A Good Reason to Stay With Narrow 17s

[ML]

I'm running 235/45's on a 17x7 and with tune/decatted/intake, and it will not break loose at all like the stock setup. It kinda makes me sad

[RFB]

A larger diameter wheel may be harder to spin and slow than a smaller diameter same weight wheel thus requiring more power than a stock motor and better brakes (which many of us have anyway {tunes etc.}).

- However -

Rotational mass farther away from center also has a beneficial effect.
Spin a small diameter gyroscope, verses a large diameter gyro. The larger diameter is more stable. The 4 corners of the car - better cornering perhaps ?



CERBERUS

[FlamingRectumSyndrome]

Originally Posted by RFB

Rotational mass farther away from center also has a beneficial effect.
Spin a small diameter gyroscope, verses a large diameter gyro. The larger diameter is more stable. The 4 corners of the car - better cornering perhaps ?


CERBERUS

No, less responsiveness. The tires/wheels will resist changes in direction.

[tahdizzle]

Originally Posted by SirBrass

What about good old canyon carving and some very occassional track, with some ability to slip the back end on turn in (not drifting, just getting the nose pointed around a little faster)?

For spirited driving. The wheel and tire combo is great. There is a reason why the twins have that set up. It's fun. But for grip racing, 215 is not enough in my opinion.

[bkblitzed]

autox is different from road course and canyon. You want a bigger tire size

[mothespaceman]

But...but... the skinny 17's look so... skinny.

[SkAsphalt]

Originally Posted by ML

I'm running 235/45's on a 17x7 and with tune/decatted/intake, and it will not break loose at all like the stock setup. It kinda makes me sad

I was breaking my 255's on 18x9.5's loose with tune, headerback and filter. mmm wonder wonder

[ML]

Originally Posted by SkAsphalt

I was breaking my 255's on 18x9.5's loose with tune, headerback and filter. mmm wonder wonder

I didn't say they wouldn't break loose, I said they wouldn't break loose like the stock tires.

[shattered_memory]

I don't see anything against a wider wheel and tire set up, but I really do not see the reason to go to 265's or even 255 width tires with stock power. That's just slowing you down, which is FACT. No reason to go past a 245 width tire. Best wheel /tire combo is a 17X9 wheel with 245/40/17 tires. Once you go 255 and beyond, it starts effecting gearing.

[Pete156]

Originally Posted by shattered_memory

Once you go 255 and beyond, it starts effecting gearing.

um, no. 255 is width, not height. width does nothing to gearing.

[shattered_memory]

Originally Posted by Pete156

um, no. 255 is width, not height. width does nothing to gearing.

you sure? Think about it......just think.

[SuperDave]

i was always under the impression that this car was built with 18s in mind because the wheel wells were so large and our speedometer is off by 2 mph faster than reality. if we have 18s both would be rectified.

[Tank]

Originally Posted by SuperDave

i was always under the impression that this car was built with 18s in mind because the wheel wells were so large and our speedometer is off by 2 mph faster than reality. if we have 18s both would be rectified.

I've noticed many wheels look like they have more of their mass closer towards the center. It's hard to explain without a good picture, but rather than having very long spokes, they have shorter spokes and more of an outer rim that fans out towards the tire bead. Could this be for lowering rotational mass?

[RFB]

Originally Posted by FlamingRectumSyndrome

No, less responsiveness. The tires/wheels will resist changes in direction.

Yes - exactly. Less responsive, more stable, less quick to break loose on a corner. The faster the wheel rotates the greater the gyroscopic effect.

Scooters with small wheels are very twitchy and can't be cornered fast while motorcycles with larger wheels can corner very fast and leaned at absurd angles.They don't fall over due to the gyroscopic effect stabilizing the vehicle them up.

In any case the difference between a 17 and an 18 inch wheel is miniscule given the same weight as most end up stock diameter for speedo accuracy, as is the miniscule added gyro effect.

I went from a 20 lb.,17 inch wheel to a 17.25 lb.,18 inch wheel and the larger wheel was more responsive - overall weight methinks should be the greatest concern.





CERBERUS