Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Aug 25, 2009 12:19:16 GMT 12
T11-15-14 Tyres
(a) Standard road tyres only permitted.
(b) Standard road tread, maximum tread groove to be 10mm wide
and 10mm deep and must follow the original pattern, with no
cross grooving permitted.
(c) Vehicles with ABS, Traction Control and/or drive by wire must
use the original tyre size, unless the standard width is larger
than 205mm. If the original tyre width is greater than 205mm,
the maximum allowable tyre width is 205mm.
(d) Maximum tyre width for all other vehicles is 205mm.
[glow=red,2,300](e) The Manufacturer’s rating as displayed on the sidewall
determines tyre width.[/glow]
(f) All wheels and tyres are to stay within the confines of the body
profile.
well to me it reads pretty clear ;D
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Aug 25, 2009 16:41:21 GMT 12
well we have a 225 and i made a jig at school that is 205mm and it slides over the side walls of the tyre and also 205 does not mean that the tyre is 205mm and that a 225 is 225mm wide
|
|
|
|
Post by dirtracer13w on Aug 25, 2009 17:42:03 GMT 12
The biggest problem is rwd cars are usually bigger than fwd and the tyre limit 205's make it hard to get traction i run 205's on my streety and have no problem with traction once i get going. also doing the same lap times as the FWD prody cars in welly and thats with a single spinner. going to run 205's on my commy prody and see how it goes. i reckon it all comes down to driver ability and car set up. anybody can win on the night |
|
|
|
Post by dreamer on Aug 25, 2009 17:59:07 GMT 12
Thanks for all the info guys its really helpful
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Aug 25, 2009 18:42:16 GMT 12
well we have a 225 and i made a jig at school that is 205mm and it slides over the side walls of the tyre and also 205 does not mean that the tyre is 205mm and that a 225 is 225mm wide i dont work at a tyre shop but what is written on the side of wall is the tread width i would think, it would be what it was when it rolled out the factory and inflated to correct pressure, this is how the rule was read and clarified last season and has not changed this year, but feel free to come out with tyres that read higher than 205 on the side wall, will be a shame to see you not race though as you wont be aloud to run them. |
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Aug 25, 2009 18:43:28 GMT 12
The biggest problem is rwd cars are usually bigger than fwd and the tyre limit 205's make it hard to get traction i run 205's on my streety and have no problem with traction once i get going. also doing the same lap times as the FWD prody cars in welly and thats with a single spinner. going to run 205's on my commy prody and see how it goes. i reckon it all comes down to driver ability and car set up. anybody can win on the night thank you streety, i only run one 205 on my commy, the rest smaller, and i hooks up ok |
|
|
|
Post by scotty 911w on Aug 25, 2009 18:59:58 GMT 12
isnt the net great ,just found this
. 205 Width of the tire in millimeters.
2. 55 Aspect ratio - This sidewall's height is roughly 55% of the tire's width.
3. R For radial construction
4. 16 Nominal rim diameter code of the wheel on which the tire fits.
5. 88 Load index is a numerical code associated with the maximum load a tire can carry under certain service conditions.
6. V Speed symbol - This tire can carry a specified load under specified service conditions at speeds up to 149 mph.
7. 88V Service description, a combination of the Load Index and Speed Symbol
not that i need to worry bout this rule anymore,lol
|
|
|
|
Post by dan77G on Aug 25, 2009 18:59:59 GMT 12
well we have a 225 and i made a jig at school that is 205mm and it slides over the side walls of the tyre and also 205 does not mean that the tyre is 205mm and that a 225 is 225mm wide i don't work at a tyre shop but what is written on the side of wall is the tread width i would think, it would be what it was when it rolled out the factory and inflated to correct pressure, this is how the rule was read and clarified last season and has not changed this year, but feel free to come out with tyres that read higher than 205 on the side wall, will be a shame to see you not race though as you wont be aloud to run them. Your right there Gribbs, I used to run 215's but as the rule states had to run 205's even though they're less than 205 from side wall to side wall. |
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Aug 25, 2009 19:03:24 GMT 12
lol i think from what i know dan your car would be fast on space savers ;D
|
|
|
|
Post by shooter on Aug 26, 2009 11:03:34 GMT 12
HI i raced a xf falcon at wfg last season #6c. Think i got 11th in points 4 season but i misted 3 meatings which dident help lol. With the 205 tyre thing. I was running 235 60 14's 4 harth the season then had 2 put 205's all round and my lap times went up so i dont relly think thay make much differce my self. RWD 4 EVER.
James Robinson
|
|
|
|
Post by dan77G on Aug 26, 2009 18:01:50 GMT 12
lol i think from what i know dan your car would be fast on space savers ;D Lol i goes good but not that good ;D |
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Aug 26, 2009 22:58:31 GMT 12
HI i raced a xf falcon at wfg last season #6c. Think i got 11th in points 4 season but i misted 3 meatings which dident help lol. With the 205 tyre thing. I was running 235 60 14's 4 harth the season then had 2 put 205's all round and my lap times went up so i dont relly think thay make much differce my self. RWD 4 EVER. James Robinson intresting, was hoping to do a back to back trial this season , but that helps |
|
|
|
Post by hughesmotorsport on Aug 27, 2009 8:10:37 GMT 12
Found this on a physics website that I thought people might be interested in
[glow=red,2,300]Increasing the footprint of your tyres can't improve traction. You're distributing the overall weight of the car across a larger surface area. With a smaller width tyre the weight bites into the surface giving better traction. You cannot increase traction by going bigger with the same vehicle weight.[/glow][glow=red,2,300][/glow]
|
|
|
|
Post by tank11 on Aug 27, 2009 8:15:31 GMT 12
But there comes a time where HP and footprint equal lose of traction.............  |
|
|
|
Post by 69g on Aug 27, 2009 9:41:12 GMT 12
Found this on a physics website that I thought people might be interested in [glow=red,2,300]Increasing the footprint of your tyres can't improve traction. You're distributing the overall weight of the car across a larger surface area. With a smaller width tyre the weight bites into the surface giving better traction. You cannot increase traction by going bigger with the same vehicle weight.[/glow][glow=red,2,300][/glow] So why do sprint cars and saloons run 18inch wide tyres  I tryed to run smaller tyres on my car (production) but it would just wheel spin the whole straight, could have some to do with the surface you run on maybe, I dont know, but from what i could tell from lap times it was definatly quicker with wider tyres on it |
|
|
|
Post by tank11 on Aug 27, 2009 17:07:49 GMT 12
Answer; because they can't handle the increase in speed from the space savers, Footy............. ;D ;D
What do I win.
|
|
|
|
Post by nzf2stocks. on Aug 27, 2009 19:28:41 GMT 12
People, you are comparing race tyres to road tyres and that wont work. Race tyres are based on generating heat across the treadface, which alters the compound producing grip, thats why race cars warm their tyres up before starting racing. Sprint cars and supersaloons generate so much heat through tread walk and wheelspin that if they ran narrower tyres there wouldn't be enough surface area to dissapate it and theyd turn to mush after a couple of laps. Road tyres rely on preassure on the ground, there is a specific lb/in that road tyres work best at and sometimes narrower tyres will get better grip than wide ones. Tread design only has a small part to play, chunky tread reduces the amount of tyre actually on the road and this could actually reduce the grip.
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Aug 27, 2009 19:39:27 GMT 12
intresting reading, your statement makes lots of sense paul, also remember craig peirce running 4wd tyres on rear of brother murrys super saloon one night as an experiment, it did not go all that well,
have said it before we are road cars running on road rims and tyres not purpose built race cars ;D
|
|
|
|
Post by 69g on Aug 28, 2009 10:40:33 GMT 12
Answer; because they can't handle the increase in speed from the space savers, Footy............. ;D ;D What do I win. Congraulations Jon youve won an all expensies payed trip to ruatoria lol |
|
|
|
Post by urmama on Aug 28, 2009 10:59:07 GMT 12
For me the reason I have chosen RWD and have no intention of racing a FWD is that im going to be out there to have some fun and I think hanging it out round the corners will be alot more fun than driving it round,And the other main factor is that all other classes in speedway are RWD so if im gonna have any chance in climbing the ranks and classes RWD is where I need to be but that is my reason. Cant wait for my first season bring it on. Some people may say whats fun about losing but at least at the back ill be enjoying myself and will look good doing it lol
|
|
