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The mountain goatiest gearing combo I remember reading about someone using on here was 12-72. Check out the gearing commander sites for the % of change, a couple are stickies somewhere...maybe in the Tech Write-up section.
 

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Captain, I have 2 Tw's set up with 12/55. They are Mountain Goats for sure.
I now most of the time start out in second gear unless I'm on a up hill. That makes first gear like a granny gear.
Top cruising speed is probably about 35 mph. But they will go 45 mph if needed.
I did not have to change or bend anything everything fit great,
I did buy new chains when I bought my Sprockets.
 

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Captain, I have 2 Tw's set up with 12/55. They are Mountain Goats for sure.
I now most of the time start out in second gear unless I'm on a up hill. That makes first gear like a granny gear.
Top cruising speed is probably about 35 mph. But they will go 45 mph if needed.
I did not have to change or bend anything everything fit great,
I did buy new chains when I bought my Sprockets.

I run the stock front and a 72 rear from Sprocket Spec. I'm 6'4 and 220. I use the bike mainly for hunting and technical single track here in Utah and Idaho. For slow steep mountain single track riding you can't do any better in my opinion. I also have a TW with stock front and 60 rear but when the going gets technical and steep above 9K feet the 72 rear is my go to bike....
 

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Personally, I don't think I would go to a 12. It's just so tight of a radius and more stressful on the chain and will probably wear out faster.
 

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Any advance on 90 - last call Ladies and Gentlemen - we have 90 bid - do I hear 92 ......
 

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But would the rear tire even have any traction to use the newly available stump pulling torque? What kind of hill do you plan to attack at max RPM, 3 mph in first gear?

Unless you intend to enter it into tractor sled pulling contest?
 

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so ive ran 12 55 for years and I can answer a few questions for you. 12 tooth sprockets do indeed wear faster and going beyond a 55 tooth is not likely to make a better bike for you as you do most of yo u r hill climb g in second gear. also larger than 55 tooth is go I ng t o cost a lot of money and made of aluminum so wears very fast. also even 12 55 is not really useful on a road yo u r cruuise speed might be only 35 mph. if yo u go to 7 0 tooth yo u re go I n g to be s I significantly slower than that.

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