Super Record EPS RD Question

Discuss light weight issues concerning road bikes & parts.
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mpower
Posts: 158
Joined: Mon May 23, 2011 4:37 pm

by mpower

Do you think a 11/32T cassette will work with it?

Permon
Posts: 640
Joined: Mon Jun 23, 2008 8:52 am

by Permon

As far as I know, 29t cog is the max for Campy RDs.

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bikerjulio
Posts: 1901
Joined: Fri Dec 11, 2009 10:38 pm
Location: Welland, Ontario

by bikerjulio

There's a 2-part answer to the question.

One is the issue of cage length and the amount of chain to be taken up in going from big-big to small-small. The maximum safe number for a short cage RD is 30 teeth total. So the 11-32 has an 21T range and a 39-53 crankset has 14T for a total of 35T or well in excess of what the RD can handle. With a compact on front, it's worse of course. So, it requires a medium cage RD and It does not look like such a thing is available in EPS.

Second is the issue of upper pulley clearance from the big sprocket. Campy do make a 12-30 in 10-speed (which I have), and there is sufficient clearance. And here I'm assuming that the basic RD geometry is the same, which I believe to be so. So, it's possible there may be clearance, but it's going to come down to individual frame and hanger differences.

This is a long way of saying that I don't believe it's possible to do with standard EPS. Wider range gearing is possible with Athena mechanical which does offer a medium cage RD, so just maybe a cage swap is possible, I don't know.
There's sometimes a buggy.
How many drivers does a buggy have?

One.

So let's just say I'm drivin' this buggy...
and if you fix your attitude you can ride along with me.

http://www.youtube.com/watch?v=GekiIMh4ZkM

Causidicus
Posts: 325
Joined: Tue Apr 17, 2012 11:20 am

by Causidicus

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Last edited by Causidicus on Wed Jun 18, 2014 1:38 am, edited 1 time in total.

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bikerjulio
Posts: 1901
Joined: Fri Dec 11, 2009 10:38 pm
Location: Welland, Ontario

by bikerjulio

Causidicus wrote:Could put the long cage Athena 11 triple cage on the EPS RD. Still might not clear a 32 without a longer hanger.


isn't that what I said??
There's sometimes a buggy.
How many drivers does a buggy have?

One.

So let's just say I'm drivin' this buggy...
and if you fix your attitude you can ride along with me.

http://www.youtube.com/watch?v=GekiIMh4ZkM

mjduct
Posts: 662
Joined: Tue Dec 27, 2011 2:19 pm

by mjduct

What is your front end, if you are running a single ring you can make it work :)


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Causidicus
Posts: 325
Joined: Tue Apr 17, 2012 11:20 am

by Causidicus

.

mikey168
Posts: 21
Joined: Fri Apr 24, 2015 1:38 am

by mikey168

I have tried this (11-32 sram force with SR EPS rear mech) on my trainer...

The results are just not consistently reliable enough (only successfully half the time), plus the stress on the chain would be too much...

If you nurse it VERY CAREFULLY and (I mean very) it will shift on the big-big combo. However when shifting out on the road, it's just not practical.... Don't risk it, it's not worth the trouble

Hope this helps

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sugarkane
in the industry
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Joined: Wed Jan 19, 2011 11:14 am
Location: SYD
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by sugarkane

Shoot me an email. I have a way that should work!

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