Tire Size Question - Page 2 - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #11 of 16 (permalink) Old 03-13-2019, 11:24 PM
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https://www.dipyourcar.com/products/tire-ink-pen
This is what I used I've tried two brands from AutoZone and this one did way better hasn't cracked or faded and I ride almost daily.
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post #12 of 16 (permalink) Old 05-02-2019, 03:54 PM
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Originally Posted by Spockster View Post
For oversize, you can use these with no problem and the oversize front will make the speedo correct.

110/90 - 19 front
170/80 - 15 rear
how big can you go on the back without a lot of modifications to make them fit? i'd really like a higher fifth gear for freeway cruising, but i hear that's next to impossible. My commute to work is 95% highway, so if i can keep the rpms down, it could improve my mpg.

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post #13 of 16 (permalink) Old 05-02-2019, 06:25 PM
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post #14 of 16 (permalink) Old 05-02-2019, 07:57 PM
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Question on tire size

Quote:
Originally Posted by Spockster View Post
For oversize, you can use these with no problem and the oversize front will make the speedo correct.

110/90 - 19 front
170/80 - 15 rear
It was my understanding that the first number (talking front tire here) of 110 would indicate the width and the second number of 90 would indicate the height, or something to do with the ratio of height to width.

So a 110/90-19 tire (which is what I run) would be wider than the stock 100/90-19 tire. 90% of 110 is less than 90% of 100, so I don't see how that would bring the speedo more into accuracy since the need would be to enlarge the height rather than the width.

I like the 110 width but it didn't do squat to correct my speedo. Try as I might, I have yet to find anyone that makes a 110/100-19 tire (unless you want off-road knobbies).

Because the speedometer is still off I simply disregard my speedo and use my GPS for MPH readings.

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post #15 of 16 (permalink) Old 05-02-2019, 08:02 PM
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I think my math is wrong. Ooops.

Still, the height increase is so minimal that it can't do much to increase speedo accuracy.

Does anyone know of a 110/100-19 front tire? (Is that even possible? Maybe a 110/95-19?) Or would that over-compensate causing the speedometer to read as slow instead of fast?

I've never liked the metric methodology of tire sizing. I still think of car tires as E's, F's, L's, M's, etc.

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Iridium plugs (DPR7EIX-9)
Shenko 230 Tour Master tires at 11,123 miles
Splines lubed at 11,123 miles
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Light bar with LED lights

Last edited by Chris and Shim; 05-02-2019 at 08:07 PM.
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post #16 of 16 (permalink) Old 05-02-2019, 08:56 PM
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Quote:
Originally Posted by Chris and Shim View Post
It was my understanding that the first number (talking front tire here) of 110 would indicate the width and the second number of 90 would indicate the height, or something to do with the ratio of height to width.

So a 110/90-19 tire (which is what I run) would be wider than the stock 100/90-19 tire. 90% of 110 is less than 90% of 100, so I don't see how that would bring the speedo more into accuracy since the need would be to enlarge the height rather than the width.

I like the 110 width but it didn't do squat to correct my speedo. Try as I might, I have yet to find anyone that makes a 110/100-19 tire (unless you want off-road knobbies).

Because the speedometer is still off I simply disregard my speedo and use my GPS for MPH readings.
With the stock setup the speedo reads 5mph faster than actual speed. With the oversize tire mine was within 1mph of the GPS reading, and dead-on with radar screens and radar guns.

Don't forget the N size tires, N50-15, in other words, huge.


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Last edited by Spockster; 05-02-2019 at 09:02 PM.
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