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Roll out calculation

Roll out calculation

Old 10-19-2003, 09:22 PM
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Ola,

What is the formula for Roll out again? Thanks.

Gary
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Old 10-19-2003, 09:28 PM
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tire diameter x pinion x 3.14 divided by spur
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Old 10-19-2003, 09:29 PM
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What about the internal ratio of the drive train? Where does it fit in? Thanks.
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Old 10-19-2003, 09:53 PM
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Sorry - I was thinking about 12th scale. Try this link

http://www.rcracing.com/Gear_Ratio_Program_1100.cfm
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Old 10-20-2003, 06:48 AM
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External Ratio = spur/pinion 128/29=4.41

Final Ratio = spur/pinion*internal drive ratio 128/29*1.77=7.81

Rollout = tire diameter*3.14/Final Ratio 63*3.14/7.81=25.32

This is for an XRAY EVO2 with optional 1.77 pulleys.

Hope this helps.

also check out this site: ARROYOC

Later,
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Old 10-20-2003, 11:33 AM
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tire dia X 3.14 divided by your final drive ratio = rollout
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Old 10-20-2003, 09:20 PM
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guys can anyone provide informaiton, whats the proper roll out for my monster pro? im using a 414M and the track is wide with lots of sweepers. tanx
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