C
Hello,
I've got a Trek Madone 5.2 "project one" with Ultegra 10sp (2005), and
it shipped with some unusual wheels - the stickers on the wheels say
Race-lite but they're 16 spoke, so I think they may be race-lite aeros
or some other mutant. Anyway, nice wheels, fast, light and plenty
stiff, I've put 7,000km on them and they're solid and true and roll as
nicely as anything I've ever ridden on ...
But!
The freehub body is alloy, and it's 9sp, not 10sp - when I pulled the
12-25 off to whack on a 12-27 for some big hills around here we (I work
p/t at my LBS) found that there was the 1mm spacer used for fitting
10sp cassettes on 9sp hubs. The cassette was very difficult to remove
as it had dug into the hub and we had to make up a tool to unwind it
out of the hub. Not good! There's 1mm or so deep gouges in the hub
where the sprockets have dug into it.
Looking through Sheldon's pages, I note that he says that one should
not fit a 10sp cassette on a 9sp dura-ace hub as it's alloy (the hub
body) but that it's ok with Ultegra 9sp hubs. I assume this is because
the Ultegra hub body (proper name is?) is steel. Presumably the 10sp
hub has a better fit to the cassette so it doesn't have such high
pressure points?
I'd expect that the same should apply to the Bontrager hub? Ie: Trek
should not have supplied that hub with that cassette? We're getting in
touch with Trek Australia to confirm that this is a mistake, but can
anyone here confirm that Trek should not have shipped that hub with
this bike? I'm 90% sure it's a mistake on their (Trek) part, but would
appreciate any confirmation from anyone here with a bit more experience
with this kind of thing.
I've got a Trek Madone 5.2 "project one" with Ultegra 10sp (2005), and
it shipped with some unusual wheels - the stickers on the wheels say
Race-lite but they're 16 spoke, so I think they may be race-lite aeros
or some other mutant. Anyway, nice wheels, fast, light and plenty
stiff, I've put 7,000km on them and they're solid and true and roll as
nicely as anything I've ever ridden on ...
But!
The freehub body is alloy, and it's 9sp, not 10sp - when I pulled the
12-25 off to whack on a 12-27 for some big hills around here we (I work
p/t at my LBS) found that there was the 1mm spacer used for fitting
10sp cassettes on 9sp hubs. The cassette was very difficult to remove
as it had dug into the hub and we had to make up a tool to unwind it
out of the hub. Not good! There's 1mm or so deep gouges in the hub
where the sprockets have dug into it.
Looking through Sheldon's pages, I note that he says that one should
not fit a 10sp cassette on a 9sp dura-ace hub as it's alloy (the hub
body) but that it's ok with Ultegra 9sp hubs. I assume this is because
the Ultegra hub body (proper name is?) is steel. Presumably the 10sp
hub has a better fit to the cassette so it doesn't have such high
pressure points?
I'd expect that the same should apply to the Bontrager hub? Ie: Trek
should not have supplied that hub with that cassette? We're getting in
touch with Trek Australia to confirm that this is a mistake, but can
anyone here confirm that Trek should not have shipped that hub with
this bike? I'm 90% sure it's a mistake on their (Trek) part, but would
appreciate any confirmation from anyone here with a bit more experience
with this kind of thing.