Needed outer diameter for the fat front tire on 2011+ Sportster
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Road Master
Joined: Jan 2014
Posts: 1,099
Likes: 34
From: NC/SC
Needed outer diameter for the fat front tire on 2011+ Sportster
Well ... as the title says 
I need the outer diameter for the fat front tire on 2011+ Sportster XLC. Basically the distance between the point where the tire touches the ground to the highest point on top.
I am working on determining the fitment of a 2008 Heritage Softail front fender for my front wheel and need your help in getting the right measurements. I know someone over at XLForum has done it on their 2013 Sportster 1200 XLC but both 2011+ Sporty and 2008 Heritage Softail have 16" wheel whereas I have a 18" SuperLow wheel with 120mm tire (stock) on front.
Any info will be helpful.
I need the outer diameter for the fat front tire on 2011+ Sportster XLC. Basically the distance between the point where the tire touches the ground to the highest point on top. I am working on determining the fitment of a 2008 Heritage Softail front fender for my front wheel and need your help in getting the right measurements. I know someone over at XLForum has done it on their 2013 Sportster 1200 XLC but both 2011+ Sporty and 2008 Heritage Softail have 16" wheel whereas I have a 18" SuperLow wheel with 120mm tire (stock) on front.
Any info will be helpful.
Road Master
Joined: Feb 2012
Posts: 1,035
Likes: 2
From: Western Washington
You make it sound like no one is willing to help you out by going out in their garage and measuring for you. I just asked why cant you measure your own instead of putting the blame on other people. If I had one I would go out and measure it for you. I'm just busting your *****. Seemed like a strange question and response to your own post no one replied to.
Club Member
Joined: Jun 2007
Posts: 45,429
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From: Bedford UK
You can help yourself by simply checking the website of your preferred brand, or working it out on first principles. An MT90B16 or 130/90 x 16 tyre (same thing) has a theoretical diameter as follows:
130 x 0.90 = 117mm. Multiply by 2 = 234mm. Convert to inches: 234 / 25.4 = 9.2 inches.
Add to rim diameter: 9.2 + 16 = 25.2 inches. Simples!
Not all tyre brands give rolling diameters, but according to their website an Avon Cobra MT90B16 is 25.1 inches. Near as damn it the same.
There ya go! Patience is a virtue......
Seasons greetings.
130 x 0.90 = 117mm. Multiply by 2 = 234mm. Convert to inches: 234 / 25.4 = 9.2 inches.
Add to rim diameter: 9.2 + 16 = 25.2 inches. Simples!
Not all tyre brands give rolling diameters, but according to their website an Avon Cobra MT90B16 is 25.1 inches. Near as damn it the same.
There ya go! Patience is a virtue......
Seasons greetings.
Tourer
Joined: Oct 2014
Posts: 373
Likes: 133
From: South Dakota
Mine (2014 1200C) measures 30 inches, give or take a little. I could not see the exact tape measure reading while sitting on the bike holding it upright.
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Road Master
Joined: Jan 2014
Posts: 1,099
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From: NC/SC
Thank you so much grbrown and John! This definitely gives the info I was looking for.
PLloyd4: Didn't mean to come off as offensive or anything. You see, I have a measuring tape but not a 2011+ Sportster XLC with fat front tire. Hence the original post.
Merry Christmas to all!
PLloyd4: Didn't mean to come off as offensive or anything. You see, I have a measuring tape but not a 2011+ Sportster XLC with fat front tire. Hence the original post.
Merry Christmas to all!
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Tourer
Joined: Apr 2012
Posts: 375
Likes: 2
From: New Jersey
Hey there King, I attached a link that i've been using. Pretty cool tire size calculator. Gives you a nice little overlay image of 2 different tire sizes if your comparing sizes, also gives you the specific dimensions too. It might help ya out.
http://www.tacomaworld.com/forum/tirecalc.php
http://www.tacomaworld.com/forum/tirecalc.php
Tourer
Joined: Oct 2014
Posts: 373
Likes: 133
From: South Dakota
Sorry about that.
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