Island Radio Operated Car Club

Racing Topics => 12th Scale Racing => Topic started by: BCbud on October 05, 2021, 06:50:03 PM

Title: Gearing
Post by: BCbud on October 05, 2021, 06:50:03 PM

Good day!

Could some one give ma a starting point for gearing for 17.5 motors ( pinion and spur )?

Thanks, Neil.

Title: Re: Gearing
Post by: Blake on October 06, 2021, 03:31:05 AM

Quote from: BCbud on October 05, 2021, 06:50:03 PM

Good day!

Could some one give ma a starting point for gearing for 17.5 motors ( pinion and spur )?

Thanks, Neil.

Hi Neil,

A rollout of 85mm is a good starting point.  Something like this would work:

(43mm tire x 3.14 x 45t pinion) / 72 = 84.4mm rollout

Blake