Front MH90-21 Tire vs 120/70/21 Tire
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Road Captain
Joined: Jun 2009
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From: Central Ohio
Front MH90-21 Tire vs 120/70/21 Tire
Can anyone tell me the difference in a front MH90-21 series tire and a 120/70/21 series tire? I am thinking about dropping a 21" x 3.5" wheel on the front end of my Road King after I bent the front wheel last weekend. I was going to wait until later this winter to upgrade form the stock 16", but looks like now that project has been bumped to the top. 
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A 90/21 tire is 80 mm wide with a 90 height sidewall and a 21" diameter. A 120/70/21 tire is 120mm wide, 70 height sidewall and a 21" diameter. A 90 is too narrow to run a 3.5" rim although I know lots of people do so they can get a white wall on there.
I had a buddy who dented two rims with a 90/21 tire on his 3" rim. I'll dig up some pics from the front of the two different tires for you as well.
I had a buddy who dented two rims with a 90/21 tire on his 3" rim. I'll dig up some pics from the front of the two different tires for you as well.
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Road Captain
Joined: Jun 2009
Posts: 659
Likes: 2
From: Central Ohio
A 90/21 tire is 80 mm wide with a 90 height sidewall and a 21" diameter. A 120/70/21 tire is 120mm wide, 70 height sidewall and a 21" diameter. A 90 is too narrow to run a 3.5" rim although I know lots of people do so they can get a white wall on there.
I had a buddy who dented two rims with a 90/21 tire on his 3" rim. I'll dig up some pics from the front of the two different tires for you as well.
I had a buddy who dented two rims with a 90/21 tire on his 3" rim. I'll dig up some pics from the front of the two different tires for you as well.
I have another question and Hogpro may be able to answer this too. Can the hub kit on a stock Harley wheel be removed and used on an aftermarket wheel that does not have a hub kit?
Last edited by MrHog; Nov 14, 2012 at 08:02 AM.
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From: Puyallup, wa
He has not posted in 8 years. If you get an answer, buy a LOTO ticket.
Seasoned HDF Member
Joined: Aug 2013
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From: Somewhere on the Bourbon trail
Welcome and yes, slim to none he answers back...but you never know.
I think he already answered this 10 years ago...
120/70x21 is a popular size on a 3.5 wheel. That's what I have on my '13 King.
I think he already answered this 10 years ago...
Originally Posted by MrHog
Thank you , Hogpro. I figured it would be a stretch putting a 90/21 on a 3.5" wide wheel. I think for safety I will go with a 120/70.
120/70x21 is a popular size on a 3.5 wheel. That's what I have on my '13 King.
Last edited by RKZen; Feb 24, 2022 at 01:37 PM.
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