Is this sprocket too big for this wheel?

[patrickza]

It's for my outback mountain board. The wheels are 12.5" or 318mm diameter and the sprocket is 246.1mm in diameter. The rim is about 210mm in diameter I think, forgot to measure. Oh yes, the chain is a 05B chain but I'm not sure that maks much difference. The smallest I can get for my turnigy 130 is an 11 tooth, so if I can fit this 95 tooth on I'm smiling. The next size down would be the 76 tooth at 198mm diameter, it'll easily fit, but give me a 1:7 rather than the 1:8.6 I'd prefer.

Here is a cardboard cutout:

and the clearance:

So any thoughts or does this look like I'll make contact with the sprocket if I hit a bump?

 

[BiGH]

personally i wouldn't do it. The chain will also add a bit of diameter to this. if you got a flat, or simply didn't run enough air in your tyre you could be in a spot of bother.

And yes i'd be worried about bumps, breaking teeth on the sprocket, not to mention clearance of the tyre.

 

[vanilla ice]

The wheels are 12.5" or 318mm diameter and the sprocket is 246.1mm in diameter.

It doesn't need to lean right? How rough is the ground you cover? I think the terrain is going to determine if this 1.4" clearance will be enough. "Mountain" part of the name makes me think you go over rocks and stuff?