Tire size conversion help
09-16-08 | 03:14 PM
#1
Thread Starter
Newbie
Joined: Aug 2008
Posts: 3
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Bikes: Trek 7.2 FX
Tire size conversion help
Hi everyone, I'm a newbie biker, and I just bought myself a new computer (even managed to install it with no problems!). I'm trying to figure out what my wheel factor is.
I have a Trek 7.2 FX and it says that I have a wheel size of 700 X 35C. The data point I need to enter is the wheel factor, or the distance in millimeters per one turn of the wheel. Per the instructions, a 700 X 32C has a wheel factor of 2155, so I'm assuming that it will be just a bit higher than that. Any help would be greatly appreciated.
I have a Trek 7.2 FX and it says that I have a wheel size of 700 X 35C. The data point I need to enter is the wheel factor, or the distance in millimeters per one turn of the wheel. Per the instructions, a 700 X 32C has a wheel factor of 2155, so I'm assuming that it will be just a bit higher than that. Any help would be greatly appreciated.
09-16-08 | 03:34 PM
#2
Mad bike riding scientist
Joined: Nov 2004
Posts: 29,152
Likes: 6,209
From: Denver, CO
Bikes: Some silver ones, a red one, a black and orange one, and a few titanium ones
Hi everyone, I'm a newbie biker, and I just bought myself a new computer (even managed to install it with no problems!). I'm trying to figure out what my wheel factor is.
I have a Trek 7.2 FX and it says that I have a wheel size of 700 X 35C. The data point I need to enter is the wheel factor, or the distance in millimeters per one turn of the wheel. Per the instructions, a 700 X 32C has a wheel factor of 2155, so I'm assuming that it will be just a bit higher than that. Any help would be greatly appreciated.
I have a Trek 7.2 FX and it says that I have a wheel size of 700 X 35C. The data point I need to enter is the wheel factor, or the distance in millimeters per one turn of the wheel. Per the instructions, a 700 X 32C has a wheel factor of 2155, so I'm assuming that it will be just a bit higher than that. Any help would be greatly appreciated.
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Stuart Black
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Stuart Black
Dreamin' of Bemidji Down the Mississippi (in part)
Plan Epsilon Around Lake Michigan in the era of Covid
Gold Fever Three days of dirt in Colorado
Pokin' around the Poconos A cold ride around Lake Erie
Dinosaurs in Colorado A mountain bike guide to the Purgatory Canyon dinosaur trackway
Solo Without Pie. The search for pie in the Midwest.
Picking the Scablands. Washington and Oregon, 2005. Pie and spiders on the Columbia River!
09-16-08 | 04:46 PM
#3
Really Old Senior Member
Joined: Feb 2007
Posts: 14,636
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From: Mid Willamette Valley, Orygun
Bikes: 87 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds. 2019 Giant Explore E+3
Your tire diameter would be 6MM more, so that times PI would be about 19MM more.
I just "lasso" my tire with a string, and measure the string.
Even if you are off by "a few" MM, remember that's in over 2000 units. 20 "parts" off is only 1%, which is far more accurate then your car!
I just "lasso" my tire with a string, and measure the string.
Even if you are off by "a few" MM, remember that's in over 2000 units. 20 "parts" off is only 1%, which is far more accurate then your car!
