down so that both the odometer and the mile stop points are recorded and averaged. Then do the math for the difference and correct the computer calibration.
I did this a few times one year and found the same bike (and tires) had different results... There's something to the simplicity of believing in side walls and a chart:) Andy. |
| All times are GMT -6. The time now is 03:40 AM. |
Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.