Posted By: CJK440
Speedo gear needed - 01/09/09 04:19 PM
I have a 27" tall tire and 3.73 gears. What speedo gear should I use. The archives show 3.55 and 3.91 only of course.
Posted By: RapidRobert
Re: Speedo gear needed - 01/09/09 04:25 PM
You might put a piece of flat stock on top of one of your rear tires & measure the EXACT distance to ground. Tire mfr listed heights are usually not dead on accurate & this could tip you one way or the other on which pinion gear to select.
Posted By: 446acuda
Re: Speedo gear needed - 01/09/09 04:32 PM
If tire is slightly less than 27" go with 37 tooth, if slightly more than 27" go with 36 tooth. If it is exactly 27" it would be a toss up between the two.
Posted By: NachoRT74
Re: Speedo gear needed - 01/09/09 06:25 PM
simply 36 tooth... no more no less
Posted By: CJK440
Re: Speedo gear needed - 01/09/09 06:33 PM
Tire is actually supposed to be 26.8. Its a G70-14.
Posted By: RapidRobert
Re: Speedo gear needed - 01/10/09 10:08 PM
If the circumference dimention makes a more accurate read for this then I will start doing that & not recommending checking the height. I did use the piece of stock to get the height on my 65 dart to select the pinion gear & it's dead on but yeah the stackup of tolerances as in the tire dimention may have just worked out in my favor in this case.