yeah yeah another gear question

[erinehart5001]

this is a good one for you gear heads. i recently changes the front gear to a 16t, which of course threw my speedo off, dont know how much but is a noticable difference. here is the question, since going down one in the front is like going up three in the back, if i go up three in the back wouldnt that fix the speedo problem??

seems like it would,

thanks
eric

 

[Burger King]

Just get a speedo healer. Then you can correct the speedo no matter what gearing you are running.

 

[erinehart5001]

yeah but if i get an accumen gear indicator, it wont work, plus i would like a little more tq

 

[cougar694u]

No, you'd have to go -3 in the rear, thus negating any gain from your -1 up front. Estimate 10% right now. If you're speedo says you're doing 70, you're probably closer to 63. (70 x 0.9 = 63). If you want to go 70, go about 77 on the speedo (70 x 1.1 = 77).

Why will the gear indicator not work with a speedo healer. They're separate systems & wiring and don't really affect one another.

 

[erinehart5001]

ohhh whoops, lol sorry, i was thinking of the tre,

my bad, lol

thanks
eric

 

[Burger King]

I'd go with the GIPRO gear indicator red or blue display with built in smart switchable TRE.

The GIPRO and the Speedohealer are both plug & play.

 

[SpeedGeek]

With the stock setup 17/40 and the factory speedo off by 6.5%, your new gearing of 16/40 and factor in the factory error, your speedo is currently off as follows:

Total Speedo Error 14.4 %
Total Odo Error 7.4 %

If you add 3 teeth to the rear it is going to be off even more and be closer to:
Total Speedo Error 23 %
Total Odo Error 15.5 %

This was calculated on Speedhealer website and is generally pretty close. I found mine with 16/42 to be off

Total Speedo Error 19.8 %
Total Odo Error 12.8 %

So I calibrated my speedohealer at -16.5%. This should help you figure out approximately how far off you will be with different gearing changes:

Speedohealer Calculator