Speedometer gear tooth count

redneck · Mar 25, 2010

I have 315 75 16 BFG KM2 tires that measure 34.8" in diameter and 4.56 gears should I get the 37 or 38 tooth speedo gear? Im right in the middle of the 2. My thought would be the 38 tooth so when the tires wear it will get closer. :dunno: Dose one tooth really make that much of a difference?

Doubleajaybrock · Mar 25, 2010

+1 for 37

M4Madness · Mar 25, 2010

37-tooth for sure.

nochance9 · Mar 25, 2010

My 35's with 4.56 gears read almost dead on with the stock speedo gear...

redneck · Mar 26, 2010

how many teeth are on the stock gear? Its hard to search on my blackbery.

nochance9 · Mar 26, 2010

I'm not sure, but every time i drive by one of those signs that give you your speed i'm within 1-2mph of it, did it twice a day all last week. I also like driving alongside those new civics that have the HUGE digital display cause i can match their speed look down into their cab and see what their speedo reads lol kinda gheto but hey it works.

M4Madness · Mar 26, 2010

redneck said:
how many teeth are on the stock gear? Its hard to search on my blackbery.

If it came stock with 3.55's, it had a 36-tooth speedometer gear. Each tooth is approximately 3%, which means each tooth is about 3 MPH at 100 MPH. At 50 MPH, you'd be half that (off about 1.5 MPH).

redneck · Mar 26, 2010

M4Madness said:
If it came stock with 3.55's, it had a 36-tooth speedometer gear. Each tooth is approximately 3%, which means each tooth is about 3 MPH at 100 MPH. At 50 MPH, you'd be half that (off about 1.5 MPH).

Perfect! One thing that I dont have to buy. No need to drop $60 for only being 3% off. Thanks!

Speedometer gear tooth count

redneck

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Doubleajaybrock

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M4Madness

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nochance9

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redneck

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redneck

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