laverda 750SF tyre size

E

enricozago

New member
Location
Bologna, Italy
Hi everyone

I'm new to the forum as a new owner of a '72 750SF.
I'm about to restore the bike which indeed needs very few works.
Anyway I do need to change the tyres and I'd like to fit Dunlop TT100s but I'm not sure about the right size as it seems that they're not straightforward.....
I'd like to get the same effect as in the attached picture that seems to me very balanced.
I've noticed in the forum that some use 4.10 others 4.25. Can anybody with experience advise?

Thanks a lot for your feedback

Enrico Zago
 

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Enrico welcome and congrats on your purchase

Anyway I do need to change the tyres and I'd like to fit Dunlop TT100s
Click to expand...
Why ???
You can have my set if you want they are shite tyres the only reason that they are on iit is that the previous owner put them on! And as they are still new am trying to wear the bloody things out a bit before they head for the bin.

What about some photos of your newly acquired machine then
 
First of all thanks for your answer

Indeed I never had the chance to test TT100s so I cannot say how they are.
I've heard good and bad things and I ve concluded that there is a lot of personal feeling in it.
I recognize the quality of tyres such as bridgestone BT45s (definitely best tyres I ve tried on my '78 airhead bmw).
However I wanted to achieve the full '70 feeling, including the look.
This said do you really discourage this choice?

Pictures of my new bike still in as-purchased condition.

Thanks everyone

 

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I agree with Brett, the Dunlops may have been good in their day but there are better choices out there today that will still let you keep the vintage look of your Laverda.

I'm partial to the Metzeler Lazertecs and the Pirelli Sport Demons. I put a set of the Pirellis on my 77 Ducati earlier this year and I really like them.

Very nice SF by the way !
 
So dont go any bigger than a 4.00 on the front, I suspect maybe some of my drama's are due to the 4.25 on the front of mine but as say,
Each to their own I guess but when you see made in Indonesia on the sidewalls then that is a big seed of doubt... why waste your money I say, Marty can vouch for how good they are when he saw my massive slide near Port MacQuarie from these quality tyres...
 
If you want to retain the "feel" of the original tyres, the BT45 are available in both 3.50" and 4.00" respectively.  These sizes are what were normally originally fitted, but with the advantage of modern rubber compounds and tyre construction.  Been using these on my GTL for much the same reason, as the low aspect tyres tend to mess up the proportions a bit.

The TT100 sizes would be 4.10 and 4.25/85 front and rear, very close to the 3.50/4.00 pairing.  Might have been a benchmark in its day, but there is definitely better rubber out there if the bike is not solely a static display item.

piet
 
Well here's my experience with tt100s
Just returned from Bello on 73 sf ( 3,800ks )
Bike handled faultlessly over some of the best
Twisties Aus has to offer 😜😜 and yep we weren't
Sightseeing ! All the Vic's on triples that were in the group
Can vouch for that 😃😃 as they were towed along in the
Slipstream 😜

So I say go for it fella. Sure there is stickier rubber around but tt100s with
The right pressures are fine.
 
Hi Enrico , didnt answer your quest earlier , here goes.

Running Dunlop Roadmaster TT 100 >  4.10 H 18  front and back , Tyres made in Japan

Next , tyre change i might put a 4.00 up front (if they do them ) as it pushes out marginly under speed and cranked over  :P

Other than that they are fine, Put em on and give em a go  ;)
Hooksey.
 
I use TT100s on several bikes (3Cs, SF2, 850 Guzzi Cal and assorted old Triumphs: they're fine, however, you have to get precisely the right sizes and compounds and use pressures that work for you.

These aren't the old dinosaur tyres they were in the 70s: I'm assured they are dual compound and 'on the money' as far as performance goes. Check on the Dunlop website for sizes and compounds available: I think there are three series; std, GP (soft and sticky) and something else.. Each type comes in a different size spec than others so be sure to select the size carefully, eg the 4.00 GP is bigger than the 4.25 (85% ratio) whilst the 4.10/55 is tiny..

It seems most folk run pressures up in the high 30s to low 40s. I run mine around 26 and 30 respectively and have no 'moments' etc.. Work very well in the wet too.

HTH

AndyW
 
Yay a tyre thread, it depends on what fork oil you use.

BTW take what AndyW says with a grain of salt, he only rides there, never back......
 
Thank you guys for sharing your experience,
I believe I'll give a chance to TT100s.... by averaging all your advices I'll go for 4.10 F, 4.25 R.

Maybe in one month I'll have to replace with BT45s  :D

b.t.w. MotoMark suggested Metzeler Lasertecs which IMO are not at all comparable with BT45s in almost any conditions, wet or dry.
BT45 are way better than Lasertecs (at least on '70s airheads).
I still retain Metzeler ME77 on the rear because better in terms of mileage especially with pillion and luggage.... BT45 R was far better anyway.

I hope next week I'll have the bike ready with shoes.

Thanks everyone
 

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