Europe and Japan will be returning to the .83 USGA C.O.R standard late 2007.

My buddies at Mizuno tell me that the last year of production of high cor drivers will be 2006.

are they doing this just to have a worldwide universal c.o.r.??

I'd like to see that. Makes more sense to have the same COR on all Drivers worldwide. It almost seems silly that they don't that already.

I'm not to sure, but I always thought that the R&A was testing it on the Japan Tour and Euro Tours. It was always the plan to come back to normal C.O.R on a specified date.

Recently Japan has been calling it S.L.E Spring Like Effect and putting stickers on most new model drivers saying the C.O.R will end on a particular date. Most JDM OEMS will stop making high C.O.R drivers in 2006

they shouldn't have made illegal drivers in the first place. It just makes it more confusing now...

if you bought a non conforming, do you think the manufacturers would let you replace it wiht a conforming one after the deadline?

if you bought a non conforming, do you think the manufacturers would let you replace it wiht a conforming one after the deadline?

LOL your kidding right? :confused:

LOL :fever: :rolleyes:

speaking of c.o.r. comforming and non comforming. is the JDM 3wd, fairway, and hybrid legal for USGA use? or do they also have over .83 cor as well? I compete in many USGA and USGA ruled local events and would hate to be disqualified due to a usage of an illegal club.

I thought the .830 COR Rule was just changed to 257 Characteristic Time. It's the amount of milliseconds a ball can stay on the driver's face.

Is it possible that a driver with a COR higher than .830 can meet the 257 CT requirement? I suspect that the Callaway 454 meets 257 CT but has a COR higher than .830.

speaking of c.o.r. comforming and non comforming. is the JDM 3wd, fairway, and hybrid legal for USGA use? or do they also have over .83 cor as well? I compete in many USGA and USGA ruled local events and would hate to be disqualified due to a usage of an illegal club.

Only Drivers can be non-conforming, The Fairway woods and Hybrids don't have a C.O.R rating and are 100% legal anywhere.

so couldn't you "technically" have a 3 wood thats 400 ccs and thats "15 degrees" but actually more like 10 with a very illegal c.o.r?

so couldn't you "technically" have a 3 wood thats 400 ccs and thats "15 degrees" but actually more like 10 with a very illegal c.o.r?

There is probably a cap on the max size for a 3 wood and besides golf is all about integrity.

Only Drivers can be non-conforming, The Fairway woods and Hybrids don't have a C.O.R rating and are 100% legal anywhere.

Thanks for the info

Mizuno just came out with Grand Monarch Royal Cresta series in Japan for older golfers with slower swing speeds. Driver has 0.9 COR and suggested retail is 210,000 yen or about 2000 bucks. Fairway woods go for 126,000 yen each or about 1200 bucks. The 8 piece iron set is a whopping 630,000 yen or about 6 grand.

I thought the .830 COR Rule was just changed to 257 Characteristic Time. It's the amount of milliseconds a ball can stay on the driver's face.

Is it possible that a driver with a COR higher than .830 can meet the 257 CT requirement? I suspect that the Callaway 454 meets 257 CT but has a COR higher than .830.

The test for characteristic time you refer to equates directly to the .830 COR standard. It's the method that d**k Rugge developed to test COR of drivers on site at PGA Tour events and expressed in the amount of time the ball is on the clubface. Longer time on the clubface means a higher COR value.

i still don't understand how staying on the face longer equates to longer drives.

i mean if you drop a ball on a tenstioned rubber band it will give, stay on the face longer, but it will lose more energy transfer compared to rubber band that is tension tighter where it will not stay on the face longer.

confused.... :confused:

Probably that's the theory of the Mizuno design, the old guys don't crank it up as much to compress the ball fully so the club head compensates by compressing/rebounding for them.

More contact time means better feels and controllability off the tee

Pro Vx and the new Nikes, reading a lot that these new balls pass the old standard launch velocity tests but at higher swing speeds the balls are actually exceeding these limits, carrying further and rolling further