Honda CX500 & GL500 Forum

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07-20-2010, 10:56 AM divermurf Joined on 09-22-2009 Ocala Florida Posts 26 Rear tire on a GL500 Does anyone know the tallest 16" tire I can put on the back of my 82 GL500? I don't want to change the wheel. I know I put a taller tire on my original Silverwing in the 80's I just can't remember what size it was. Thanks for the help. Kevin Kevin Murphy    Report

07-20-2010, 9:06 PM Blindstitch Joined on 03-14-2009 Greenfield Wisconsin Posts 9,838 Re: Rear tire on a GL500 Same size that you should have on the bike now. If you want taller get a 78 cx rim then you'll get a hair taller tire. 1979 CX500 Supertanker ATGATT makes riding a bike like a sled easier. Quick Reference    Report

07-21-2010, 6:40 PM pwtsvwt Joined on 08-10-2008 Richfield, NC, USA Posts 664 Re: Rear tire on a GL500 The rear tire for the GL should be a 130/90-16.  My math says the diameter of this tire is 25.22 inches. Most of the 140/90-16 tires scrub the swing arm, but there may be a few that don't.  This tire should be 25.92 inches in diameter. The aspect ratio of 90 is the tallest motorcycle tire readily available.  Note: the 90 means that the side wall of the tire is 90% of the width.  Diameter = width (X) ratio (X) 2 (/) 25.4 (+) rim size. Bought on Craigslist - Restored from Ebay: 82 GL500I - now without the "I" -------------------------------------------------------------- I had all my ducks in a row, but they wondered off!    Report

07-21-2010, 7:49 PM divermurf Joined on 09-22-2009 Ocala Florida Posts 26 Re: Rear tire on a GL500 Thank you, that was the info I was looking for I'm sure I had a 140/90/16 on my last one it just barely fit. I'm OK with the tire I have on it I may put a 18" CX wheel on it for when I travel. Kevin Kevin Murphy    Report

07-21-2010, 8:59 PM InWeldingWeTrust Joined on 04-13-2010 Kentwood, Michigan Posts 97 Re: Rear tire on a GL500 You may have a little trouble getting your head around this, but, in effect you may well end up with an effectively wider tyre by fitting a smaller size. Most 130/90-16 ( or MT90-16 which is essentially the same size) are designed to be dimensionally correct on a 3.00 rim, and the CX rim is the smallest rim they can fit on, so it will measure narrower than intended, and be correspondingly larger on diameter. A 120/90-16 tyre is designed on a 2.75 rim width so although narrower, its not effected as much when fitting it on a 2.50 rim. As most 120/90-16 will have a design width of 125-129mm, the effective width may well be wider than a "narrow" 130 (which could measure 128 on a 3.00 rim) being fitted on a 2.50 rim. However, it will of course be smaller in diameter, losing you approx 1 cm of ground clearance in comparison to the 130/90-16 tyre size '82 GL500    Report

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