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1jeffcat

ST6/TT6 Tire Section Width Guide

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1jeffcat

I figured I would start a section width guide for the ST6/TT6 as a tool for current and future participants to develop their builds with information in hand, as opposed to having to guess on purchases prior to later find out that their wheel/tire combination doesn't fit their desired section width rules.

 

It's important to keep in mind that there are a variety of tires and wheels, which can subtly alter your section width results, while attempting to meet the section width template of your choosing. This is why wheel type and size are listed as not EVERY 15x8 wheel is EXACTLY 8" wide, nor do they all have the same lip design which may or may not make or break you meeting a section width template.

 

List your setup in this format if possible for accuracy:

Tire Brand/Model:

Tire Size:

Wheel Model/Size:

 

General Rules:

https://scontent-lga3-1.xx.fbcdn.net/v/t1.0-9/fr/cp0/e15/q65/46301016_10112898622973085_796986621210656768_o.jpg?_nc_cat=109&efg=eyJpIjoidCJ9&_nc_ht=scontent-lga3-1.xx&oh=b3b453fac3336f1f7b38ba97af4b36f2&oe=5C89216F

Section Width Templates:

https://nasa-assets.s3.amazonaws.com/document/document/12756/NASA_Tire_Tool_Template_-_2017_REV1_.pdf

 

Link to Izzy's, who sells pre-made section width templates:

https://www.izzyscustomcages.com/product-page/nasa-tire-section-tool-super-touring

 

 

 

Screenshot_20181116-001858_Adobe Acrobat.jpg

Edited by 1jeffcat
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1jeffcat

Preliminary information. 23mm references the 226mm template. 30mm references the 257mm template.

 

40665926_10112562651532545_7256054394246922240_n.jpg?_nc_cat=0&oh=d70734bbfac38b4e57840e74af16ddc6&oe=5C2EB27B

 

41021556_10112562651372865_8927552376181620736_n.jpg?_nc_cat=0&oh=e8aab36e7a9872f30f851ca89afbd1fd&oe=5BF3B96A

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1jeffcat

Tire Brand/Model: Continental Tires Series Slick

Tire Size: 225/45/18

Wheel Model/Size:BBS RC 303 18x8.5

Clears 257mm template easily. Does not clear 226mm template.

 

40933841_10112562643169305_7207178581246476288_n.jpg?_nc_cat=0&oh=b98ab4e82897c7db22c9172615cfd074&oe=5BF7BE1B

40684713_10112562643363915_8904115521331396608_n.jpg?_nc_cat=0&oh=26a9c85401fe3e77875407c4e073a248&oe=5C319060

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1jeffcat

Tire Brand/Model: BFGoodrich Rival

Tire Size: 225/45/15

Wheel Model/Size: Enkei RPF1 15x8

Easily clears 226mm template

 

40891070_10112562643618405_7955659508263419904_n.jpg?_nc_cat=0&oh=8f0966d26d54793484cdfdf8ae3181b6&oe=5C2B659E

41089686_10112562649087445_1683368597230977024_n.jpg?_nc_cat=0&oh=dce882de3b2e364f8f8c03cc431b7c8f&oe=5C2CB977

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1jeffcat

Tire Brand/Model: Bridgestone RE71R

Tire Size: 225/45/17

Wheel Model/Size: Ray's Engineering ZE40 17x7.5

Easily clears 226mm template

 

40883766_10112562643957725_1703121186185019392_n.jpg?_nc_cat=0&oh=04f574144da3e699f187bdd7198a877b&oe=5C20EA3A

41027626_10112562648708205_6591994713039962112_n.jpg?_nc_cat=0&oh=5c75540d24d19add690a1683f686b49b&oe=5C359A05

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1jeffcat

Tire Brand/Model: Toyo RR

Tire Size: 255/40/17

Wheel Model/Size: Enkei unknown wheel 17x9

clears 257mm template with a little room left

40932304_10112562644406825_7705979019098849280_n.jpg?_nc_cat=0&oh=921d0a375a0be3a4a7e476823cf0e1ef&oe=5C223BB1

41155289_10112562644182275_8262846568684584960_n.jpg?_nc_cat=0&oh=d0f618fbbb87a70e456aaceb728242a9&oe=5BF6EDEF

41070181_10112562644536565_8062433486163673088_n.jpg?_nc_cat=0&oh=a98e808342452084e4c02d14dcac1e38&oe=5BEEF038

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1jeffcat

Tire Brand/Model: Hankook RS4

Tire Size: 225/45/17

Wheel Model/Size: Apex Arc-8 17x8.5

clears 226mm template easily

41026186_10112562644806025_4673809241440518144_n.jpg?_nc_cat=0&oh=78dfb1a2242d3ffc6f024c34aa247089&oe=5C2A8722

40684950_10112562644920795_2827894415731720192_n.jpg?_nc_cat=0&oh=ae31c80cde547cda616269cd3b1d43dd&oe=5BED046D

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1jeffcat

Tire Brand/Model: Bridgestone RE71R

Tire Size: 255/40/17

Wheel Model/Size: Unknown Wheel and Size...I'm guessing 17x9

clears 257mm template easily

40973628_10112562645200235_6072505881579225088_n.jpg?_nc_cat=0&oh=44a718efeaa8e697a1aa3a4617752a21&oe=5BEE78D8

41033382_10112562645614405_1700915703298654208_n.jpg?_nc_cat=0&oh=4fb66cb121826a8510d258c5e5de3ae3&oe=5BF242AD

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1jeffcat

Tire Brand/Model: Nexen Nfera Sur4

Tire Size: 255/40/17

Wheel Model/Size: Enkei RPF1 17x9.5

Fits 257mm template EXACTLY. This is so close that you REALLY have to account for mounting and manufacturing defects as you couldn't possibly have a more perfect fitment. The guage fits snugly, but does fall off easily. There is no space between gauge and tire.

41180478_10112562646023585_1852843617274560512_n.jpg?_nc_cat=0&oh=c964d8b863f6c899cb1c59237c6b9134&oe=5C350D09

41205861_10112562646352925_184505923815866368_n.jpg?_nc_cat=0&oh=71c7ec930b47e1f449a3cfe8bcdf398d&oe=5BEEE2B1

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1jeffcat

Tire Brand/Model: Bridgestone RE71R

Tire Size: 255/40/17

Wheel Model/Size: Enkei RPF1 17x9.5

clears 257mm template with some extra room

40874052_10112562646871885_1699086506792058880_n.jpg?_nc_cat=0&oh=38d329aac63ab6353652d93b95dc1a15&oe=5BF78111

40943252_10112562647091445_826793105834377216_n.jpg?_nc_cat=0&oh=fedb462c6b36bb5a6e06730315c04f20&oe=5BED5224

41033722_10112562648453715_6237482550445473792_n.jpg?_nc_cat=0&oh=02ff7603d43a35f90c3dde1ab33650da&oe=5C3B35DC

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1jeffcat

Tire Brand/Model: BFGoodrich Rival S

Tire Size: 225/45/15

Wheel Model/Size: 949 6UL 15x9

clears 226mm with some extra room

40883777_10112562649591435_682915184636854272_n.jpg?_nc_cat=0&oh=ccba3bdf0f2c669f564a10e5eb81234e&oe=5C30146A

41019715_10112562649950715_782340013932150784_n.jpg?_nc_cat=0&oh=ff4c6b80ae013de4bfb80845fcb653a0&oe=5C2DA3E3

41033728_10112568780205635_1690612093935419392_n.jpg?_nc_cat=0&oh=23e91cb90336fcf9b55dc6976944c5f7&oe=5C34BEA4

Edited by Guest

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1jeffcat

Tire Brand/Model: Maxxis RC1

Tire Size: 245/40/15

Wheel Model/Size: 949 6UL 15x10

clears 257mm with a little extra room

41034321_10112562651173265_8000752034896674816_n.jpg?_nc_cat=0&oh=d6b544a8c95b5a31126b71cb87d85862&oe=5C2B0DB5

41073910_10112562650923765_4723632803399335936_n.jpg?_nc_cat=0&oh=bcc9d270cde0d9599f844588fb27b7ed&oe=5BED350D

40906743_10112562650364885_7133988095094947840_n.jpg?_nc_cat=0&oh=23f2a2660768476e45e50ed961608c5f&oe=5C253F74

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1jeffcat

Tire Brand/Model: Hoosier R7

Tire Size: 245/40/15

Wheel Model/Size: Unknown wheel model 15x8

clears 257mm with a little extra room

41151275_10112568779936175_5004233749970288640_n.jpg?_nc_cat=0&oh=e0d1365cc3c44a3d2caec6ace00e8cb1&oe=5C376DAB

41222134_10112568779596855_1914430373102616576_n.jpg?_nc_cat=0&oh=69e2fdf35d080f3e8cd50e7dd43bcc7b&oe=5BF3494E

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dadasracecar

225/45-15 Hoosier R7

Unknown SM wheel 15x7”

Fits 226 perfectly.

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efposs

Im having a problem with Hoosier 205 - 50/15 r7 making 226 on 8 inch wheels, cranking tire pressure to 32-35 it gets there. Why couldnt we just have 228. Ill probably start at 2400 lbs at the beginning of the year and let everyone else get dqed.

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cabowabo
On 9/12/2018 at 6:24 PM, dadasracecar said:

225/45-15 Hoosier R7

Unknown SM wheel 15x7”

Fits 226 perfectly.

...but is it any faster than 205 on 8? Because what's effectively a 245 on 7" wide wheel sounds atrocious, but if it's faster it's faster. 

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frozen honda

Has anyone measured a 205 50 15 RE71R on a 15x7.5" wheel? TRMotorsports C1 wheel ideally. Thanks.

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frozen honda

I contacted Tire Rack to see if they are interested in mocking up tire and wheel combinations for measurement as a service to their customers in the racing community. I would rather pay a small fee to find out legality of a particular tire / wheel combination before I buy a season's worth of tires. Maybe if a few others make this same suggestion TR would consider it. Their brand identity is partly based on being supportive of motorsports and this would fit right in.

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H4CRXSi
On 9/6/2018 at 8:59 PM, 1jeffcat said:

Tire Brand/Model: Hoosier R7

Tire Size: 245/40/15

Wheel Model/Size: Unknown wheel model 15x8

clears 257mm with a little extra room

41151275_10112568779936175_5004233749970288640_n.jpg?_nc_cat=0&oh=e0d1365cc3c44a3d2caec6ace00e8cb1&oe=5C376DAB

41222134_10112568779596855_1914430373102616576_n.jpg?_nc_cat=0&oh=69e2fdf35d080f3e8cd50e7dd43bcc7b&oe=5BF3494E

Given that a 245/40/15 Hoosier R7 on a 15x8 rim clears the 257mm template, is it safe to think that a 225/45/15 Hoosier R7 on a 15x9 rim will clear the same 257mm template?

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Mike W.
On 2/27/2019 at 3:12 PM, H4CRXSi said:

Given that a 245/40/15 Hoosier R7 on a 15x8 rim clears the 257mm template, is it safe to think that a 225/45/15 Hoosier R7 on a 15x9 rim will clear the same 257mm template?

Pretty sure they do.  I think that is what Neuman was planning to run at Nationals last year.

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frozen honda

The 205/50R15 Bridgestone Potenza RE71R on 15x7.5 wheel easily clears the NASA 226 @ 23mm gauge. Someone was kind enough to measure this for me.

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1jeffcat
On 3/5/2019 at 7:24 PM, frozen honda said:

The 205/50R15 Bridgestone Potenza RE71R on 15x7.5 wheel easily clears the NASA 226 @ 23mm gauge. Someone was kind enough to measure this for me.

Yes, that easily clears.  Most 225 200tw tires on 9" wheels clear the 226.

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1jeffcat
On 2/27/2019 at 4:12 PM, H4CRXSi said:

Given that a 245/40/15 Hoosier R7 on a 15x8 rim clears the 257mm template, is it safe to think that a 225/45/15 Hoosier R7 on a 15x9 rim will clear the same 257mm template?

Yes, should easily clear.  225 hoosiers don't have the huge size difference that 205 hoosiers have.  205 hoosiers almost fit the 226 on 15x9s, but don't.  It is so close, that I think a 15x8.5 and hoosier 205 MIGHT clear the 226, but I can't validate it as I don't have a 15x8.5.  With that said 225 Hoosiers easily clear the 257 on 9s.  As a point of reference, 245 Maxxis have a larger section width than 225 hoosiers....9.8" vs 9.3", and 245 Maxxis on 15x10s clear the 257.

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AZELISE
Posted (edited)

Hoosier A7

205/50-15

SSR Comp 15x7.5

Clears the 226 mm with about 6 mm to spare. Yes I am aware the A7 is not allowed in ST/TT 5 and 6.

Toyo RR

225/45-15

SSR Comp 15x7

Clears the 226 mm with about 12 mm to spare. 

Edited by AZELISE

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AZELISE
On 3/17/2019 at 3:18 PM, 1jeffcat said:

Yes, should easily clear.  225 hoosiers don't have the huge size difference that 205 hoosiers have.  205 hoosiers almost fit the 226 on 15x9s, but don't.  It is so close, that I think a 15x8.5 and hoosier 205 MIGHT clear the 226, but I can't validate it as I don't have a 15x8.5.  With that said 225 Hoosiers easily clear the 257 on 9s.  As a point of reference, 245 Maxxis have a larger section width than 225 hoosiers....9.8" vs 9.3", and 245 Maxxis on 15x10s clear the 257.

efposs posted on Nov 27, 2018 that they were having a problem with a Hoosier 205/50-15 working with an 8” wheel. 

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