Dura Ace 7400 Cranks

[bigman]

Can these or should I say the rings work with ultegra 10 speed? I think not but am hoping someone nows for sure.

Thanks

[bigman]

Knows

[stevep]

work fine.
i use them on 3 bikes
2 have 10 spd.
1 has 9...
hmmm, maybe 2 have 9 and 1 ten?
anyway, works fine

[KJMUNC]

I stand corrected.....sounds like SteveP knows from experience.

[dirtdigger88]

10spd chain is narrower, so I don't think the rings will work, but not sure about the cranks, assuming your mount new 10spd rings. Will the new style of rings fit on 7400 cranks?


I have run 9 speed rings with a 10 speed chain on my kirk for over a year with no issues- h*ll I even run 9 speed cassettes at times-

and yes the new rings will fit the older cranks-

now speaking of . . . . someone find me a set of NOS 7410s in 175- THANKS

Jason

[bigman]

Great news- anyone need some older 105 shifters , 7 spd d ace cog, 8 spd dura ace cog, 8 spd ultegra shifters (right is new).

Henry

[stevep]

work fine.
i use them on 3 bikes
2 have 10 spd.
1 has 9...
hmmm, maybe 2 have 9 and 1 ten?
anyway, works fine

correction
reading this again.
the 9 spd cranks i am interchanging are 7700 model... w/octalink bb.
these i use interchangeably w/ 10 spd.
the 7400 are the old ones..sq taper....think it will still work ok but its not what i have used.

[dirtdigger88]

the 7400 are the old ones..sq taper....think it will still work ok but its not what i have used.

its all about the bolt pattern- not the cranks/ bottom bracket interface

Jason

[bigman]

I was asking if the older rings can work with 10 speed - if not I will look to purchase a new set of cranks.

Henry

[stevep]

its all about the bolt pattern- not the cranks/ bottom bracket interface

Jason

to clarify from here.
not the bolt pattern. they are the same. theya re 130.
i am thinkiing about the width of the spacing of the rings.
the 7400 is 8spd, right?
i still thk it should work but have not used that.

[dirtdigger88]

agreed- I misunderstood the original question

as I understand it- the difference between a 9 and 10 speed chain is in the width of the plates - not the "hole"

I KNOW 9 speed rings work with 10-

I DO have some 8 speed rings that I could mount on my Kirk and we can find out for sure- but I do use DT shifter AND friction- so I can make just about any combo work it I want to -

I say try it and report back-

Jason

[musgravecycles]

now speaking of . . . . someone find me a set of NOS 7410s in 175- THANKSJason

:p

I've got a NOS 177.5 and BB you could have...

[bigman]

Picked up some Ultegra 6600 brifters, cassette and derailleurs should have them in around a week - will build up my new to me Waterford built Paramount with a late 80's Landsharkish paint job and let you know.
And yes I am keeping the steel fork!

Thanks again

[Grant McLean]

Can these or should I say the rings work with ultegra 10 speed? I think not but am hoping someone nows for sure.

Thanks

Bigman,

I'm still not 100% sure of the question.

All chainring teeth are exactly 2mm wide. What changes between 7/8/9/10
is the distance between the inner and outer rings. Since the 10sp chain
is narrower than and 8sp chain, the rings are closer together.

If you run a 10sp chain on a 7400 8sp crank with 8sp rings, the narrow
10sp chain can get caught and jam between the rings. Shifting from the
outer to the inner is where the hitch can occur.

If you want to run 7400 cranks with 10 sp, i think you can put a 10sp shimano
inner ring on there and be ok. If you want to put 7400 rings on a 10sp
crank, the outer should work, the spacing of the inner isn't ideal.

-guranto

[Brian Smith]

The 7400 crank is actually Pre-1990, and was intended for 6-speed Dura-Ace group use. The same crank forging, with different rings, called the 7402, then 7403, barely allowed front derailer clearance for 8-speed use, especially with STI, on flimsy 28.6mm DT frames. Throw in a larger diameter down tube and bets were ever further off. The 7400 did not even have SuperGlide chainrings, let alone SG-X chainrings (with timed pins in them). People may accept different levels of shifting and/or indexing performance as satisfactory, but there is no way I would suggest either this crankset, the crank itself, nor the chainrings for use with Ultegra 10-speed front shifting.
There are things you can do, if you NEED to use this crank, to make it work as best as possible to get you down the road "for a minute," but if this is a shopping-related question, please keep shopping!