This may have been asked before but is it possible to get a 20 inch (ie. 3.00×20, 3.25×20 etc.) tyre and inner tube suitable for road use ? Avon used to do one but are these still available ?
The best supplier in my mind is Coker Tire in USA. I have used Coker tyres for vintage cars and bikes since 1973, and can vouch for their good quality. Their tyres are full-size (premium) tyres.
You reach Coker Tire at http://www.coker.com, and push the motorcycle tyre button. They have two suitable sizes, but it seems that their 3.00×20 is the most suitable:
3.00×20 Coker Classic Front Item #17080 $77
3.00×20 Coker Classic Rear Item #16542 $80
3.50×20 Simplex Cycle Tire Item #16907 $103
For both sizes they recommend 17″-22″ rimstrip Item #18378 – and
for 3.00×20 they recommend their tube #16623: 2.50/2.75-19 TR6 Metal stem valve.
For 3.50×20 they recommend a slightly larger tube, normally used for 21″ tyres and for 28×3 Clincher tyres.
Best regards, Carl
Dare I mention in this company that Vincent’s use 3.00 x 20’s so the VOC might be worth an enquiry and a bit nearer home than the states too. Nothing against the US you understand but UK customs can get, shall we say, very “dilligent” at times?
The 20″ tyre issue is a big problem.
Yes, Coker & Simplex tyres are available but in my experience they aren’t very grippy! Within the last two or three years Avon made a limited batch of 3.25/3.50 x 20 original pattern SM rears one of which I fitted to a Velo. But it was horrid, very high profile and very “square” in section, with very deep treads, OK for a tourer perhaps but very far from sporty. I ended up by swapping my 20″ rear wheel for a 21″ (see below).
I have a similar problem with my TT Rep currently fitted with a 20″ rim but the ancient tyre is not long for this world, though strangely it grips well. It seems to me that the options are:
1. Fit a “new old stock” tyre – but it may well be age hardened.
2. Depending on the bike:
Fit a 21″ rim (perhaps better for your Sprint) and fit to this a modern enduro front tyre (it must be fitted backwards i.e. the opposite of the marked direction of travel). Both Avon and Continental make suitable tyres. The man at Avon says you should check this with your insurance company! I’ve had a Continental like this on the back of the Sprint for several years and it’s been very impressive.
Or, again depending on the model, go for a 19″ rim. As far as I can see, this was a manufacturer’s option when new on the TT Rep, and probably others too. There are plenty of choices of rubber in the 19″ size.
I’d be interested to hear which way you go on this. How is the Sprint project progressing? Feel free to phone me if you want to discuss the tyre question further.
I have lately bought a couple of 20” Avon SM front tyres in Spain. I got them from “AAW” whose website is the following: www. aaw-bcn.com I hope you find what you need! And please answer back for me to know how is their spares stock functioning.
However, I could not find 20” tube-type so I took a 19” one in my 20” tyre and it is runing without any problem. Of course there are different solutions for each model so I let you know mine is a 1929 Flying Squirrel.
Some useful leads there, many thanks – I wasn’t aware of the coker website so I had a look and they do sell a 20×3.00 tyre just as Carl said. However I haven’t found a supplier for the 20 inch Avon. No luck with the https://www.aaw-bcn.com/ingles/index.htm website either as it’s under construction.
I’m currently using a 19 inch ‘Enfield’ rear wheel with an avon SM but this is intended to go on my Flyer eventually. I have acquired a rusty Webb rear wheel with a 20 inch rim in need of total rebuild. It looks nice and slim and would be ideal for the replica Sprint project (which edges ever closer towards completion – just needs a bit of paint, nickel, MOT and registration now). As an aside i’ve not had any handling problems with the Avon SM’s albeit at relatively slow speeds – however I suspect pushing it to the limit on a track (like Martin does) might be different story.
I’ll let you know how I get on with choosing a tyre but it’s good to know they are available.
Best Regards to all,
Lambook Tyres (http://www.classictyres.com) are still offering a “3.50H20 Avon SM Original”. This is the tyre to which I referred. It has a different tread pattern, squarer profile, and I think a higher sidewall than the current model Avon SM mark 2 (which is not available in 20″ rear).
They also list 20″ Waymasters, front & rear, which may or may not be the same tyre as Simplex and or Coker.
I have talked today to AAW and they have confirmed that they do have samples of 300×20 Avon front tyre. If you still interested enough there is a telephone number in Spain (although they speak English too) where you can contact them: 938418135 (I don’t know which is the international prefix)
In the February 1990 issue of “Yowl” (pp 245) under the heading “Rubber News” it is said that Vintage Tyre Supplies Ltd., 12, Dalston Gardens, Honeypot Lane, Stanmore, Middlesex HA7 1BY can, (or could, this information being 5 years old and they might not be trading anymore), were stocking a “vintage looking block tread rear tyre”. Might be worth a look for those in need.
I use a 3.00 x 20 block tread tyre on the back of my 2 Speeder. The first tyre was a VTS Brand which lasted about 4000 miles, soft rubber but excellent grip. I now have a Waymaster which is identical. This has done about 1500 miles so far. I cannot remember where I bought the Waymaster. On the Front I use a 3.00 x 20 Avon ribbed which hardly wears at all. Avons are not commonly available and Avon make batches from time to time. The Vincent Club may stock them.