11 tooth VS. 10 tooth sprocket

Aaron Witzke · Joined: 11 Oct 2012 Posts: 27

My kart has a 10 tooth front sprocket. To match the rec. gearing for my local track (11/84) it would require a 76/77 rear. Is there any benefit going either way? Running a smaller rear would I *guess* have less rotational weight, although not by much. At this point I have to either get an 11 tooth front (have all the right rears) or buy a 76/77 rear as the ones I do have don't go that low. Thoughts?

jeff grose · Posted: Tue Nov 06, 2012 12:55 pm Post subject:

84 is a larger gear correct? smaller gear 76/77 would be better in case you happen to run off track, if you see where i'm going with this
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TJ Koyen · Joined: 03 Oct 2004 Posts: 1420

No performance difference between them.

A larger front will wear less though, and be less likely to break.

I would try to stay under 87 or so on the rear teeth otherwise you risk scraping it on the track if you drop a wheel or something. If you need to run a 10 on the front to get the ratio right and keep your rear gear a reasonable size, it's no issue at all.
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Jim Derrig · Posted: Tue Nov 06, 2012 5:38 pm Post subject:

There is no performance difference. The 11-tooth sprocket is easier on your chain as it doesn't have to wind around such a tight circumference. Pretty much everyone at SIMA runs an 11-tooth, probably for that reason (I don't 'cause as a masters class driver I run a stiffer gear). The curbs and edging on the track are pretty gentle, so damaging the bigger rear sprocket is not a big issue, at least at size 84. Remember that to keep the engine in the same place you have to change chains when moving between 11-tooth and 10-tooth set ups.

Patrick Hubbell · Posted: Mon Nov 12, 2012 11:49 am Post subject:

I prefer an 11 tooth dive gear from a reliability standpoint. If you look at the wall thickness of a 10 tooth drive gear sprocket it is thiner compared to an 11 tooth. You can run a 10 tooth gear for a coule of races but beyond that you risk shearing off the sprocket. The 11 tooth has just enough extra material to prevent shearing. I would say an 11 tooth is the minimum especialy for higher horse power applications.
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Carl Beavers · Posted: Mon Nov 12, 2012 9:36 pm Post subject:

+1