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I have a 72 tooth sprocket coming to me from Sprocket Specialists but they were all out of the 14 tooth front. This has me thinking that maybe I should consider a 13 or 15 tooth instead and wanted to field some opinions. I'm wanting to build a climber, I wont be going more then 25 mph so top speed isnt an issue.

Secondly could someone recommend a chain link size for me, i see alot of TW sites selling 130 link kits but dont want it to be too short for such a large rear sprocket.
 

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Yes, a 13 or 15 front sprockets will work. I've been using a 13T front sprocket with the various rear sprockets throughout the year (50, 55, 60). I've ordered my 13T front sprocket either from eBay or Amazon I can't remember which, listed for a TW.

It came with a spring clip


instead of the bolt retainer you see on the stock 14T sprocket.


You can get a 14T from Rocky Mtn ATV/Motorcycle for $10.74 (3 in stock). If you order it today you'll probably get it tomorrow. 99% of the parts I order from them I get the next day unless I order on a Friday or Saturday.

https://www.rockymountainatvmc.com/oem-schematic/4

The closest I could get to how long of a chain was using this calculator which only went as high as 13/65 = 152 links. I suspect you'll need more so you'll probably have to buy two chains and cut & splice to get the links you'll want.

Sprocket Calculator - the easy motorcycle sprocket and chain calculator

I've heard of at least 2 forum members who've used a 70 or 72T rear sprocket but I can't find any info using the forum or google search functions.
 

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72 tooth? A 50 comes stock. You must get extra traction turning left with that sprocket. A 14 front and 50 rear comes stock and I think that is way too low for my 260lbs. I switched out for a 15t and 47t option on mine. With a 72 tooth rear you must top out at about 40 mph. Yea!, I would say to go to a 13t front if you want to be in 3rd before you get to 10mph. and if you truly have a 72T rear you will need at least 142 links.
 

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I've run as high as 15-44 and as low as 14-65. As he states; he doesn't plan on doing more than 25 mph. You wouldn't be able to go where he is going; and he won't be able to keep up with you where you ride. But you each will have a great time on such a diversely set up machine. Ain't it wonderful!
Yeah - it’s amazing what these little monsters can do. You can have a tractor that will climb the side of your house one day, and a street ripper the next day with a couple of sprockets and and a handful of tools. The only thing you can’t do is run 75 on the interstate. At least not for long.
 

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Just so you will know what that 72 tooth rear sprocket will look like on your TW, here are a couple of pics of JMPNFSH's bike when we fitted his chain at a Wrench & Ride a couple of years ago. He was planning on riding the Rubicon Trail with this setup. I don't remember what size his smaller sprocket was, but you can see the section of chain that was added for the larger sprocket.



 

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If you don't care about Top Speed go with a 13 tooth Front and the 70 or 72 Rear. I run a 72 Rear on one bike with a 14 Front. Cruises at 30 mph with the 35 mph burst at times. Only major problem with that large of sprocket is it gets hung up during river crossings and deep mud bogs or deep muddy ruts pack the chain with mud. It will climb like a goat. You can crab walk that bike anywhere..
 

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BTW my other TW is running a 13 Front and either a 60 or 62 Rear which is about as big in the rear as you can go and still use the OEM chain guard. With the rear OEM tire I think this gear ratio is low enough for Elk hunting in Utah between 7K-10K single track carrying my 220lb plus gun and gear in Most (Not All) situations but again if speed and the OEM chain guard are not an issue go with the 72 Rear or maybe all the way to 13/72. When the going gets steep, technical, rocky and muddy at high elevations low gearing is the way to go and I have always been thankful I had it. Remember a carb engine loses about 5% of its HP & TRQ every 1K above sea level and the TW doesn't have much to start with......
 
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