Rear tire size for 125 Six days

[Mickey Sergeant]

I had my Berkie at the Penton display at the Seattle supercross, I was talking to a tire manufacturer about tires. Wanted to know if there's a market for the smaller tires. Cant remember who it was. It sounded like to me they had the rights to the Metzeler mold and are thinking of making a metzler copy 3.50 and 4.00

[brian kirby]

Pirelli owns Metzler so it was probably them.

Brian

[tofriedel]

I am finishing a 69 Steel Tanker that has a Cheng Shin C-755 3.50 X 18 rear tire on it which rubs the Chain Guard and it is not acceptable.  The widest part of the rear tire measures 3.93 inches.

My estimate is that the widest part cannot be greater than 3.75 inches.  

Anyone know of a rear tire that is close to 3.75 inches in width?

Thanks for any ideas.

Tony

[brian kirby]

Bill Ryburn has a 4.10-18 Duro HF335 on his Steel Tanker and it does not rub the chain guard.

Brian

[Bill Ryburn]

Brian is correct. The 4.05" maximum width Duro does not rub the chainguard on my late '69 Steeltanker (V1893.) I just measured the distant from the chainguard to the opposing swingarm tube, at the point of the widest part of the tire, and the width is 5".
With the Duro I have about 1/2" clearance on each side, and I had a little more when I was running the CS.
My Steeltanker is running the original Radelli rim and has never been re-spoked. Also has the original chainguard.
Could you possibly have a re-spoked rim that is offset to the right? Or have incorrect spacers at the hub? Do the sprockets align correctly? How much clearance doyou have on the opposite side from the chainguard?
The CS should fit, so something isn't right.
Bill Ryburn

[brian kirby]

I was not going to say that, but if the 3.50-18 Cheng Shin does not fit, something is wrong with your wheel offset or spacers. The Chinese tires like the Cheng Shin C755 and the Duro HF335 are actually much, much smaller than their listed size. The C755 3.50 is an extremely narrow tire and should not have any problem fitting a Steel Tanker or CMF without rubbing.

Brian

[Dwight Rudder]

quote:Originally posted by brian kirby

The VE33 is too big for a Steel Tanker or CMF Sachs Penton. That would be a great tire for a Jackpiner.

Brian

Brian, They now have a 100/100X18 VE33.  Much smaller than the 110/100X18 that you are thinking of.
The VE33 is a copy of an early 80s Trelleborg. I put them on my PV Husqvarnas.

[454MRW]

Dwight,
How well do the VE33 work in various terrain? Thanks, Mike

Michael R. Winter
I enjoy rebuilding and appreciating Pentons!
1974 250 HS Pentons-1980 KTM 175-400'S
1975 Can Am 175 TNT & 77 250 Black Widow
1979 Husqvarna OR390
1976-78 RM & 77-79 PE Suzuki's
1974 CR250M 07 CR125R 79 CR250R

[brian kirby]

quote:Originally posted by Dwight Rudder


Brian, They now have a 100/100X18 VE33.  Much smaller than the 110/100X18 that you are thinking of.
The VE33 is a copy of an early 80s Trelleborg. I put them on my PV Husqvarnas.

I was thinking of the 110, but a 100/100 would still be too big for a Steel Tanker wouldnt it?

Mike, the VE33 is the only good tire you can get for the 17" rear wheel on Husky's and its a fantastic tire. Its an intermediate tire and works really well everywhere.

Brian

[jasonlamar]

Thanks all for comments.  Here is my project.  I ended up getting a cheng shin 4.1X18.  It looks about same as 4 X 18 that is on there.  





Can anyone identify the rear swingarm?  I understand it to be off a later '70s 250

[mikerichards]

Just installed a 4.10 x 18 on my 72 125 six days restoration.  Just fits, and clears the chain guard too.  Tight fit though.
Prior to restoration it had a 4.50 x 18 on it before, hence a damaged chain guard from tire rub.

LOL

[brian kirby]

quote:Originally posted by jasonlamar
Can anyone identify the rear swingarm?  I understand it to be off a later '70s 250

Looks like a stock swing arm to me. A KTM engine swing arm wont fit a Sachs without a lot of modification.


Brian

[jasonlamar]

Oh... So its just red. I was told the three shock positions was not stock.  Ok, that clears that up for me.  thanks!

[jasonlamar]

I need to get a new photo of this swingarm uploaded.  I am trying to get a chain guide mounted and the tabs are not on the bottom for the typical '73 six days.  there are the front "pins" where the guide attaches, but the rear mounts are on the top of the swing arm.  does this sound familiar to anyone?  I have the correct chain guide for my model, but it won't hook up.  It was great to see everyone at the potluck at Mid-ohio.  I wasn't able to stick around for the meeting but did enjoy seeing everyone that was there.

[jasonlamar]