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Old 12-12-2011 | 10:28 AM
  #8435  
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Originally Posted by GuiltyByAssoc
What's the impact of changing the spur from 81 to 84 while leaving the pinion the same (at 22t)? more top end, loss of bottom end?
would be roughly the same as dropping one tooth on the pinion...

81/22 = 3.68~

84/22 = 3.81~

81/21 = 3.85~

it's not exact but in a pinch 3 teeth on the spur gear equals 1 tooth on the pinion..
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