Maine Biker Network
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tire size
i am goin to put a 180 instead of a 160 rear tire on my deuce was woundering if anyone knew what it would be i know 180/17 but would it be 50 or 55 that would fit.
thanks
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Replies to This Discussion
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Permalink Reply by D. R. Webb on -
180mm is the width.
50 & 55 are the percentages of the width (profile).
On my Boulevard C-90, when i changed over to Dunlops from Brickstones I went from 180/80 to 180/70.
No issues with two sets of them.
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Permalink Reply by Jeff on -
I'm not sure what your stock size is but it looks like it might be a 160/70-17. If so, it has a 112 mm sidewall height using the percentage as DR noted. In order to get the same (or close) height with a 180 you'd have to go with a 60 series which would give you a height of 108 mm. Slightly shorter sidewall than 160/70. Now, will the added width fit within the swing arm and fender? That, I don't know. Just a note that the 55 and 50 series tires you asked about would be 99 mm and 90 mm respectively.
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Permalink Reply by D. R. Webb on
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Note: Increaseing or decreasing the sidewall height from OEM will create and error in your speedo\odometer.
In my case it was done to correct and inherent error .
DR
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Permalink Reply by Jeff on
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I was thinking that when I read your post but failed to go down that road. You can calculate the difference. Stock tire/wheel height for the 160/70-17 is about 656 mm and a 180/60-17 is about 648. So that puts the 180/60-17 at 99% the height of the 160/70-17 which will make a 1% difference in your speedometer and odometer. In this case it was minimal but in the days of adding large tires to my pickup, it made a big difference. My speedometer could be as much as 10% off which meant I was really going 55 when my speedometer read 50.
D. R. Webb said:Note: Increaseing or decreasing the sidewall height from OEM will create and error in your speedo\odometer.
In my case it was done to correct and inherent error .
DR
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