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Tire Question confused about sizes (Read 178 times)

kel30734 Senior Member Offline Dragon Rider Posts: 486 Calhoun, GA Gender:	Tire Question confused about sizes 12/22/09 at 17:36:55 What is the Difference in a 140/80-15 and a 140/90-15 I have a 140/90- 15 on my bike, but bike bandit says the 140/80-15 is stock what dose the middle number mean? Kel
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Serowbot YaBB Moderator ModSquad Offline OK.... so what's the speed of dark? Posts: 28644 Tucson Az Gender:	Re: Tire Question confused about sizes Reply #1 - 12/22/09 at 18:13:20 Tire height as a % of tire width... 140/90 the sidewall is 90% the width of the tread... 140/80 is a lower profile... less sidewall height...
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Paladin.

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Re: Tire Question confused about sizes
Reply #2 - 12/22/09 at 18:13:30

That /80 or /90 is the nominal ratio of height to width. A 140/80 would be nominally 112mm (4.41") from rim to road. A 140/90 would be 126mm (4.96") rim to road. This would mean that the overall diameter of the 140/80-15 should be 23.82" and the 140/90-15 should be 24.92"

Going to Dunlop's website, the K555 140/80B15 is listed at 24.17" diameter, the D404 140/90-15 is listed at 24.73" diameter. Close enough.

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jabman Senior Member Offline Posts: 411 England Gender:	Re: Tire Question confused about sizes Reply #3 - 12/23/09 at 00:47:14 the 90 is better, more top speed, speedo more accurate, just dont have the suspension preload on low or have bolts sticking out under the fender. i havent takin a passenger yet with it though
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Bubba Serious Thumper Offline SuzukiSavage.com Rocks! Posts: 956 Denver, CO Gender:	Re: Tire Question confused about sizes Reply #4 - 12/23/09 at 07:08:02 Sooo, what's the risk of running a 90...aside from tne obvious. Is it really that close under the fender there? I do occasionally ride 2 up but we're pretty light folks...150 + 125... I'm thinking of the Pirelli's but they only have the 90's
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jabman Senior Member Offline Posts: 411 England Gender:	Re: Tire Question confused about sizes Reply #5 - 12/23/09 at 08:32:52 ive got the Pirelli's very good tyre for all weather riding
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Re: Tire Question confused about sizes
Reply #6 - 12/23/09 at 09:32:11

Based on the numbers provided in the thread, the 140/90 has a 2.3562" greater circumference, which ( the way I figure it) is a 3.1% increase in distance traveled / revolution of the rear wheel.
Ive got a Dunlop 140/90 & have been very pleased with it. Shocks set on the tightest setting, I cant see any sign of conflict w/ the fender bolts & its been on long enough to need a new tire. Its a gonna GIT one, too, soon as I get caught up around here. Going to the Dark Side. Got the tire layin out in the geerage.

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Re: Tire Question confused about sizes
Reply #7 - 12/23/09 at 10:46:52

Bubba wrote on 12/23/09 at 07:08:02:

Sooo, what's the risk of running a 90...
I'm thinking of the Pirelli's but they only have the 90's

Ah.... The kicker is that every manufacturer makes their tire slightly different -- any one nominal size of tire can vary by a half inch in either direction. AND there's assembly tolerances that will change the amount of space you have in the first place.

I wore out a Dunlop D404 140/90-15. Strictly road wear, no rubbing, and my 180 (+ Embarrassed

) pounds bottomed the suspension out every day I took it to work over the RR tracks at Vermont and 161st.

I had no problems with a larger tire. Others did.

But... If a bolt head rubs the tire it can be replaced with a smalled headed bolt. Or the shocks raised or replaced with taller.

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Tonydtiger1971 Senior Member Offline Yet while we were sinners Christ died for us Posts: 493 Dawsonville, GA Gender:	Re: Tire Question confused about sizes Reply #8 - 12/23/09 at 13:45:19 Another thing to consider is that the 80 will cost more as a low profile tire that is not made by all manufacturers
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justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: Tire Question confused about sizes Reply #9 - 12/24/09 at 07:14:04 & with the 80 your rear tire will have to turn 834.4253 times to get you a mile down the road. & with the 90, it will only have to turn 809.3122 times, Thats IF theyre actually the size they claim & the dang thing dont wear down. Still, the 90 is a tad "geared up" I wonder why the engineers called for an 80..
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