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From: I am Tosk on 30 Apr 2010 10:56 Can I just change out the rear sprocket on my daughters RMZ250, or do I have to do both sprockets and the chain too? Rowdy Mouse Racing, she is breaking off teeth now! -- Pain is temporary, Glory is forever!
From: Tim H on 30 Apr 2010 11:08 On Apr 30, 7:56 am, I am Tosk <justwaitafrekinmin...(a)gmail.com> wrote: > Can I just change out the rear sprocket on my daughters RMZ250, or do I > have to do both sprockets and the chain too? > > Rowdy Mouse Racing, she is breaking off teeth now! > > -- > Pain is temporary, Glory is forever! If you're changing it because the sprocket is worn, then you need to do the chain and countershaft sprocket too. If it's for a gearing change and the chain and sprockets are in good shape, then probably not. If you put a worn chain on a new sprocket, the chain will load up one tooth at a time until the sprocket is worn to match the chain stretch. This happens because the new sprocket teeth are expecting the chain rollers to be exactly 5/8" apart, so if the chain has stretched beyond that then the chain can't spread the load across all of the links wrapped around the sprocket; all of the load is picked up by the first tooth the the chain contacts on the top of the sprocket. As you can well imagine, this puts a huge load on that tooth and greatly accelerates wear. Tim H
From: Volker Bartheld on 30 Apr 2010 11:53 Hi! On Fri, 30 Apr 2010 10:56:56 -0400, I am Tosk wrote: > Can I just change out the rear sprocket on my daughters RMZ250, or do I > have to do both sprockets and the chain too? If the chainwheel is made out of aluminum, you might get away with two chainwheels per chain/front sprocket because all the rest is steel and wears out slower. However, if the chain itself is also lenghened (which might be the case you're already losing teeth, the old chain might jump on the new wheel. Just check how far you can pull away the old chain from the new chainwheel. If you're "seeing light", you might consider changing the entire set. Next time, probably buy a steel chainwheel or one, where the inner "star" is from aluminum and only the toothring is steel (like the Supersprox Stealth). This setup lasts a lot longer. Good luck! Volker P.S.: Check the chain gliders while you are at it. Sometimes they are worn and chew on the swingarm or the rear cage. -- @: I N F O at B A R T H E L D dot N E T 3W: www.bartheld.net
From: john on 30 Apr 2010 12:12 put her on the 100 having a sprocket/chain failure at the wrong time is an expensive thing john It is dangerous to try to leap a chasm in two bounds. Old Chinese Proverb "I am Tosk" <jus > > Can I just change out the rear sprocket on my daughters RMZ250, or do I > have to do both sprockets and the chain too? > > Rowdy Mouse Racing, she is breaking off teeth now! > > -- > Pain is temporary, Glory is forever!
From: I am Tosk on 30 Apr 2010 12:17
In article <18010c83mnf5u.dlg(a)news.bartheld.net>, dr_versaeg(a)freenet.de says... > > Hi! > > On Fri, 30 Apr 2010 10:56:56 -0400, I am Tosk wrote: > > Can I just change out the rear sprocket on my daughters RMZ250, or do I > > have to do both sprockets and the chain too? > > If the chainwheel is made out of aluminum, you might get away with two > chainwheels per chain/front sprocket because all the rest is steel and > wears out slower. However, if the chain itself is also lenghened (which > might be the case you're already losing teeth, the old chain might jump on > the new wheel. > > Just check how far you can pull away the old chain from the new chainwheel. > If you're "seeing light", you might consider changing the entire set. > > Next time, probably buy a steel chainwheel or one, where the inner "star" > is from aluminum and only the toothring is steel (like the Supersprox > Stealth). This setup lasts a lot longer. > > Good luck! > > Volker > > P.S.: Check the chain gliders while you are at it. Sometimes they are worn > and chew on the swingarm or the rear cage. Thanks all for the help.. I just found the set and I am doing both sprockets and chain... Renthal is what they had in stock, so that's what I am getting. Thanks again, till next time... Rowdy Mouse Racing, corners, corners, corners! |