Front tyre size for 1974 SF2?

C

chrissherwood

New member
Hi all, have just bought a 1974 SF2 with 3.50 x 18 front and 4.10 x 18 rear tyres which I'm going to replace as the bike has not been on the road since it was a couple of years old (still like new though!).
The Tim Parker book indicates it should have a 4.10 front and rear.  That seems a bit overtyred on the front to me. Can anyone advise which is correct for me please?  I plan to use Dunlop TT100's.  Used to prefer Avon Roadrunners in period but they have now changed to Road Riders.
Cheers,
Chris.
 
Hi Chris -  4.10" F&R is fine - can use a 100 or 110 section front too - tyres are such a personal choice, but the 750 has such good handling it's hard (but not impossible) to upset them. A 120 or 4.25"section rear can be used as well, but some can be a bit too nipped in at the rim with a std rim. - Regards - Phil
 
Hi Chris,
I run 4.10 TT100s front and rear on my 75 SF2: handles like its on rails and can pull up short too. I have a 650 Triumph which runs a 3.50 front. The handling is somehow more fluid or 'easier' (especially the feel at the front), however, I don't have the ability to pull up quick (conical drums may have something to do with that though :o). Probably irrelevant really... :D
 
100 on front is quite enough. Some 110s will rub the mudguard.
110 or 120 on rear.

I've been running 100/120 for years. Fine.

Paul
 
Thanks everyone. Looks like I should go for the 4.10 TT100's front and rear (i.e. very close to the 100 size in modern sizing - 4.1 x 25.4 = 104.14, assuming it works that way).
Cheers,
Chris.
 
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