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Old 01-05-2012, 09:30 PM   #1
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Default Stock gear ratio Dm spec 1e

Does anyone know the stock gear ratio for the ofna Dm spec 1e
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Old 01-07-2012, 05:01 AM   #2
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Does anyone know the stock gear ratio for the ofna Dm spec 1e
According to the on-line Ofna parts list it comes stock with a 13 tooth pinion and a 49 tooth spur (3.7) Don't know how accurate that information is on their web-site. Huck
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Old 01-09-2012, 02:38 PM   #3
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Does anyone know the stock gear ratio for the ofna Dm spec 1e
It is 13 and 49.


The differential ratio is 3:30 to 1
43t and 13t
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Old 01-11-2012, 05:22 AM   #4
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It is 13 and 49.


The differential ratio is 3:30 to 1
43t and 13t
Wondering if Ofna changed some gearing?...this is from the Ofna Racing site showing pictures and details and this is the last one down the line:" 43 Tooth Ring & 13 Tooth Pinion Gear (3.30:1)" Maybe I don't understand what the "differential ratio" is of 3:30 to 1,(43t and 13t). Can someone explain for me? Thanks,Huck
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Old 01-11-2012, 10:31 AM   #5
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The manual shows that it is a 43T spur and a 13T pinion.

Looking further down in the parts section, it shows a 13T bevel shaft pinion and a 43T bevel diff ring gear.

The FDR (Final Drive Ration) is as follows:

FDR = (Spur / Pinion) X (Ring gear / shaft pinion)

= (43 / 13) X (43 / 13)

= 3.3 X 3.3

= 10.6
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