Please, I need help with a tube question

Mosko

I ride an 05 FLHRC and have 10K miles on the rear tire, (D405 Dunlop MU85B-16). I purchased the exact same replacement tire and have it on hand.

Since I have laced wheels, and based on information here in this forun, I've decided to replace the tube and the rim band.

The problem is that I can only find "MU-90" tubes, and I cannot find a wheel band for a side mounted valve stem.

Will the "90" tube work with the "85" tire? Or, is there another brand of tube for the "85" not made by Dunlop?

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Mosko

Hobbit

as long as the band is not worn and the spokes are poking thru re use the existing band, the tube should be fine as it is a bigger tube for a smaller space not a smaller tube being stretched to fit a bigger space

Mosko

Perhaps I'm mistaken, but I was under the impression that the "85" is a bit larger / wider than the "90" per se. I originally thought the same as you have posted, but it seemed, (based on my limited knowledge) that I would be "stretching" the smaller tube to a larger tire.

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Mosko

Hobbit

on a tire it will say width/profile/diameter
were the profile is the side wall which is based on a percentage of the tire width so a 85 tire has a side wall profile 85% of the width of the tire
ie 100mm width would mean 85mm high on the profile
a 90% would have 90mm side wall making the tire bigger.
so fitting a 90 tube is fitting a bigger tube into a smaller tire
hope this helps

Mosko

Thank you sir, I've got it.

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Mosko

glider

Maybe this will help understand it a bit more.

Tires- Deciphering The Codes - Harley Davidson Community

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