Smaller Rear Sprocket Needed for The Skyteam ST90

[The 26incher]

Does anyone know where I can buy a smaller rear sprocket for the Skyteam ST90? Is it the same as a CT70? Thanks for looking.

[PlanetMinis.com]

[T Bolt USA]

what about a bigger front

[firepower354]

Should be the same as a CT. What size do you need?

[The 26incher]

I've got a 17 up front now and I don't think I can go much bigger. I think I need a 31 or 33? I will have to check the size on my old CT because the size I had on it was about as small as you could go without cutting down the rear hub. Long story short, I think a 33?

[firepower354]

What motor? Will it pull that much gear? http://honda50.com/speedcalc/speedcalculator.html

I have 18t c/s sprockets on a couple of mine, and the shelf. Just needs a little grinding. No problem.



The Dr is out of 31's but has 32's

REAR_SPROCKET CT70_ATC70 TRX70_SL70 XL70_CL70 32_TOOTH 420_CHAIN_TYPE (251Y)

[The 26incher]

I just finished installing and jetting a xy150cc. I think the ST90 rear gear is a 36 or 38 not too sure but the engine pulls real hard. The speed-o reads 65mph now @ about 10 grand but I think it has much more...

[firepower354]

Yep, that 60mm stroke will pull a long set of legs. Try the Dr,unless you wanna go with an 18 up front. I can get a pic in the AM of a case modded for one.

[The 26incher]

I would love to see a pic of an 18 tooth up front. The 17 tooth I have right now is tight...

[firepower354]

I love the smell of angle-grinders in the morning...

[doopsx3]

run it...the chain will eventually make its own space.....lol

[nielspbr]

CT gears fit

30 no clearance issue

29 remove edge of dustcap

28 chain hits the hub.



One advice, replace the st90 rear hub with a honda(CT/ST/DAX)) rear hub and rubbers.

Reason, the circlip which holds on your rear sprocket sits straight in the aluminium of the hub and the aluminium ridge will break. With the honda hub the circlip is running in a steel groove.

[The 26incher]

Thank you Nielspbr! I have an extra ct70 rear hub that I will have to change out...

[brynbaily]

CT gears fit

30 no clearance issue

29 remove edge of dustcap

28 chain hits the hub.



One advice, replace the st90 rear hub with a honda(CT/ST/DAX)) rear hub and rubbers.

Reason, the circlip which holds on your rear sprocket sits straight in the aluminium of the hub and the aluminium ridge will break. With the honda hub the circlip is running in a steel groove.

Now can you replace the st90 hub with a honda CT bolt type hub? So you can use the bolt on sprockets? Mine is looking pretty shotty and I planned on changing it all over to a CT bolt style hub with all new sprockets and chain.

[tmas]

Now can you replace the st90 hub with a honda CT bolt type hub? So you can use the bolt on sprockets? Mine is looking pretty shotty and I planned on changing it all over to a CT bolt style hub with all new sprockets and chain.

The CT does not use a bolt on sprocket. It uses the same sprockets as the ZB and ST.

tmas