Recommended Tire Size for 70' Original Narrow Fender..

70750S

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I am sure this may have been discussed; however, I haven't seen this discussed recently. I have a 1970 750S with the original narrow fender and actual tire and am in the process of rebuilding the bike. I would like recommendations for the best tire to use for the narrow front fender as I want to keep the narrow fender and rim. Could I ask you all for recommendations and help? Thanks in advance.
 
Avon Speedmaster 3.25-19 is still available. The original tire was 3.00-19.
I managed to find a new Avon 3.00-19 when I did this ‘69 project.

Recommended Tire Size for 70' Original Narrow Fender..
 
The Speedmaster maintains originality, but some folks, including me, don't think much of the ribbed tread.
 
I put a 3.00-19 Speedmaster on my '70 Roadster as per the original fitment. Modern rubber, seems to grip OK.
 
The 3.60 Dunlop K81.
Unfortunately, for some unknown reason the 3.60H-19 Dunlop is not imported to the US. I have one on my '69 'S' but I had to get it from Walridge in Canada. He has to import them in bulk, so he's sometimes out of stock.
 
Unfortunately, for some unknown reason the 3.60H-19 Dunlop is not imported to the US. I have one on my '69 'S' but I had to get it from Walridge in Canada. He has to import them in bulk, so he's sometimes out of stock
 
The Speedmaster maintains originality, but some folks, including me, don't think much of the ribbed tread.
I was just looking for a tire that fit inside that early narrow fender like the OP asked. I never really pushed these Avon SM on either this 750S or the ‘61 ES2 I’ve installed them on. I think I would not like them on my ‘72 combat.
 
If you were trying to scrape your ears on the bends , the 3.00 - 19 KR 76 ( 327 compound ) Fits no trouble .

The Modernised speedmasters likely pretty good - Ticularly directionally . for a ' sensable ' rider .
Setting up the rear brake so it has ' a bit of grab ' ; means you can control with initiating oversteer ,
If you like trying to lock the front tyre leant over , the KR 76 or TT100 is more your cup of tea .

We used to avoid japanese ' nylon ' TT100s . has a IRISH one ! & a made in uk / england .
tho the REAR on the 500 triton ( with the KR 76 front ) was a made in USA K 81 R ,
with the TOUGH CARCASE .
So , if you see K81 R ( TT100s ) theyre the hot shot heavy dooty derivative .

Recommended Tire Size for 70' Original Narrow Fender..


These have very short sidewall heavy duty cases . Were replicated around 2000 , but near unobtainium ,
tho was given a good one a while back . The rear 83 / was paerished & split . Storage is the key to condition .

Recommended Tire Size for 70' Original Narrow Fender..
 
Theres a wide selection of 21 inch 3.00 tyres , for the chopper boys - ardly ablesin ,
metzlers & perelli's etc . So might be there in 19's ? .

Recommended Tire Size for 70' Original Narrow Fender..


Avon Speedmaster MK II 3.00 x 21​


Allwas orified me thinking of auling up a 6000 lb arley , on one a these . tho most didnt have FRONT BRAKES , so that solved one thing , anyway . ;)
 
So assuming you want old style to keep the original look........

Tucker (www.tucker.com) has both 3.00 and 3.25 Avon Speedmasters.
They will ship to your local dealer.
Unsure if the 3.25 will fit however.

For the 3.60 K81, yes, I had to import my own while on a trip to Europe. I gave it to the airline as checked luggage and it came through. Waldridge might be an easier option.

My '70 Fastback came to me as original and it had a Speedmaster on it.
Don't remember the size it had. Will check my photos.

Both K81 and Speedmasters look and work great. My friend rides a heavy Vincent with a front Speedmaster and he is fast.
 
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My experience with ribbed-tread tires is that they follow such things as rain grooves. Very unsettling. Didn't notice that with K81s. That said, I haven't seen rain grooves lately. Could be the pavement wore down erasing them. Perhaps they're still prevalent in California. I haven't bought tires from Waldridge but that's not saying I wouldn't. He's given me very good service so far and I've dealt with him gong on 20 years.
 
My experience with ribbed-tread tires is that they follow such things as rain grooves. Very unsettling. Didn't notice that with K81s. That said, I haven't seen rain grooves lately. Could be the pavement wore down erasing them. Perhaps they're still prevalent in California. I haven't bought tires from Waldridge but that's not saying I wouldn't. He's given me very good service so far and I've dealt with him gong on 20 years.
Rain grooves are in fact still quite common in California and K81's track them to an extreme degree, I have not had that problem with Avon Roadriders.
 
Rain grooves are in fact still quite common in California and K81's track them to an extreme degree, I have not had that problem with Avon Roadriders.
My experience with K81s has been similar, although we call it tramlining here. The modern soft compound combined with the deep open tread really doesn't help.
That said, loaded up in a corner they're pretty good.
I've got a pair of Roadrunners for the Combat, but it's still a work-in-progress. I'm hoping they'll behave better whilst keeping that period look.
 
I went out and looked at the tire I took off the Atlas and saved as it had lots of tread left and was mounted on a 19" Commando rear wheel. It is indeed an Avon Roadrunner and not a K-81. I had a pair of them fitted at one time. The Atlas was quicker handling with that pair. I think the Commando had K-81s on it when I got it in 1988. I didn't save those tires but I have some very old NOS dirt tires including an unused Avon New Gripster (400x19) in case someone wants one for a show bike.
 
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