Grant demystifies the black art of Tire Changing and Repair to help you STAY on the road! "Very informative and practical." See the trailer 
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| Tech ALL bikes: "Generic" tech questions and answers. Maintenance, general discussions etc. |
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#1
23 Aug 2011
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tires size to change mph?
I have a Honda VTX 1300R MotorTrike. The speedometer reads 5 mph to fast at 60 on the speedometer, I'm only going 55 by my GPS. I want to put on norrower wheels on the same rims, and if I get taller ? wheels will that put me closer to the correct speed without loosing mpg. Any help would be appreciated.
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#2
23 Aug 2011
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Hi GeoDenny,
I had to do a google search to see what your trike looks like. I am not qualified to advise you but you might have more luck asking this question at a VTX1300 trike enthusiast site like: Honda VTX Forum | VTX 1300 & 1800 That said, I see the stock rear trike tires are 205/R70-15. Your speedo reads approx. 10% fast. All you need is a higher profile tire on your current size rims to lower the speedometer readout back closer to accurate. The only problem I see is the rear fender clearance. Not sure how hard it is to raise the fenders to keep a higher profile tire from rubbing . Might make the trike look a little goofy though. Best luck, John Downs
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Panama and back on a 250 Super Sherpa minimalist adventure http://www.advrider.com/forums/showthread.php?t=566414
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#3
23 Aug 2011
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That's How They Work
There's nothing wrong with your speedo that's just the way they are set up. It must legally read -2.5 mph and its bottom tolerance is -10% of indicated reading. So at an indicated 50 mph you are actually traveling at between 45 and 47.5 mph.
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#4
24 Aug 2011
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Yes, all bikes read 10% high and all cars read 5%+ high.
Best option is to fit a speedo-healer (or speedo-DRD) if you are really concerened about it.
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Garry from Oz - powered by Burgman
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