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Shimano 10 speed info(5 posts)

Shimano 10 speed inforussw19
Jun 25, 2003 4:29 PM
For anyone interested, I talked to a friend of mine who works at Shimano as their top NORBA mechanic. I asked him a few questions about Dura-Ace 10 speed. Here's the word for those of you worried about your current 9 speed boutique wheels. 10 speed cogs will fit on 9 speed wheels, but 9 speed cogs will not fit on 10 speed wheels. But if you have a set of wheels now that you like, or are planning to get a new set this year, you will be able to use them next year if you go Dura-Ace 10 speed.

The anticipated time table for it's release will be OEM in September and aftermarket by Oct. or Nov.

At least that's the current word...

re: Shimano 10 speed infodivve
Jun 25, 2003 11:53 PM
I've seen a couple of occurrences now of the new cranks with a traditional looking large chainring...perhaps I could get used to that...I'm still very tempted to go Record on a new bike next year though. Not that I'm all into looks, but having something that I find truly ugly on my bike is hard for me to deal with:) BTW, the new shifters look pretty goofy as well.
sure it's not the other way??C-40
Jun 26, 2003 4:56 AM
Shimano splines are quite shallow, obviously not originally designed with the idea of using an aluminum cassette body.

It would make sense to deepen the splines for greater durability. This would allow shallow-splined 9-speed cogs to be used on 10 speed wheels, but the deeper splined 10-speed cogs would not fit on old 9-speed wheels. This is all assuming that the spline pattern remained unchanged.

This is the same thing that happened when campy changed to 9/10 speed. The new cassettes wouldn't fit on the older cassette body. The new spline pattern was made deeper (and uniquely shaped) for greater durability with an alumimun body.
sure it's not the other way??russw19
Jun 26, 2003 8:14 AM
I was told that older 9 speed wheels would still be compatible with 10 speed cogs. But you would not be able to use 9 speed cogs on a newer 10 speed wheel (why would you buy the brand new stuff to use old cogs on it anyways?)

I didn't ask if the spline was changed at all. I can and will get back to you, but my friend is on the road at NORBA and 24 hour events, so it takes a few days for him to get back to me...

I will post more as I find out more...

But the good news is that September is not that far away.

well then.....Rusty Coggs
Jun 26, 2003 2:38 PM
....wouldn't the shallow 9 speed cassette notches still potentially tear up the 10 speed aluminum splines. Seems to be a case of 6 or one and 1/2 dozen of the other.