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Buddy of mine wants to gear down his 12 pro. We have an 18 tooth gear to throw in which = 18:42. Should make 2.33 if I'm correct. Will this work or is that going to run the chain too loopy if that makes sense?
18:42 gears on a 12 pro?
- Thread starter doc202
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18's aren't overly chain friendly.... pick your target ratio and use the largest drive (upper) gear possible to get close to it.
I personally will not run a gear smaller than a 20 Tooth on the top; and even then it has to be a billet machined gear and not a powder metal sprocket.
I've had way too many small powder metal sprockets frag on me and take out the case at the most inopportune times.
My recommendation would be a 20/46 for a 2.3 ratio or a 20/47 for a 2.35 ratio; the 47 Tooth is quite hard to find but it will fit the case. I did not calculate the chain pitch for either one as all my sleds are all custom C3 belt drives these days.
My track speed of choice is 75-80 MPH (on a stock or near stock sled). That track speed allows you to effectively use all of the clutches, which lowers belt temps and prolongs their service life by 3-5 times as a rule.
I've had way too many small powder metal sprockets frag on me and take out the case at the most inopportune times.
My recommendation would be a 20/46 for a 2.3 ratio or a 20/47 for a 2.35 ratio; the 47 Tooth is quite hard to find but it will fit the case. I did not calculate the chain pitch for either one as all my sleds are all custom C3 belt drives these days.
My track speed of choice is 75-80 MPH (on a stock or near stock sled). That track speed allows you to effectively use all of the clutches, which lowers belt temps and prolongs their service life by 3-5 times as a rule.
We have 3 pros in our group that have been running 18-44 gearing for 2 years now and none of them have had any issues. I agree that it's better to run bigger gears to get the same ratio but I'm pretty sure you'll be just fine using what you have.
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I've lost a chain / case over an 18 personally, won't do it again. Just my experiences!!!
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Thanks guys. Thought that might be the case. Tempting when you have a gear in hand though 
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