Dex210 spur gear and pinions
 

Hi I'm just seeing what's the best sizes to use with a 6.5T motor what size spur and pinion

Cheers

Depending on the track-size, with the standard spur (87t), 23t-25t pinion.

25 will be the largest you can fit on with the standard spur.

Dex210 spur gear and pinions
 

Hi I'm thinking about buying 9t motor for my car what would best spur gear & pinion for it I race on mixer off grass and astro!!

I have an 8.5t and I use 25/87 on carpet to move the motor forward. On astro and grass when it is wet or damp I use 23/81, the gearing is similar to 25/87 and it moves the motor further back for a bit more grip.