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PostPosted: Mon Feb 05, 2018 12:21 pm 
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Greg G. wrote:
Pat533i wrote:
Greg G. wrote:
Our testing of the 275/17 and 18 Hoosier on a 10" wheel had no problem fitting the 282mm tool.



Good to hear. I hope it was measured on a apex wheel haha

Unfortunately not.
I'm going to test out the 9" Arc-8 with the 245/40 x17 R7 in the next few days. I've got my fingers crossed--should be okay--just missed on the 9.5" by 1-2mm.


Any update to testing the 245/40/17 R7 on a 17x9?


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PostPosted: Tue Feb 06, 2018 9:02 pm 
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I tested the 9" Arc-8 with the 245/40 x17 R7 with a date code of 2317, and it fit the 266mm tool by less than 1mm at 35 psi.
I'm a little concerned that there may be a significant variance between tires of different date codes of that specific model (although the later codes seem to be okay). So,
I suggest checking your specific tire. If it measures 275mm off the wheel, it is unlikely to pinch down to 266 by using a 9" wheel. If it is 270-271mm off the wheel, I would
think it would fit.

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PostPosted: Fri Apr 06, 2018 8:49 am 
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I purchased both a 245/40/18 and 245/35/18 Hoosier R7 and neither of them would clear the 266 template dismounted. Not sure how someone got this to work on a rim with pressure???

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PostPosted: Fri Apr 06, 2018 8:49 am 
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I purchased both a 245/40/18 and 245/35/18 Hoosier R7 and neither of them would clear the 266 template dismounted. Not sure how someone got this to work on a rim with pressure???

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PostPosted: Fri Apr 06, 2018 7:20 pm 
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davidfarmer wrote:
I purchased both a 245/40/18 and 245/35/18 Hoosier R7 and neither of them would clear the 266 template dismounted. Not sure how someone got this to work on a rim with pressure???


It seems it will depend on the wheel width. What size wheel were you planning to run with?

Here was an example for me..
225/45/17 Bridgestone RE71

Unmounted
over 226mm at 3cm
under 226mm at 23mm

Mounted
~221mm on 17x7.5” OEM BMW Wheel

Also, if anyone with measurements would please post your results here I will compile the new data added in the last couple months and update the spreadsheet accordingly. Thanks in advance.


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PostPosted: Sat Apr 21, 2018 9:15 pm 
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I tested a 245/40/17 Hoosier A7 on a 9.5" wheel. It would not pass the 266mm template. The width rules were based off these tires on this size wheel working when they were getting data to create this width rule. Where is the accounting of manufacturing error? This seems ridiculous. I am now on a 225 to be compliant. Thanks!


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PostPosted: Mon Apr 23, 2018 2:35 pm 
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pastoli wrote:
I tested a 245/40/17 Hoosier A7 on a 9.5" wheel. It would not pass the 266mm template. The width rules were based off these tires on this size wheel working when they were getting data to create this width rule. Where is the accounting of manufacturing error? This seems ridiculous. I am now on a 225 to be compliant. Thanks!

I don't know where you got the idea that the rules were based off these tires on a 9.5" wheel, because the rules were based on R7's on a 9" wheel. We never tested these tires on a 9.5" wheel for the rules revision process. I personally tested them for my own car, and they did not fit. I'm not sure why some of the guys on here said they do fit. I also posted that there was some variability in the manufacturer's production of these tires, and they have assured us that they will stay within specifications going forward.

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PostPosted: Mon Apr 23, 2018 5:57 pm 
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davidfarmer wrote:
I purchased both a 245/40/18 and 245/35/18 Hoosier R7 and neither of them would clear the 266 template dismounted. Not sure how someone got this to work on a rim with pressure???


245/40/18 's as you mention do not pass unmounted, but they do pass on 9.5" Arc-8 rims. I have some pictures posted on NASA MA Time Trial Facebook site. Why do they get skinnier on the rim - I do not know...but they do.

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PostPosted: Wed Apr 25, 2018 8:17 pm 
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Greg G. wrote:
pastoli wrote:
I tested a 245/40/17 Hoosier A7 on a 9.5" wheel. It would not pass the 266mm template. The width rules were based off these tires on this size wheel working when they were getting data to create this width rule. Where is the accounting of manufacturing error? This seems ridiculous. I am now on a 225 to be compliant. Thanks!

I don't know where you got the idea that the rules were based off these tires on a 9.5" wheel, because the rules were based on R7's on a 9" wheel. We never tested these tires on a 9.5" wheel for the rules revision process. I personally tested them for my own car, and they did not fit. I'm not sure why some of the guys on here said they do fit. I also posted that there was some variability in the manufacturer's production of these tires, and they have assured us that they will stay within specifications going forward.


Can there not be some 'allowance' for lack of a better term for this manufacturing or whatever variability? Do people really think that 1-2mm difference in width as measured 30mm from the actual tread width is going to make any material difference in performance? 1-2mm is about the width of a pencil tip and for that we are going to make a bunch of folks buy new wheels? Anyone who thinks they were not winning because someone was running a 9.5 inch rim vs. a 9 inch will continue losing. We need to rethink rules like this before Super Touring gets renamed Super Tedious.


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