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H: Hubs, Wheels and Tyres Avon Speedster tire?

GBewley

Well Known and Active Forum Website User
VOC Member
I just bought a twin which is shod with an Avon Speedster tire. No, not Speedmaster, but Speedster. Quite old, the tire diameter designation being called out as 26, the tire OD, as opposed to 20, the rim size. The question i have is can anyone tell me roughly when Avon may have stopped producing this tire?

Thanks,

Glenn
 

davidd

Well Known and Active Forum Website User
VOC Member
Glen,

As David points out, the Avon Speedster was fitted by Vincent. I have one on the Flash. The Speedster is the predecessor to the Speedmaster.

David
 

craig

Well Known and Active Forum Website User
VOC Member
I looked thru my catalogs and find a date of 3.50 on an Avon catalog . Only four tyres are listed - Supreme, Supreme Special, Speedster, Gripster.

Speedster3_50.jpg
 

GBewley

Well Known and Active Forum Website User
VOC Member
I received the following today from Avon Tyres. I think they missed the fact I was speaking of two separate and different tires, but I am pleased to have gotten this much! For our collective edification:

----------------------------------

3.00-20 Avon Speedster

I have delved in the archives and, Bingo, managed to find the old tyre specifications for Avon Speedster, the
earliest dating from 8th December 1933 and the latest dated 15th September 1954 when the Speedster range
was cancelled and superseded by the Speedmaster range.

Tyre sizes comprised: 3.00-19, 3.25-19, 3.50-19, 3.00-20, 2.75-21 and 3.00-21.

The simple tyre construction was 4 plies of rayon at 37.5º bias angle with a 2 up 2 down tie-in, a 3/2 bead
stack, and 1” wide fabric chafers, with a natural rubber tread.

The mould number for 3.00-20, the size in question, was 7394. The mould drawing number was TD34 and the
curebag TDS274. (An earlier version from 1941 quoted mould drawing PT8030). Interesting to note that the
mould rings were stamped 26 x 3.00.

The specifications state that two tinplate stencils were required – a serial number stencil measuring 1.25” x 5/16”
and a date code stencil measuring 1½” x 5/16” both with semi-circular ends.

Also mentioned was the requirement in the 1940’s for a stencil denoting “R” and another denoting “D” and a
sticker applied in the wrapping room to also denote “R”. (At one time finished tyres were spirally wrapped with
brown paper). It is not known what these signified.

A couple of the specifications quoted “4G26 tread reserved for HRD covers only”, I seem to remember that the
Vincent HRD was a make of motorcycle famed in the 1940’s as ‘the world’s fastest production motorcycle’ – there
may or may not be a connection.

When we look at the date codes neither “NIC” or “EIO” fit the cipher in use prior to 1956 unless there was a
different earlier cipher of which I have no knowledge. “NIC” would fit the post 1956 cipher but the tyres were
no longer in production then, and deciphering the code produces a date of June 1987 which is impossible. In the
case of “EIO” the E does not fit with the later cipher and the O does not fit with the earlier cipher. So I remain
puzzled and can only hazard a guess that these tyres were produced in the 1940’s or early 1950’s.

I could find no reference to “VA7477” and can only assume that “510152” was a serial number.

That’s about it.
 

craig

Well Known and Active Forum Website User
VOC Member
I was pleased to have been fortunate to have received an NOS AVON SPEEDSTER tire today. Not planning on road use. The two casing numbers are (EKH) and (SM4441).
My plan is to build a new front wheel and use it for Vincent Black Shadow display.
Probably get hung up on correct front rim, spokes, hubs, drums, plates, etc...............but we see.
I see the Avon's lettering painted in factory displays.
What color were these letters and how would we see or read about this in period?
2017a (2).jpg
 
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