Author Topic: gear ratios (Read 1910 times)

Gadge · « **on:** November 24, 2007, 03:42:48 PM »

just looking on the axel gersil site and they do two crown and pinion sets one at 9/39 and one at 8/39, i'm a muppet when it comes to stuff like this but what would be the differance?

Maddog · « **Reply #1 on:** November 24, 2007, 04:31:49 PM »

8/39 is 4.975/1 and 9/39 is 4.33/1 so about 12% higher

50-mph with 8/39 will become 56mph with 9/39 at same rpm

however there is also a 41 tooth crown gear in the earliest aircooled.

my FSM did 82mph with the 9/39 gearing downhill and screaming its tits off

MaLi · « **Reply #2 on:** November 24, 2007, 04:35:01 PM »

Quote from: "Maddog"

8/39 is 4.875/1

Maddog · « **Reply #3 on:** November 24, 2007, 10:12:12 PM »

Quote from: "MaLi"

Maddog wrote:
8/39 is 4.875/1

did your mother never tell you it was impolite to point out other peoples mistakes

Richie