FROM: "J5" SUBJECT: Re: balancing mud tires DATE: Sat, 25 May 2002 22:19:24 -0600 NEWSGROUPS: rec.autos.4x4 "Willem-Jan Markerink" wrote in message news:acpav6$rcqrp$9@ID-34205.news.dfncis.de... > In article <3CEB33C4.26BF5B51@ieee.org>, Roger Brown wrote: > > peejoe wrote: > >> > >> On my ford I have Goodyear MTR (285/75-16) and I always feel a shimmy. > >> I was told by the shop that its normal to have a shimmy with mud tires and > >> that they are "zero'd" out and wont get any better. The rest of the truck > >> has been shook down thoroughly and is in good shape. Oh, and the shimmy > >> appears to be more from the rear if there is any truth to the thoery that if > >> you feel it more in the seat of your pants it's in the back, and feeling it > >> more in the steering wheel = front. > >> Anyways, how true is what the shop says? Is a *very* noticable shimmy > >> normal with the MTR's? If not, any hints on improving it? > > > > Lift the rear axle off the ground and let the engine idle with the tranny in > > gear. See if either the wheels, tires or even the axle has any visible runout. > > If the tread wobbles and the wheels run true, it could be out of round tire, > > perhaps on that was mounted improperly (the colored dot on the tire should line > > up with the valve stem hole). > > I've never seen such a dot in my life....8-)) > Would that be on every type of tire/tread, or only on muddies? > And *why* would the manufacturer indicate this? > Lowest weight point of tire, to compensate for weight of valve stem? > > What they can do is 'optimalize', matching the decentering of the rim to the > decentering of the tire (if any). > > >If the wheel and tire wobble, it may > >be a bent axle, especially if you have a non-floating rear axle. > > Not sure where I read this, might be in this newsgroup recently: the rim might > also sit 'uneven' on the wheelflange, for whatever reasons (the drum-releasing > bolt not being turned back out, or something like that?) I believe they mark the low spot on tires on all types. The ones I've seen are an ink dot which allows you to match it up with the valve stem for starters. With a large mud (33's and above in size) it's good to find a good shop with a machine which allows them to measure the runout and static load on the tire while running. The Hunter 9000 tire machines do this so that may be a place to start. I've heard and seen that the MTR's by Goodyear are one of the best tires to balance in terms of amount of weight having to be used - meaning they require little for a tire of it's size. My guess is it's not the tire. Have you checked your shocks? A bad shock will allow jumping. I just recently experienced this. I couldn't get my 35's balanced and it turned out I had a bad rear shock and my front shocks had bled out of pressure (gas charged fox racing shocks). Once the problem was corrected I no longer experience the vibrations. j5 -- J5's Jeep Page is at: http://www.users.qwest.net/~j5/ Last Updated May 2k2 ___________________________ FROM: Roger Brown SUBJECT: Re: balancing mud tires DATE: Sun, 26 May 2002 04:47:18 GMT ORGANIZATION: http://4crawler.cruiserpages.com/index.shtml NEWSGROUPS: rec.autos.4x4 Willem-Jan Markerink wrote: > I've never seen such a dot in my life....8-)) > Would that be on every type of tire/tread, or only on muddies? > And *why* would the manufacturer indicate this? > Lowest weight point of tire, to compensate for weight of valve stem? > > What they can do is 'optimalize', matching the decentering of the rim to the > decentering of the tire (if any). > > >If the wheel and tire wobble, it may > >be a bent axle, especially if you have a non-floating rear axle. > > Not sure where I read this, might be in this newsgroup recently: the rim might > also sit 'uneven' on the wheelflange, for whatever reasons (the drum-releasing > bolt not being turned back out, or something like that?) Most mfg's include this, see below for my new Yoko street tires, yellow dot a about 8 o'clock lined up with the valve stem: http://12.235.196.71/Photos/102_pana/P1020046.JPG Lest you think I'm making this up, here's a good article on it: http://www.trucktires.com/library/publications/periodicals/RealAnswers/97V1Issue2/Doctor.htm Its a good thing to inquire about at any prospective tire shop, if they aren't aware of this, take your business elsewhere. FROM: w.j.markerink@a1.nl (Willem-Jan Markerink) SUBJECT: Re: balancing mud tires DATE: Sun, 26 May 02 12:21:20 GMT NEWSGROUPS: rec.autos.4x4 In article <3CF068D5.91512918@ieee.org>, Roger Brown wrote: >Willem-Jan Markerink wrote: >> I've never seen such a dot in my life....8-)) >> Would that be on every type of tire/tread, or only on muddies? >> And *why* would the manufacturer indicate this? >> Lowest weight point of tire, to compensate for weight of valve stem? >> >> What they can do is 'optimalize', matching the decentering of the rim to the >> decentering of the tire (if any). >> >> >If the wheel and tire wobble, it may >> >be a bent axle, especially if you have a non-floating rear axle. >> >> Not sure where I read this, might be in this newsgroup recently: the rim might >> also sit 'uneven' on the wheelflange, for whatever reasons (the drum-releasing >> bolt not being turned back out, or something like that?) > >Most mfg's include this, see below for my new Yoko street tires, yellow dot a about 8 o'clock lined up with the valve stem: > http://12.235.196.71/Photos/102_pana/P1020046.JPG > >Lest you think I'm making this up, here's a good article on it: > http://www.trucktires.com/library/publications/periodicals/RealAnswers/97V1Issue 2/Doctor.htm > >Its a good thing to inquire about at any prospective tire shop, if they aren't aware of this, take your business elsewhere. Well, to me it's simple: I have *never* seen these dots on tires in Europe (not sure if our BGF's and Coopers are all made in the USA!), *otherwise* I would definately have asked what function they had.... Perhaps there's a little dwarf at Rotterdam Seaport, who rubbs them all off....:)) Nor have I ever seen a dot on a rim, as suggested in that same www.trucktires.com page....perhaps only US-manufacturers do that? It's also a bit odd to see them compare/match a high-height point in tire to a low-weight point of the rim....while this might make some sense, comparing/matching height to height and weight to weight would be my first preference.... -- Bye, Willem-Jan Markerink The desire to understand is sometimes far less intelligent than the inability to understand [note: 'a-one' & 'en-el'!] FROM: Roger Brown SUBJECT: Re: balancing mud tires DATE: Sun, 26 May 2002 14:45:45 GMT ORGANIZATION: http://4crawler.cruiserpages.com/index.shtml NEWSGROUPS: rec.autos.4x4 Willem-Jan Markerink wrote: > Well, to me it's simple: I have *never* seen these dots on tires in Europe (not > sure if our BGF's and Coopers are all made in the USA!), *otherwise* I would > definately have asked what function they had.... > Perhaps there's a little dwarf at Rotterdam Seaport, who rubbs them all > off....:)) > > Nor have I ever seen a dot on a rim, as suggested in that same > www.trucktires.com page....perhaps only US-manufacturers do that? Some of this may be US Department Of Transportation (DOT) regulations, but it appears to be quite common among manufacturers and even on airplane tires: http://www.google.com/search?hl=en&q=tire+yellow+dot+balance > It's also a bit odd to see them compare/match a high-height point in tire to a > low-weight point of the rim....while this might make some sense, > comparing/matching height to height and weight to weight would be my first > preference.... A good tire shop can do that; mount up a tire, check the balance, then mark it and spin the tire 180 degrees and repeat, etc. I had this done on one of my Swampers, we were trying to minimize the out of roundness prior to shaving the tire round. FROM: Chris Phillipo SUBJECT: Re: balancing mud tires DATE: Sun, 26 May 2002 19:41:15 -0300 ORGANIZATION: Bell Sympatico NEWSGROUPS: rec.autos.4x4 > Nor have I ever seen a dot on a rim, as suggested in that same > www.trucktires.com page....perhaps only US-manufacturers do that? > > It's also a bit odd to see them compare/match a high-height point in tire to a > low-weight point of the rim....while this might make some sense, > comparing/matching height to height and weight to weight would be my first > preference.... > > > -- > Bye, > > Willem-Jan Markerink 'Round here you put the bare rim on the balancer first with valve stem installed, find the heavy side of that, then put the dot on the tire opposite it. That's assuming there's still a mark on the tire to see. -- ____________________ Remove "X" from email address to reply.