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Old 02-21-2013, 06:56 PM
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Default 01 CR250 gearing

     

hey guys just wondering, right now i have a 13/52 gearing on my 01 CR250 im wanting to race harescrabmles is this setup good? if not what is a good setup and a good brand.
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Old 02-21-2013, 08:00 PM
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Dont really know as gearing is all over depending on desired speeds and everything else. I love Renthal sprockets..
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Old 02-21-2013, 08:28 PM
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Ok, I would say that gearing should be about right. a 13/52 yields a 4:1 ratio and I shoot for about a 3.7:1 for mx.

Paw Paw
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Old 02-21-2013, 09:48 PM
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13/52 sounds a bit low to me for a hare scramble. I think you may find your self tapped out in 5th on the faster sections. I run 13/50 on my CR250 for MX. Seems you'd want to be geared higher for a hare scramble but depends on how many fast sections the course has.
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Old 02-23-2013, 10:58 PM
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Ditto the above post. I ran a 13-52 for a couple years of enduro. I ran out of gear in the road sections and was getting to much wheel spin out of the corner. I was steering to much with the rear wheel. I went to a 13-50 last year for one race and found it much more to my liking. I was less tired and overall the roll on was better. But then again I"m 56 and getting a little long in the tooth. A younger person may not have that problem. Too bad the engine took a pooper two weeks later and I"m just getting it back together.
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Old 02-24-2013, 02:55 AM
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14 and 52 is a common size on my son's bike for fast woods. with the rekluse clutch on it we could go quite a bit higher, but then again, you may not need top speed as much as you need a low gear that lets you crawl around a little better.

i would rather err on the side of being too low the first time out, because slipping the clutch, killing the engine, falling over, stalling etc is probably worse than having to give up some top speed. just be smart about overwinding if it comes to that, and learn what you can do to change for the next round.
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Old 02-24-2013, 11:36 PM
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im a fan of using a 52 rear sprocket, and then swapping 13/14 fronts depending if im riding trails or track/desert. front sprockets are like $10 and require 1 bolt to remove, so to me it makes the most sense.
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Old 02-26-2013, 02:35 PM
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If you wanna go (Momma Im Goin FAST) Fast. go with a 13front 49Rear. I bought my CR set up that way and its pretty damn fast. I can hang almost hang with the 450's in the straights.

But this is what I recommend. Spend the $20 each for the Tusk brand steel rear sprockets in different sizes and figure out what is going to work best for you. Figure if you buy a 51, 50, and 49 tooth rear sprockets youve got a good range of gearing to play with for pretty much the same cost as one Aluminum Renthal sprocket. That and they last way longer. And you will probably get some added benifit from the extra rotational mass.
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Old 02-26-2013, 09:36 PM
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Hmm. Not sure what "benefit" you get from more rotational mass and more unsprung weight??? Not that the weight difference between aluminum and steel sprocket is significant enough to notice. I do agree though that experimenting with different ratios is a good idea.
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