apex gear

[Rove44]

does anyone know what number tooth gear is on the bottom i was told if i went one bigger i would get a little more pull. Just not sure what gear to buy

 

[Rove44]

somebody must know this.

 

[Blue Dave]

Rove,

You can usually find what you need by using the search function. Here is a good thread on gearing.

http://www.ty4stroke.com/viewtopic.php? ... ar&start=0

Instead of increasing the lower gear by one tooth I reduced the top gear by one tooth which has a greater effect and the top gear is less expensive to change.

 

[07 GT]

The bottom gear on an apex is 38 tooth. The top gear is 24 tooth. Which equals a 1.58 gear ratio.

By changing the top gear to a 23 tooth, you gear ratio would be 1.65.

BTW on the Attak the top gear is 23 tooth already.

 

[sniperviper]

22/38 on 07 - 08 and probebly 09 apex rtx

 

[Blue Dave]

22/38 on 07 - 08 and probebly 09 apex rtx

Not sure if you guys in Norway get something different but here in the US our Apex is 24/38 for short track and 23/38 for the long track.

 

[BigMac]

From the service manual...

 

[rxrider]

22/38 on 07 - 08 and probebly 09 apex rtx

Not sure if you guys in Norway get something different but here in the US our Apex is 24/38 for short track and 23/38 for the long track.

Blue Dave
Apex RTX 24/38 '06
Apex RTX 22/38 '07-'09
Attak 23/38 all years
Apex GT and ER 24/38 all years

rxrider

 

[SledFreak]

22/38 on 07 - 08 and probebly 09 apex rtx

Not sure if you guys in Norway get something different but here in the US our Apex is 24/38 for short track and 23/38 for the long track.

Blue Dave
Apex RTX 24/38 '06
Apex RTX 22/38 '07-'09
Attak 23/38 all years
Apex GT and ER 24/38 all years

rxrider

This is correct..

 

[Shivesy]

If you go the next size bigger on the bottom it would be a 40 tooth.

 

[LazyBastard]

Only if you have a problem with addition though... 38+1=39.

 

[Shivesy]

Do they make a 39 in reverse?

 

[rxrider]

Yes they do

Part#s for a '06 Apex ER

2 8FB-47587-80-00 SPROCKET, CHAIN DRIVEN (38T) UR 1
2 8FB-47587-90-00 SPROCKET, CHAIN DRIVEN (39T) UR 1
2 8FB-47587-00-00 SPROCKET, CHAIN DRIVEN (40T) UR 1

 

[Lammy]

So I just got an 06 RTX, would it be beneficial to go to a 23? Kinda sounds like it. I'd loose a little top end (not that I care), but gain a little bottom, and mid? Correct? The smaller the top gear, the more bottom end, correct? And is the 23 kinda a comfy medium then? Or just kinda works better in general?

 

[rxrider]

Yes you are correct, even a 22 would do fine but then you would have to change the chain as well, from a 70 link to a 68 link. With a 23 top gear you would NOT have to change the chain.