Was looking for some tyres for the Torana, currently have 295/50 R15's which are a pretty good fit but could be wider, but also could be less taller..
Ahuh found some Mickey Thompson sportsman S/R's 26"x12"x15"
Put it though a online converter and came out as equivalent to 305/46 R15 which was perfect for me, a touch wider but not quite as tall.
Ordered a pair through VPW and they arrived today and I straight away thought hmm they look small, checked and they say 26x12x15 on the sides...
Get home and pull the tape out and they are 25" overall diameter and only 11" wide (that's max width including the bulge of the sidewall, actual tread is even less)
Now am I missing something here? Am I wrong to expect that a 26"x12"x15" tyre should actually physically measure to be 26x12x15???
I dislike imperial enough already are the yanks really that backwards?
I took pics with my ruler on the tyres, I'll post em up once I got the laptop.
Why are my 26x12 R15's actually 25x11's?
Started by
_Viper_
, Jul 13 2011 07:53 PM
27 replies to this topic
#2
_Viper_
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Posted 13 July 2011 - 08:05 PM
Just checked the Mickey T website and it states
Sidewall width = 12"
Tread width = 10.6"
Overall diameter = 26"
Sidewall width = 12"
Tread width = 10.6"
Overall diameter = 26"
#3
_rob350hatch_
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Posted 13 July 2011 - 09:35 PM
my 245 r888's measure 265 across the tread and the 255's measure 275,i missed something as well.
and avons i tried were measured by a drunk as well
and avons i tried were measured by a drunk as well
#4
ls2lxhatch
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Posted 13 July 2011 - 11:49 PM
I expect the measurements on the MT website are taken with the tyre mounted on the specified width test rim and inflated to a specific pressure.
It will be interesting to see how much they grow when fitted.
It will be interesting to see how much they grow when fitted.
#5
Posted 14 July 2011 - 07:07 AM
Yep the wheel that they are fitted to makes quite a difference in some instances. Also it seems to be a common trick that "street" class tyre width is measured sidewall to sidewall whereas full slicks are measured in tread width
#6
_Viper_
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Posted 14 July 2011 - 08:50 AM
So you think once inflated they will stretch 1" wider and 1" taller?
#7
Posted 14 July 2011 - 11:20 AM
According to the web site it should go on a rim between 8.0" and 10.0" wide, and they measured it on a 10.0", so I would say yes that's quite likely
#8
_Viper_
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Posted 14 July 2011 - 11:27 AM
See what happens when you don't research something foreign (imperial tyre sizes) enough and buy interstate and unable to see the product before you buy.
Suppose it's my fault, bit of a bummer as 305/45 R15 would have been perfect and I love the tread pattern on the sportsmans... Hmm maybe I just settle for a smaller tyre. But I don't wanna buy rims to suit this width then want to get wider Tyres later.. Hmm
Suppose it's my fault, bit of a bummer as 305/45 R15 would have been perfect and I love the tread pattern on the sportsmans... Hmm maybe I just settle for a smaller tyre. But I don't wanna buy rims to suit this width then want to get wider Tyres later.. Hmm
#9
ls2lxhatch
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Posted 14 July 2011 - 11:30 AM
Only one way to find out 
.
I would be putting my money on the tyre growing when fitted and inflated, the measurements should be within 0.25"
What width rims do you have?
. I would be putting my money on the tyre growing when fitted and inflated, the measurements should be within 0.25"
What width rims do you have?
#10
_Viper_
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Posted 14 July 2011 - 12:08 PM
10's
I emailed VPW he said they list the diameter as the maximum possible diameter you would get with full pressure and doing a burnout etc...
I emailed VPW he said they list the diameter as the maximum possible diameter you would get with full pressure and doing a burnout etc...
#11
Posted 14 July 2011 - 01:34 PM
Being a radial and adding the fact that you will probably run a reasonable amount of pressure on the street I'd say there won't be a lot of growth from burnouts/speed, once inflated it should be pretty close to the advertised size.
Even your average 265/50 street tyre looks a lot bigger and better mounted on a 10" wheel than sitting by itself
Even your average 265/50 street tyre looks a lot bigger and better mounted on a 10" wheel than sitting by itself
#12
_Viper_
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Posted 14 July 2011 - 02:27 PM
Yea I think I might stick with them, there isn't much other choice really... I love the 295/50's but the overall diameter is just a touch too big...
These MT seem to work out at 270/50 15
I'll have another play when I'm home next, see if I can get the 295's to fit with mods otherwise I'll keep the MT's
These MT seem to work out at 270/50 15
I'll have another play when I'm home next, see if I can get the 295's to fit with mods otherwise I'll keep the MT's
#13
Posted 14 July 2011 - 06:00 PM
Nah a 275 probably wouldn't have the true tread width that does, they'll be fine. Less diameter is good too
#14
_YTsLH_
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Posted 26 September 2011 - 02:47 PM
I'm running the exact same tyre on 10" rims. Just gave it a measure and I get close enough to 25 3/4" OD.
Cheers,
YT
Cheers,
YT
#15
_moot_
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Posted 26 September 2011 - 08:33 PM
rim width makes a huge difference, my 275/50/15 et streets measure 283mm wall to wall on an 8" rim and 312mm wall to wall on a 10" rim.
can you mount your sr's on a 10" rim and measure wall to wall for me?
can you mount your sr's on a 10" rim and measure wall to wall for me?
#16
_Viper_
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Posted 26 September 2011 - 10:10 PM
I got em on 15x10's now... working away atm tho so will have to wait a couple weeks till I can measure them
#17
_CHOPPER_
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Posted 27 September 2011 - 11:04 AM
As a general rule, the sidewall measurement changes about 5mm for every 1/2" change in rim width.
#18
_Spark Eater_
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Posted 04 September 2012 - 05:06 PM
just to drag up an old thread,
what did the measurements end up being when fitted to a 10" rim and inflated up to road pressures?
Cheers!
what did the measurements end up being when fitted to a 10" rim and inflated up to road pressures?
Cheers!
#19
Mort
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Posted 05 September 2012 - 12:00 PM
Good one Ed 
.
I am interested in this as well as i have bought then for my car but not fitted or run on them yet.
Have you driven on the Mickey Thompsons, if so how do they handle/wear.
.I am interested in this as well as i have bought then for my car but not fitted or run on them yet.
Have you driven on the Mickey Thompsons, if so how do they handle/wear.
#20
_sshatch355_
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Posted 05 September 2012 - 01:09 PM
i have them on a 15x8 rim and they measure slightly under 28 but mine are 18 mnths old so allowing for wear they would be spot on
they are a great street tyre last for ages mine are only half way down to the wear indicators and they dont grow at all with rpm so you can get the clearances really tight. great in the wet and hook up well considering the hp thats in mine
they are a great street tyre last for ages mine are only half way down to the wear indicators and they dont grow at all with rpm so you can get the clearances really tight. great in the wet and hook up well considering the hp thats in mine
Edited by sshatch355, 05 September 2012 - 01:12 PM.
#21
_Viper_
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Posted 05 September 2012 - 10:19 PM
Sorry guys I must have forgotten all about this thread, Ill be home on the weekend... putting a reminder in my phone right now and ill measure them.
Ive only done about 200km on them before I pulled the car back off the road... Didnt really "test the handling" in that time so will have to wait abit on that one.
Ive only done about 200km on them before I pulled the car back off the road... Didnt really "test the handling" in that time so will have to wait abit on that one.
#22
_Viper_
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Posted 09 September 2012 - 06:36 PM
Had a look today, from sidewall to sidewall is 297mm +/-2mm
#23
_Spark Eater_
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Posted 19 September 2012 - 03:14 AM
I intend to put these on 15x10 rears, I was also wondering what sort of springs you guys are using? I'm looking at A9X firm standard height springs with bilsteins, on a 9 inch.
so does anyone have a working opinion of these yet?
traction in the dry, traction in the wet..
(that's all I can really think of, how long they last doesn't seem to be something anyone would have reached yet)
so does anyone have a working opinion of these yet?
traction in the dry, traction in the wet..
(that's all I can really think of, how long they last doesn't seem to be something anyone would have reached yet)
#24
A9X
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Posted 19 September 2012 - 09:50 AM
can't comment on the tyres, but i run 26 / 15's on the Targa Hatch with lovells standard height 280lb springs and bilstein shocks.
standard width a9x salisbury diff.
They have never touched
standard width a9x salisbury diff.
They have never touched
#25
Evan
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Posted 20 September 2012 - 08:44 AM
Spark eater.
I was chatting to a mate a few weeks ago who has run these before and he commented that they were excellent in the dry but very average in the wet.
I run a 295/50/15 currently and have to run a standard height spring. I had a 1 inch lowered spring in, hit the wheel arches on on big bumps. Note that the 295 has a 147mm side wall.
I will be getting a set when I need to replace my tyres. The car doesn't see much wet driving so it shouldn't be a problem.
Cheers
Evan.
I was chatting to a mate a few weeks ago who has run these before and he commented that they were excellent in the dry but very average in the wet.
I run a 295/50/15 currently and have to run a standard height spring. I had a 1 inch lowered spring in, hit the wheel arches on on big bumps. Note that the 295 has a 147mm side wall.
I will be getting a set when I need to replace my tyres. The car doesn't see much wet driving so it shouldn't be a problem.
Cheers
Evan.
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