Mu/85/16 vs. MU/90/16 - Harley Davidson Forums: Harley Davidson Motorcycle Forum
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Old 11-13-2012, 10:47 AM   #1 (permalink)
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Mu/85/16 vs. MU/90/16

I know the "90" has a little taller sidewall. Is it enough to be noticeable on a "06" RK cop bike? I ride solo 99% of the time. I'm not exactly sure why I didn't stay with the "85" when I ordered new tires. I have 402's on it now, I ordered E3's. MT/90/16 frt.- MU/90/16 rear. I looked on a tire calculator, it didn't look much taller. It only throws the speedo off by a couple of mph. at 55 mph. I've been a little stressed about it after I thought about it awhile. If it's going to be a problem, I need to start making other arrangements. Any help will be greatly appreciated.
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Old 11-13-2012, 11:03 AM   #2 (permalink)
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Quote:
Originally Posted by Old Coot View Post
I ordered E3's. MT/90/16 frt.- MU/90/16 rear.
I believe it's an MU8516.


MT9016 is a 130mm tire

MU8516 is a 140mm tire

You'll get about 30% more mileage out of an MU then an MT.

Lets do the math:

MT9016 = 130/90-16 (metric version)

130mm / 90% sidewall aspect x 16" diameter rim.

130mm/117mm x 406.4mm

117mm sidewall + 406.4mm + 117mm = 640.4 Total height, or 25.21" tall
___________

MU8516 = 140/85-16

140mm / 85% sidewall aspect x 16" diameter rim.

140mm / 119mm x 640.4mm

119mm + 406.4mm + 119mm = 878.4mm or 644.4mm or 25.37" total height.
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Old 11-13-2012, 11:11 AM   #3 (permalink)
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I have a 85 on it now but I ordered a 90 for some reason. Will it be noticeably taller, in a bad way? I don't think room will be an issue.
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Old 11-13-2012, 01:25 PM   #4 (permalink)
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A tad taller....

Your current tire (MU8516) is: 25.3" tall.

140/90x16 =

140mm/90% sidewall aspect x 16 = 126mm

126mm + 406.4 + 126mm = 658.4mm or 25.92"

So....that number is total height, that would affect final drive, but since you're already reading a tad lower than actual speed, the added .55" or half inch. A half inch will only raise rear ride height 1/4", and you'll see nothing different on your speed or mileage that's going to be even noticable.
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Old 11-13-2012, 03:00 PM   #5 (permalink)
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Thanks Dave, You are the man! I could never have been able to come up with those formulas and done the math. I feel a lot better now. I've done some more checking and I don't think They make an E3 in a "85. I read some where that the E3 MU/90 is the recommended replacement for the 402 MU/85. Now I can hardly wait for them to come in and get those bad boys mounted. Once again, Thanks Dave. P.S. I'm tired of the labor pains. I'm ready for the baby!

Last edited by Old Coot; 11-13-2012 at 05:09 PM.
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