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jmac wrote:
l18-b110 - I keep squeezing the other things in because it is important. Hell I didn't even mention that the wider the tyre the less camber it tends to 'like' - which can be indicative of things.
I didnt bother with camber iether simple because my datsun has no adjustment for that and 2nd I was assuming that the 1200 didnt iether.
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jmac wrote:
Of course f1 (or anyone else) is running the widest tyres they can (or what they must run) - you're mis-interpreting what I'm getting at. The reason to run wider tyres is not because they grip better 'per se' - if that's the case I welcome you to get some bob jane australian all rounder tread put on some 265 width tyres, and I'll bring some toyo ra1s around to compare. What I am saying is the _reason_ for the widest tyre possible in a racing situation is to give the opportunity to run the stickiest compound possible, but still get enough tyre life to finish enouh laps between pitstops (or the sprint race distance or whatever). It's not just the width.
Ok for some reason When I read what you wrote im thinking thats what im saying lol. Maybe im not writing it down well enough? or my explanation just plain sucks lol.
anyways my discussion is based off the same manufaturer/model.
Comparing two different tire brand/model is like comparing apples and oranges. you wont accomplish much.
What im trying to say is let say you have a gforce ta drag radials.
Im picking this in particular because I know two tires from them are are very close in spec.
275/60/15 31lbs 28"diamter thread width 9"
325/50/15 32lbs 27.9"diamter Thread width 10.8"
Both will fit in a 9.5" rims
so the overall weight and diamter is pretty close. (I dont know any tires that has the same spec in different width)
what im saying is under these two option, IF your car has enough power that your having traction issues with 275 then going to a 325 will give you more traction.
im ofcource saying that the wider tire will only be beneficial if you have enough power that you reach the limit of the smaller one.
if you havent then whats the point of going wider?
ofcource wider isnt always better. the smallest ones you can get away with is always best.
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jmac wrote:
If you wouldn't mind (and I ask this sincerely, not as a smartalec) - do you happen to have pyrometer readings for the tread - possibly - outer and inner edges and centre region - for the tyres you ran that had the big difference before and after. It'd be interesting to see the spread of temp - both from before and after different tyres, but also to know what temps they ran across the width of the tread, it might be enlightening (to me, if no-one else)
What I was trying to get at, and I'll re-state it (and I know you've said that you would go along with this, and as such we are both sort of talking about two slightly different but related tangents) tread compound is the big deal. It's (relatively) hard to overheat tyres on the street, in most parts of this country, and I can't speak for elsewhere, you'd probably end up getting arrested if you drove hard enough and long enough to overwhelm the tyres. Brake pads - well it'd be relatively hard to overcook a1rms with a bit of touring on twisty roads, but certainly possible on a circuit.
none of that, the comparison wasnt technical it was more result comparison. I simple got more traction with wider tires lol.
I agree on a street car its very unlikely that it will be pushed to its limit. but at that mediocre level of heat and such wider tire will give you more traction. (with what I mentioned above)
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jmac wrote:
I'm DEFINITELY not advocating running 155 width tyres or anything. I hope I haven't come across like that. Perhaps I'll restate it better thusly - width isn't 'all that' I'm not saying run bicycle tyres, but find the specific brands in the wider sizes that have a good track record, it will make or break the deal. There's (unfortunately) seemingly no shortage of tyres available that are 'big' that are also very mediocre as far as grip is concerned.
the same thing applies to brake pads. 'larger' pads, which wrap further around the disc, don't stop better, unless you are reaching the temp limits of the smaller pads. (*if the pad material is the same). The same is true of brake shoe width. IF you are getting them quite hot, then sure, wider is better, but for single stops (or a handful of multiple stops) it won't change things. NOW bigger diameter discs, same pads, definitely improve things, because then they get more leverage.
and one more thing - that's a wicked machine mate.
I agree wich is why my comparison was about the same model of tire. Obviously were talking about the good quality otherwise that would be the first upgrade(to a good quality one lol)
thats like asking whats the best size for drag racing on the track and comparing drag radials size when you can run slicks.
I dont know if you can compare brake pads since the contact is pretty much controlled(ae metal to metal-no debris)
and thanks
I hope I made sence of what im trying to say.
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