Help finding large T8F sprockets

B

Bear

New Member
Please help if you can, I have a tri stud mounting pattern 33mm (1.3 inches) centre to centre. I cant find anything over 74 teeth.

Ideally I would want 80-90 teeth. Searched for hours :-(
 
I just googled T8F, and it seems that its related to scooters and mini-bikes mostly. Not to be rude, but this is not a scooter/mini-bike forum. It is a forum for motorized bicycles. Most of the information that is exchanged here is related to installing engines to pedal bicycles.
 
thanks bbb, I have a stand up motorised scooter but will be doing a 4 stroke 70cc mountain bike up shortly. I asked here because i didnt relise bikes dont use this chain. do u know a good place to get a custom sprocket made? thanks
 
I cant advise you on anything that doesnt relate to bicycles or the motorizing thereof, not because I dont want to, but simply because my range of mechanical knowledge begins and ends with motorized bikes. I can suggest one possibility, but I cannot guarantee the results. visit www.mmbikeparts.com and get in touch with the folks there by phone or email. Tell them what you need, and they will be able to tell you if they can do it or not. If they can't help you, I cant tell you where else to look, because I dont know. Good luck.
 
bigbutterbean said:
I just googled T8F, and it seems that its related to scooters and mini-bikes mostly. Not to be rude, but this is not a scooter/mini-bike forum. It is a forum for motorized bicycles. Most of the information that is exchanged here is related to installing engines to pedal bicycles.
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On my Scooterguy center-mounted engine, I use 11t T8F sprocket on the transmission to a 72t chainring. With an 8 speed cassette, it allows me a granny gear of 46.36:1 and final drive of 15:1. If I had used bicycle sprockets, my first gear would've been 28.33 (my present 3rd gear) and an unusable 9.2:1 final drive.:-||
 
Bear said:
Please help if you can, I have a tri stud mounting pattern 33mm (1.3 inches) centre to centre. I cant find anything over 74 teeth.

Ideally I would want 80-90 teeth. Searched for hours :-(
Click to expand...

Without ordering custom sprockets, you'd have to switch to #25 chain and sprockets. They have the 3-hole bolt pattern too. ScooterParts4Less website has 78t sprockets for $12. Davesmotors.com has 98t sprockets for $24. For strength and simplicity, a custom T8F might be the right choice. I like the fact that they are smaller in diameter than regular bicycle chainrings. They also allow for awesome gearing. My first gear is 46.36:1, which is great for very steep hills. Good luck.

What final drive are you shooting for? What size is your engine sprocket?
 
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