speedo pinion gear

Posted By: stateroadhog

speedo pinion gear - 01/27/15 04:05 PM

okay according to chart with 4.10 gears and BF goodrich 275-60-15 tires that are suppose to be 28 inches tall I need a 38 tooth gear. When I actually measure tire I get 27.5. Again according to chart a 27 inch tire would use a 40 tooth. So I guess my question is would I use a 39? Thanks

Posted By: scratchnfotraction

Re: speedo pinion gear - 01/27/15 04:57 PM

when you type it in to the calculator in the archives it comes out 38.40 so a 38 gear is needed.

it shows tire size as 27.99

Posted By: mopar346

Re: speedo pinion gear - 01/27/15 05:09 PM

Use a 38 and check it against a measured mile, chances are you will be very close, rim width can change tire hiegth to a degree.