Remember_54

15x10 +25 ofset from 949, is like something ideal for racing and driving daily, and i can still put 275 tire on rear.. from technical side of view i found them perfect for my project, but they do not look like rims with negative offset or even 0 offset, (because they +25) that the only problem with them.. but i think i will not find something better for my setup . On this tires i probably can drift, drag and just drive car with out lose of handling like on stretched 0 offset wheels? am i correct on understanding ?

sixshooter

I had a very long post for you and my computer ate it.


Here is what you need to know.
-The wheels from 949 are strong and very light because they are made for racing. Lightweight means better acceleration and braking, as well as better ride quality and cornering. Lightweight wheels move faster over bumps and road irregularities and that means the tire stays on the road better and gives you more grip all of the time. Heavier wheels react more slowly and cannot follow the up and down motions as quickly.

-The 275/35/R15 is only available in a racing tire. It is made by Hoosier and is called the R6. It can be used on the street but will not do well going fast in rain puddles because it only has two grooves in the tread to stop the car from hydroplaning. I have driven with this tire in 205/50/R15 size on the racetrack in my 225whp turbo Miata and the grip is amazing. It will surprise you how well the car will stick to the road. You will have fantastic grip for stopping, cornering, and acceleration. It will make you smile.

You can use the 15x10 and the 275 on all four wheels for best performance.

http://www.tirerack.com/tires/tires....omCompare1=yes




-If you want a street tire that is good in the rain, has good grip, has longer tread life, and will fit the 10 inch wide wheels, the Avon CR500 tire in 245/40/R15 is the only one available right now. It won't be as grippy as the Hoosier R6, will be 1/2 inch narrower at the tread, but will last longer. These tires are a new size and I have not ever tried them.

CR500 | Avon Motorsport



What springs and shocks do you have for suspension?

Remember_54

man, you reading my mind.

I`m fully agreed with 275 on the back but are those not big for front?

I think i need CR500 because i will drive more often on city-town streets, and will do only drift and drag a little just for fun, not for race.

i can see that CR 245/40R15 are maybe good choice for all four tires.
but if i get 10" wheels all around then tire will be a little bit stretched, which mean wheel dia. will go down, our roads not so good here but if there are no any more ways to go i will go with this setup.

but from my point of view i would love to have 275 on the back on 15x10" +25 rims, and something about 15x9 +25 in front with 245 or 225 in front
but i can see that there are only one size tire available at CR500 ( i really do not think that i will swap tires because it is not race car for me, just fun car, the reason i want 275 on the back because mymiata is about 300hp, and i was thinking to get big tire so that will help me on drag and just street drag..

i have factory suspension, i was thinking to get one kit guys from flymiata recommended them 6 month ago what you think i`m planing to take wheels and new suspension kit, but this suspension kit a little bit expensive how do you think is it ok to go with this kit, or you have something in mind, as you know i`m driving car more for fun, not for super results on track.. but always like idea to go for race, same as drive daily on same setup.

i`m glad that you answering and helping me. thanks man.

sixshooter

If you are making 300hp, you will appreciate the grip of the Hoosier 275 tires. If you are street racing, you will appreciate the ability to stop very quickly in an emergency also. I would use the 275 all the way around if I wasn't worried about driving in the rain or in freezing conditions. If you only drive it when the weather is nice, then they are perfect.
These tires are not too big for the front:



If I was going to drive in the rain often then I would consider the Avons, even though they are 21mm narrower. Or maybe just the Avons for the front. On 10 inch wheels the Avons would not be stretched much at all. They are 10.6mm on the outside and 10.6mm on the inside less tread width than the 275 tires pictured above (21.2mm less overall actual tread width). The Hoosiers are 6.3mm taller in the sidewall than the Avons.

sixshooter

As for suspension, the best adjustable shocks for the best price are the Xida CS.

Xida Club Sport race coilovers Miata




But the cheap way is to make your own performance coilovers using these Bilstein shocks:
Spec Miata Bilstein Front Shock [F4-B46-1488-H1] - $119.55 : Weekend-Racer - Auto Racing Safety Equipment, Auto Racing Gear, Auto Racing Helmets, Auto Racing Suits, We're amateur racers just like you.

Spec Miata Bilstein Rear Shock [F4-B46-1489-H0] - $119.55 : Weekend-Racer - Auto Racing Safety Equipment, Auto Racing Gear, Auto Racing Helmets, Auto Racing Suits, We're amateur racers just like you.

and these springs:
Front http://www.summitracing.com/parts/sum-72-5450/overview/
Rear http://www.summitracing.com/parts/sum-72-5300/overview/

and any adjuster sleeves like this (and give away the springs and the top perch):
Civic EF Da DC2 EF EG EK HB Red Scale Sleeve lowering Adjustable coilover Spring | eBay


Then you can do something like this:
https://www.miataforumz.com/build-th...ge2/#post14271

And it is much better than stock on rough roads and on the race track. It will not ride rough but will ride controlled. The Xidas are better in every way on the street and on the track, but there is a price difference.

sixshooter

Hoosier 275 on 15x10 6ul wheels.

Remember_54

thanks for your reply,

I think i will go with 275 as per your suggests, but i checked Hoosier catalog, and i think they have tires smaller, why not use smaller tire and smaller rims in front ? like 10x9 and 255 or 245 or 225 in front?, by the way i think so, on your photos, cars have narrow wheels in front and wide in rear.

sixshooter

Everybody who races Miatas uses the same size tires and wheels front and rear. None of the cars pictured have smaller in the front. The shape of the car's body is designed to make it look that way to make it look tougher.

80% of braking force occurs at the front wheels and about 60% of the cornering forces. If you have smaller wheels and tires on the front on a Miata the car will understeer and not turn well. It will want to always go straight.

sixshooter

The 245/40R15 Hoosiers are listed on their website but have not reached production yet. They will fit on the 10 inch wheels according to Hoosier.

Remember_54

Now it is more clear for me, so i think i will go for Hoosier 275 on 15x10 6ul wheels.

and last: aren the front wheels and tires not gonna hit the frame when turning on full lock?