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Old 05-25-2016, 10:38 AM
  #1252  
Rodarbal
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Originally Posted by phq2
This is probably the hundredth time being asked but I'm new to tamiya, just picked up a tb04r and waiting for its arrival. I plan on running it in vta 25.5 class, can someone tell me or have a gearing chart to get a 4.0 fdr? Pinion and spur size. Also spare parts that are good to have on hand? Thank you for the wisdom in advance
The drive ratio of the chassis is 2.5:1. In VTA, I ran a 3.46:1 FDR (larger, asphalt layout). To get that I ran a 72T spur and a 52T pinion (64P).

(72/52)*2.5 = 3.46 FDR

To get your 4.0:1 FDR with a 72T spur:

(72/4.0)*2.5 = 45T pinion
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