Jump to content
SAU Community

R34 GTT 18 or 19s

Adz2332

By Adz2332,
in Exterior & Interior Styling

 Share

Recommended Posts

GTSBoy Grand Master

GTSBoy

Posted
Posted

Have you thought about how low the tyre profile would need to be to run 19s without significantly increasing the rolling radius? For 235 wide, you'd need 35 profile tyres to match the 235/45-17 that is pretty much perfect on a 17. 35 profile tyres are not great for a regular street car (in terms of protecting the rims from potholes, etc, nor for comfort). If you try to go up to 265 width, you'd need to go down to 30 profile to get the same sidewall height.

Not shitcanning the idea of 19s, just pointing out the consequences.

You would use a 40 and a 35 for each of the above widths on an 18" rim.

GTSBoy Grand Master

GTSBoy

Posted
Posted

Where a 265/30-19 has almost exactly the same rolling radius (321mm) as a 235/45-17 (321.5mm), the 265/35-19 is somewhat taller, at 334mm. That's nearly 4% more, which will give a speedo error (reading slower) of that much.

What is the stock tyre size for an R34? Is it 225/45-17? If so, then all the radiuses I've listed above are actually a little taller even than the stock tyre, which is only 317mm. So the error for the 265/35 over the stock tyre is a bit more than 5%.

These aren't huge problems. Just worth keeping in mind.

  • 9 months later...

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • Dose Pipe Sutututu
      NC MX5

      By Dose Pipe Sutututu · Posted

      Lamb roast on Saturday will be different 🥲
    • TurboTapin
      RB25DET with solid lifters - which cams ?

      By TurboTapin · Posted

      They are under bucket shims. Tomei provides a test shim kit and then any measurement of shim required. 
    • GTSBoy
      RB25DET with solid lifters - which cams ?

      By GTSBoy · Posted

      I always wondered how you were supposed to buy a set of 24 buckets and somehow magically have every single one of them yield exactly the desired clearance. I would have thought you'd need to assemble a cam with either 12 "sample" or "example" buckets of known top thickness (or a single such sample/example 12 times over!!) measure clearances at every valve, and then do the usual math to work out what the actual "shimness" of each bucket needed to be, before buying the required buckets to make up he thicknesses that you didn't have on hand.
    • TurboTapin
      RB25DET with solid lifters - which cams ?

      By TurboTapin · Posted

      I now seem to be limited in power due to my rev limit/hydraulic lifters in my built RB25. I'm looking into converting over to Tomei solid lifters. Question for anyone that has done the conversion. I was always under the impression that when using the Tomei solid lifter conversion, you would also require new valves (Longer or shorter stems, I can't remember which).  I don't know where I got this idea, as so far I see no mention of this in any of the Tomei documentation. It just states I need the Tomei solid buckets, solid lifter cams and upgraded springs. As my head is already built, all I would need is another set of 1000$ Kelford cams, 500$ buckets and about 4H hours of my time installing and I'm off to the races!?!? There's no way it's that simple, I must be missing something? 
    • TurboTapin
      Why am I hitting a power wall with my stroked RB25?

      By TurboTapin · Posted

      I couldn't agree more. I should have started from the get-go with a NEO or solid bucket conversion. I started looking into converting over to solid lifters yesterday. Now for some reason I was always under the impression that when using the Tomei solid lifter conversion, you would also require new valves (Longer or shorter stems, I can't remember which).  But I see no mention of this on any of the Tomei documentation. It just states that I need the Tomei solid buckets, solid lifter cams and upgraded springs. As my head is already built, all I would need is another set of 1000$ Kelford cams, 500$ buckets and about 4H hours of my time installing and I'm off to the races!?!? There's no way it's that simple, I must be missing something? 
×
×
  • Create New...