250r dune gearing

[GPracer2500]

What gearing are you all running in the dunes? Currently I've got the stock 13/39 with a PT high rev, Boysen reeds, unknown porting, 38PJ, +2 swinger, and I'll be using 20x11x10 8 paddle Sand Sharks. I'm an intermediate+ duner with an emphisis on snaking, not dragging. I'm asking because I've not ridden this (or any) ATC in the dunes before.

Is there a good source for steel rears in anything other than 39?
Does running a 12 up front wear down the chain slider?

I can get by on the chain/sprockets that are on there now for one trip but if there's a clear answer then I might replace them first.

thanks

[Pete]

with a 250 based motor I've always run 12/38 or 12/39

I get my sprockets from Dennis Kirk because I drive by there all the time, from 37, 38, or 39 in steel they're almost always in stock.

[GPracer2500]

I've checked DK's website and only see 39. Who's the maker on those?

Any issues with wear on your slider running the 12?

thanks

[breastman569]

if you going to 12 in front i would go bigger in the rear because putting a 12 up there is just to tight of a bend for the chain to follow and your more likely to throw you chain. i would go 42 or 43 in the rear if you want more tourque.

[Pete]

36, 38, 39 steel
http://denniskirk.com/jsp/product_catalog/Product.jsp?skuId=8102936S&store=Main&catId=112&productId=p81029&leafCatId=11208&mmyId=3890

[GPracer2500]

I think my 85 might be a different application [shrug]? Should have mentioned it was an 85.

[Pete]

ah, I'm not sure about the 85, being the swingarms etc are diff the sprockets might very well be different as well.

[GPracer2500]

Well, maybe I'll just run and aluminum rear (if I decide a 39 isn't what I want). Even Sprocket Specialists doesn't have a listing for anything but a 39 for an 85. But they've got aluminum in basically any size you want.