>>"meb" <
[email protected]> wrote:
>>>What is the smallest toothcount Uniglide cassette
>>>thread-on sprocket made?
> James Thomson Wrote:
>>11t for Dura Ace, 12t for everything else.
meb wrote:
>>>Since smaller sprockets tend to wear first and the threadons
>>>cannot use modified Hyperglide substitutes, are the threadon
>>>UG sprockets starting to get sparse?
> James Thomson Wrote:
>>Yes.
meb wrote:
> Have always been told the DA UG 6 was not interchangeable with the
> other UG 6 cassettes. Anyone know what the issue is- i.e. spacing,
> threads, hub diameter, etc.?
> Seems if it is spacing there must be some other combo of spacers that
> would adapt the models even if it meant throwing out one cog
> somewhere.
> FWIW my sole UG 6 cassette is Exage 300.
Mr Thomson's right.
Early DA cassette bodies (Dura Ace EX-5 #7250, DuraAce EX-6
#7260, DuraAce AX-6 #7360 and DuraAce AX-7 #7370) all had a
32mm start thread, for 11t &up.
Shimano's 600 AX-6 #6361, New 600EX-6 #6207, the classic UG
DeoreXT #M730 six speed all start with a 34.6mm thread for
12t &up only.
The later New Dura Ace #7400-6 and #7400-7 lists (pages
HB5.8, HB5.9) the cassette body as having the smaller 32mm
start thread on the cassette bodies, but Shimano supplied
high gear cogs in sizes 12 & up, no 11t.
I don't have a body to measure. Anyone with a New Dura Ace
Six or Seven CS body? It seems to me that if it's 32mm, one
should be able to work out some spacing for an early 11t cog
on those bodies.
There's no physical way to put 11t on your 34mm Exage A300
cassette body. The root tooth diameter of an 11t cog is
34mm, leaving no room for a thread at all!
--
Andrew Muzi
www.yellowjersey.org
Open every day since 1 April, 1971