How about ACB9s?

[Al Navarro]

Anyone? Anyone?

Also, the ACB9s weigh 10 lbs less than the CR6ZZ...should I care?

[yellowss7]

10 pounds a tire? or 10 pounds in total? Big difference.

Al, I just talked to a guy who has his uncles Lotus 7 from the early 60s, and hasn't had it out in over 30 years. I may go take a look at it. I may want to talk to you about the restoration of yours. Happy Thanksgiving

Tom

[Al Navarro]

Tom-

Can you shoot me your home address to al at Mintadv dot com?

I think the difference is 10 lbs a tire.

Happy happy to you, too. Very interested in the specs of the vintage 7...I've nerded out a bit on all the vintage stuff and would love to chat. Mine won't be John Watson perfect, but it will have to do....

[andrew7]

Hi Al,
I also looked at those tires for my car since I was doing 13" and wanted the lightest for rotational weight. I was discouraged when I found out they are easy to puncture and prone to tramlining. They are 10 pounds total, where my A048s are 16 pounds with the 5/32 tread depth. My steel wheels are just under 12 pounds and I think the Kodiak Aluminum racing wheels are 8 pounds but about $300 each. I went from 32# to 28# per wheel and it was a jump in performance. Just some numbers for you to crunch.

[Sean]

From the data sheets I have found, and comparing the two closest similar sizes:
ACB9 in 6.5/23.0-13M size (165mm) weigh 15 lbs per tire
CR6 ZZ in 175/70HR13 size (6.9") weigh 21 lbs per tire

So with ACB9s, 6 lbs/corner weight savings over the CR6 ZZs; 24 lbs total weight saved (unsprung), plus your wallet will weigh that much less too.
NOTE: The ACB9s are also available in 5.0/22.0-13M size, listed at 12 lbs per tire, but that is a significantly narrower tire.

Source:
ACB9 data sheet (http://www.rogerkrausracing.net/files/34184291.pdf) (scroll down)
CR6 ZZ data sheet (http://www.rogerkrausracing.net/files/34184291.pdf)

Don't recall hearing from anybody who has used either one, though.

[slomove]

Not sure how you want to use them. If the ACB9 are anything like the ACB10 (both bias ply) I would not recommend them for road driving. While great on the track, the tramlining on regular roads is a bit disconcerting. But light indeed. My 7" ACB10 are something like 10.5 lbs (IIRC)

[Al Navarro]

Road use. The wobblies I just bought have a UPS shipping weight (in box) of 10 lbs, so I think I can afford the extra weight of the cr6zz, especially considering the negatives you all describe. Not DOT, either, but when has that stopped anyone from being foolish!

[pierats]

What is the difference between the ACB9 and the ACB10?

[slomove]

You probably know the ACB10 as a slightly grooved "almost slick". The ACB9 is a fully treaded tire:
http://www.rogerkrausracing.net/files/34184191.pdf

[JeffC]

Wow, are those prices per tire?!!

[slomove]

Wow, are those prices per tire?!!

Of course. The weight is inversely proportional to the price :ack:
And the ACB10 are indeed very decent track tires.

[pierats]

Yep. Per tire.

I understand the tramlining on ACB10's is not so bad. However, they really don't do well with standing water - which is understandable given their tread pattern.

[slomove]

Well, maybe a matter of getting used to. But when I drove them on the road for the first time (which I normally don't do) I thought something was broken. Normally, when I take the hands off the steering wheel the car keeps going straight ahead. But these tires follow every rut and crevice. On crowned roads they aim for the shoulder.

[slngsht]

Al, be sure to give Radial Tire in Silver Spring, MD a call to price your tires. Ask for Sam and mention usa7s

[pierats]

Gert,

Did you change your alignment for bias tires? I think they are very sensitive to camber....