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Post by captincvmn on Oct 30, 2020 21:58:28 GMT -5
I could use y’all’s input on the input to put in for the circumference of a 120/70-12 front tar. What rolling circumference have y’all used to make speed-o-meters work well?
Yes I could mark the tire, roll it ten revolutions on pavement, measure and divide by ten but it’s dark and cold and I wanted to ask.
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Post by scootercy on Oct 30, 2020 23:18:29 GMT -5
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Post by FrankenMech on Oct 30, 2020 23:34:35 GMT -5
The actual rolling circumference might be less with weight on it so you might want to enter a little less. It all depends on how close you want it to read. Speedometers are supposed to read a little fast.
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Post by 90GTVert on Nov 11, 2020 19:33:02 GMT -5
I'm a bit late, but if you go to my calculator's page you can find a tire size calculator as well as a speedometer correction calculator for dialing it in with the help of a GPS. www.49ccscoot.com/calculators.html |
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Post by captincvmn on Nov 11, 2020 20:13:21 GMT -5
I'm a bit late, but if you go to my calculator's page you can find a tire size calculator as well as a speedometer correction calculator for dialing it in with the help of a GPS. www.49ccscoot.com/calculators.htmlI started with Scootercy’s 1485 and adjusted from there using the BlackBox app for iPhone. I’m down to 1430mm/revolution and it reads even with the GPS app. It’s more depressing knowing I’m not as fast as I was but now I know my actual worth. |
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Petro
Scoot Enthusiast
Posts: 149
Location: Gothenburg, Sweden.
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Post by Petro on Nov 13, 2020 6:50:55 GMT -5
My Pirelli SL26 110/100/12 is almost spot on my scooter, 15% up in radius did the trick.
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Post by FrankenMech on Jan 12, 2021 22:43:27 GMT -5
One can also make sure your tire is aired up then have a buddy measure the distance from the ground to the center of the axle for the rolling radius while you sit on the scoot. Some calculations will get you close.
C = π(2r)
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