Guest Ken8143 Posted August 21, 2007 #1 Posted August 21, 2007 One of these days I will get new tires. This is not a question about what brand of tire to get - it is about how the tire is described. My manual for the 87 VR calls for 120/90-18 for the front and 140/90-16 for the rear. Currently there are 491 Elite II on the bike, and the front has MR90-18 71H. I think the rear has a MT or MU. What the heck does MR or MT or MU or 71H mean? is a MT90-16 the same as a MU90-16? They are listed separately and have different prices.
wisorac Posted August 21, 2007 #2 Posted August 21, 2007 Hey, I am not sure what MU, MT, or MR means, but the 71H is the load index and speed rating. The 71 is the load index which when you look the load index up it will let you know the max weight that tire can hold and certain psi amounts. The "H" is the speed/performance rating which lets you know what speeds that tire can travel without the tire heating up and busting. Sports bikes most likely have a "Z" rated wite which can withstand speed of 149mph+. The "H" rated can go up to speeds of 130mph. On cars now days there are S, T, H, V, Z speed/performance ratings(There are others, but those are the basic). The lower the rating the harder the rubber and it gets softer as it goes up. The softer rubber tires give better handling and cornering(provided the car calls for it), but softer rubber tires also suffer from less mileage wear. I hope this helps some.
Guest Popeye Posted August 21, 2007 #3 Posted August 21, 2007 Perhaps this will help to clarify the 'metric vs. alpha' designations: Front Tires Rear Tires metric alpha inch metric alpha inch 80/90 MH90 2.50/2.75 110/90 MP85 4.00/4.75 90/90 MJ90 2.75/3.00 120/90 MR90 4.50/4.75 100/90 MM90 3.25/3.50 130/80 5.00/5.10 120/80 4.25/4.50 140/80 5.50/6.00 120/90 MR90 4.25/4.50 140/90 MU90 5.50/6.00 130/90 MT90 5.00/5.10 150/80 MV85 6.00/6.25 150/90 MV85 6.00/6.25 Speed Ratings: Maximum Design/Test Speed J Type62100N Type87140P Type94150S Type112180H Type130210V Type149240Z Type149+240+Tires with 2.00, 2.25 & 2.50 nominal section widths are rated for 75 mph. Funny that the 'H' designation is out of sequence. Load ratings: LOAD INDEX (LI) RATING CHART LIlbs.LIlbs.LIlbs.LIlbs.LIlbs.20176332544637559536727832118234260473866055173805221873526748397615677482723193362764940862584758532419837282504196360076882252043829151430646177790826209393005244165639789372721540309534546666179963282204132054467676778099229227423315548168694811019302344334256494697168210473124044353575077073683107432247453645852071761841102 Hope this helps.
dray Posted August 21, 2007 #4 Posted August 21, 2007 hope this will help you out http://www.phatperformanceparts.com/images/BasicTireInfo.html
Guest Ken8143 Posted August 21, 2007 #5 Posted August 21, 2007 Thanks! That is exactly what I was looking for. Apparently there are different ways of "sizing" a tire.
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