Wheel rim choice – Diamond Cut or Powder Coated?

[RPSN]

You guys need to man up. Try lifting and fitting 35 or 37'' MT tyres. Typically they get knocked off the Jeep rims in tight V shaped ruts and with long travel suspension you need to jack the corner up anything up to 1m and lift 60kg onto the studs. Usually done stood in a stream or deep mud..

Where I do agree is the lack of need to recalibrate. People often compare static wheel/tyre diameters, but as posted it's rolling radius that matters

Hey Rambo.........Colonel 'Sam' Trautman will be along any minute now! :lol:

Glad you agree on something!

 

[cj10jeeper]

You guys need to man up. Try lifting and fitting 35 or 37'' MT tyres. Typically they get knocked off the Jeep rims in tight V shaped ruts and with long travel suspension you need to jack the corner up anything up to 1m and lift 60kg onto the studs. Usually done stood in a stream or deep mud..

Where I do agree is the lack of need to recalibrate. People often compare static wheel/tyre diameters, but as posted it's rolling radius that matters

Hey Rambo.........Colonel 'Sam' Trautman will be along any minute now! :lol:

Absolutely. Why else would I put myself in my 60’s through such torture

 

[Arne]

I have the 20" Diamond cut Dynogynes. They were ceramic coated (as the rest of the car) just after I bought it 5 years ago (second hand one year old). The alloys still look just as new, and ride quality is surpricingly good (and even a little better after I replaced the P-zeros with MP4S this year).
Regarding speed, no recalibration is needed when going from 19' to 20', as long as you fit them with the correct tire dimension (making the overall wheel diameter aprox the same by reducing the tire profile).
Here are a few examples of how my car look with the Diamond cut:

 

[RPSN]

Lovely car against a scenic background.

The 20" diamond cut Gyrodynes really suit the car. Glad to hear they still look new after approx 5 years and the ride quality (especially with the Michelin PS4S tyres) is good.

When going from 19” to 20” the front tyres go up in size from 245/40 R19 to 255/35 R20 which increases the overall wheel diameter (tyre diameter) from 679mm to 687mm i.e. 8mm increase.

The rear tyres go up in size from 275/35 R19 to 295/30 R20 which increases the overall wheel diameter (tyre diameter) from 675mm to 685mm i.e. 10mm increase.

Thanks for confirming that if the tyres fitted to the vehicle (when going from 19" to 20" wheels) are the correct dimensions, making the overall wheel diameter approx the same by reducing the tyre profile, then no speedo recalibration is needed. In this case, do the above increases in overall wheel diameter fall within your approximation?

This was said earlier in the topic.........

“Regarding recalibration, the rolling circumference of a 19" and a 20" wheel differs by 31.8mm per rev. (assuming same tread depth and tyre pressures). So a 20" travels 1.5% further per rev which, for our national limit of 70mph, equates to 1.05mph. If you really want to spend that cash on recalibration then I'd be happy to take it from you and tell you I've done it (within normal 1.5% tolerance).”