what makes a triple crankset 9 or 10-speed?

[Gary]

I haven't seen an actual explanation of that. I am speaking of Shimano
specifically.

[daveornee[_21_]]

Gary Wrote:
> I haven't seen an actual explanation of that. I am speaking of Shimano
> specifically.
Shimano says you need 10 speed crankset to go along with their 10 speed
chain and 10 speed cassettes.
I agree that the 10 speed chain and cassette compatibility is a major
issue, but I haven't seen the major issue of a 10 speed (narrower)
chain and 9 speed crankset.
See:
http://bike.shimano.com/publish/content/cycle/sac/us/en/technical_service/compatibility_charts/road_compatibility.-MainContent-0001-DownloadFile.tmp/Front%20drive%20road%20compatibility.pdf.pdf

I guess you would need to measure and evaluate the differences in
spacing and chainwheel thickness + any shifting aid differences such as
pins on the chain rings. Besides the outer dimension of a Shimano 10
speed Vs 9 speed chain being narrower, there is a profile shaping
difference as well.


--
daveornee

[Hank Wirtz]

On Mar 16, 8:25 am, Gary > wrote:
> I haven't seen an actual explanation of that. I am speaking of Shimano
> specifically.

The main issue I've heard of is that the chain is narrow enough to
skate between the rings. I ran a 10-speed crank on an otherwise 9-
speed system for quite a while, and it never happened to me.

[[email protected]]

On Mar 16, 1:59 pm, "Hank Wirtz" > wrote:
> On Mar 16, 8:25 am, Gary > wrote:
>
> > I haven't seen an actual explanation of that. I am speaking of Shimano
> > specifically.
>
> The main issue I've heard of is that the chain is narrow enough to
> skate between the rings. I ran a 10-speed crank on an otherwise 9-
> speed system for quite a while, and it never happened to me.

I did have some problems with 9spd Bontrager triple cranksets on 10
spd systems. Enough problems that I definately wouldn't recommend
them for that application. The 9spd Bontrager double cranks worked OK
with the 10spd but the 10spd cranks definately worked better.

alan.

[Hank Wirtz]

On Mar 16, 11:59 am, "Hank Wirtz" > wrote:
> On Mar 16, 8:25 am, Gary > wrote:
>
> > I haven't seen an actual explanation of that. I am speaking of Shimano
> > specifically.
>
> The main issue I've heard of is that the chain is narrow enough to
> skate between the rings. I ran a 10-speed crank on an otherwise 9-
> speed system for quite a while, and it never happened to me.

Of course, that's 'cause I didn't have the 9sp crank/10sp chain combo
that would cause that. Duh. Nevermind.