Landracing Forum
Bonneville Salt Flats Discussion => SCTA Rule Questions => Topic started by: Sumner on December 17, 2007, 12:00:37 PM
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In the rule book under tires I've always seen that the VR and ZR rated tires are good up to 200.
Looking for tires yesterday on the Internet I see that most of the ones I can find don't have the "R", but just the "V" and "Z". I would assume they are the same since all of the tire speed charts just say V and Z??
Also I see that there are Y and W rated tires.
Q ............. 99 MPH ......... 160km/h
S ............ 112 MPH ......... 180km/h
T..............118 MPH ......... 190km/h
U .............124 MPH ......... 200km/h
H ............ 130 MPH ......... 210km/h
V ............ 149 MPH ......... 240km/h
Z ............ 149 MPH ......... 240km/h +
W............ 168 MPH ......... 270km/h
Y ............ 186 MPH ......... 300km/h
Since the W and Y are rated quite a bit higher than the 149 mph of the V and Z has there been any talk of accepting them for speeds over 200 mph??
If not is this something that a form could be filled out on to consider in the future??
Thanks,
Sum
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Sum,
Your best bet is to take all the info you can, request a Rules Change form from the office and submit it for review.
I am no longer involved with rules.
DW
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Sum,
Your best bet is to take all the info you can, request a Rules Change form from the office and submit it for review.
I am no longer involved with rules.
DW
Thanks, I'll look into doing that. Does this interest anyone else??
Dan I know you are no longer involved with the rules, but since no one else in SCTA has been willing to step up and try and answer some of our questions would you mind still offering your opinion when you can in an "unofficial" way??
You have been a good link to the SCTA for some of us that aren't members. I'm going to take care of that myself after the first by joining a club.
c ya,
Sum
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Q ............. 99 MPH ......... 160km/h
S ............ 112 MPH ......... 180km/h
T..............118 MPH ......... 190km/h
U .............124 MPH ......... 200km/h
H ............ 130 MPH ......... 210km/h
V ............ 149 MPH ......... 240km/h
Z ............ 149 MPH ......... 240km/h +
W............ 168 MPH ......... 270km/h
Y ............ 186 MPH ......... 300km/h
Sum,
I have to ask why you would even want to consider any of the above tires? When the Goodyear front runners are so inexpensive and come in various sizes. Is there a certain shape you are looking for?
Tom G.
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Q ............. 99 MPH ......... 160km/h
S ............ 112 MPH ......... 180km/h
T..............118 MPH ......... 190km/h
U .............124 MPH ......... 200km/h
H ............ 130 MPH ......... 210km/h
V ............ 149 MPH ......... 240km/h
Z ............ 149 MPH ......... 240km/h +
W............ 168 MPH ......... 270km/h
Y ............ 186 MPH ......... 300km/h
Sum,
I have to ask why you would even want to consider any of the above tires? When the Goodyear front runners are so inexpensive and come in various sizes. Is there a certain shape you are looking for?
Tom G.
This would be for my pickup where I just hope to barely break 200 someday. They would be about the same price as the front runners, but maybe I could actually drive on them to Maxton, El Mirage or the Salt if needed. I wouldn't use them as a year around tire, but it would save me from hauling 4 tires/wheels in the teardrop with me.
At this point I'm just looking at options as I wouldn't need them to run the 135 class at Maxton this year and all of my efforts for the salt this year will revolve around the lakester.
c ya,
Sum
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In the distant past tires were available at a reasonable price which were alowed to run right at 200. Michlen and BFG both had "highway pursuit" tires which were a minimum H rated and most were V's. I have an old set of these H series and ran them on my 40 Chev over 150 with no problem and over 160 on my roadster. They are a 70 series, I believe, most were 28" tall.
These were made for highway patrol vehicles of the 70's. These cars wighed in at 4000# and could run all day accross Montana over 100 mph. I recall one streamliner (which I will not mention) run the same 130 mph tires I had over 240 at El Mirage. It's only a mile and I'm sure heat was not a problem.
Times have changed and lawyers have changed everything we do. We are all just one "accident" from never running again and having tons of scrap metal and fiberglass at home. At this time it would not be in the best interests of any of us to "lower" the limits. Good Luck
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Sum,
Sounds like the old GMC is in for some work!? Good to have future projects already lined up.
Rex
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.................. At this time it would not be in the best interests of any of us to "lower" the limits. Good Luck
JD I'm confused about the above. If the V and Z that are rated to 149 mph are allowed to run to 200 why couldn't a higher speed be looked at for the better, in fact quite a bit better, Y and W rated tires that are rated to 168 and 186 on the highway. When the decision was made to run the V and Z's to 200 I don't believe the Y and W's were around. If these tires are truly better than the V and Z's how would raising their allowed speed to somewhere over 200 be "lowering" the limits??
Thanks for the input,
Sum
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Sum,
For MAXTON: SOME parts from the ECTA '07 rulebook, General Competition Requirements, page 12, 11-6 TIRES:
Up to 175 MPH: HR rated tires.
Up to 200 MPH: VR or ZR rated tires.
Up to 220 MPH: WR & YR rated tires or steel-belted drag radials.
Lot more to that section but think that covers what you are considering for now [to run at Maxton] until you get your new ECTA '08 book.
Ed
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Sum,
For MAXTON: SOME parts from the ECTA '07 rulebook, General Competition Requirements, page 12, 11-6 TIRES:
Up to 175 MPH: HR rated tires.
Up to 200 MPH: VR or ZR rated tires.
Up to 220 MPH: WR & YR rated tires or steel-belted drag radials.
Lot more to that section but think that covers what you are considering for now [to run at Maxton] until you get your new ECTA '08 book.
Ed
Thanks, so it does look like ECTA has move past just the V and Z rated tires and recognizes the W and Y rated tires,
Sum
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The R means the tire is a radial. Virtually every new tire is a radial, unless you have a special tire for a classic car or a racing car.
DW is right, fill out a rules change request form.
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Sum, Dean is correct. The R only means the tire is a radial. The Z means the tire is rated above 149 mph. There is no real Z speed rating. As in 195/60ZR15. Then between the tire size and the rim you'll find a alpha numeric designation, such as, 68W, 71W or many others. The numbers indicate the weight rating and the letters indicate the speed rating. That being said, at least with motorcycle tires, I have found no rhyme or reason as to how they arrive at the rating. Meaning, 2 tires, same size, same mfg., only different tread design will have a different load/speed rating. I guess it's what you can't see. :-D Hope that helps.
Larry Cason
Maybe they're using Dan's old DC meter... :?
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Hey sum - Here is a nice little writeup on weight and speed ratings on tirerack.com
http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=35
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Great article. I think I'll print it and put it in my logbook to use for reference when I'm inspecting tires. I didn't know about those last numbers/letter, and now that I do -- hey, I think I'm ahead of most folks. Thanks for the link.
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Sum, I prefaced my note with in the distant past, pre '80. What was done then would never be done now. The "L" word comes to mind.
As for the liner I believe I'm the only one outside the owner who knew what he used. The wheel/tire combo was very well covered and maybe no one really looked.
As for Maxton's allowable rating and what they allow you need to ask them; but have a 130 tire blow at 175 and have a magor injury. I hope the guys running the show and the deep pocket members have a lot of insurance.