CeramicSpeed OSPW touches cassette

Discuss light weight issues concerning road bikes & parts.
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Ritsuke
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by Ritsuke

Hello,

I have a problem with my OSPW as it touches my cassette.

Setup: CeramicSpeed OSPW, 11-28, 52-36, Dura Ace 9000 Di2, S-Works Tarmac SL5

Every combination works except the 28. My OSPW upper pulley touches the sprocket. The B-tension screw is maxed out so that couldn't be it. Do I need another derailleur hanger (which one?) or another solutions?

Thanks!
Last edited by Ritsuke on Sun Feb 09, 2020 10:20 am, edited 1 time in total.
S-Works Tarmac SL5
Retired: Specialized Allez Sprint Red Hook Crit

RECAR77
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Joined: Mon Jun 10, 2019 7:12 am

by RECAR77

The one with the two 17t pulleys has a capacity of 28t

53-39=14

28-14=14

11+14=25

The one with 13/19t pulleys has a 32t capacity which is the one you need

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by Weenie


Attermann
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Location: Denmark

by Attermann

the 17/17 version is for 6800 and 9000

the 13/19 is for 8000 and 9100

that's at least the way i understand it.

RECAR77
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Joined: Mon Jun 10, 2019 7:12 am

by RECAR77

Attermann wrote:the 17/17 version is for 6800 and 9000

the 13/19 is for 8000 and 9100

that's at least the way i understand it.
Ah, yeah my bad

OP, have you put the p-axle in the hole in the cage that results in the most tension?

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Ritsuke
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by Ritsuke

Correct, I have the 17/17 version for 9000 so that should be good.
I have put the tension in the middle axle as advised for di2. Should I put it in max tension?
S-Works Tarmac SL5
Retired: Specialized Allez Sprint Red Hook Crit

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Ritsuke
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by Ritsuke

No one have an idea?
S-Works Tarmac SL5
Retired: Specialized Allez Sprint Red Hook Crit

ghostinthemachine
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Joined: Thu May 07, 2015 9:18 pm

by ghostinthemachine

Is the chain too long?
If it is, the cage might not rotate round it's pivot far enough for the top jockey wheel to clear the 28t sprocket. Unless the jockey is centred on the pivot like the SRAM mechs are. Then it'll make no noticeable difference.

And, do all the other pivots in the mech move freely?

alcatraz
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Joined: Mon Aug 29, 2016 11:19 am

by alcatraz

If it works in the small chainring and not big chainring it's the chain length that causes the problem in the big ring.

Check how far back the cage pivots in the small/small gear combination. If it doesn't bottom out you could have some space for a longer chain.

Also don't just bottom out the B-screw. Ideally this should be in the ballpark when the chain is sized so you don't compound errors and get the wrong chain length. Depends on how you size the chain but to safely take modifications (like ospw, etc) into account you basically need to size in small/small combo and go as long as possible. You'll end up with less friction but if the chain is too slack and slaps chainstays or small cogs won't shift you might need to take a link out. Still easier than to "put a link back in" :lol:. (assuming you use quick links)

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Ritsuke
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by Ritsuke

Thanks, I'll check it out. But if I understand correctly you're saying my chain is too short at the moment?
S-Works Tarmac SL5
Retired: Specialized Allez Sprint Red Hook Crit

by Weenie


alcatraz
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Joined: Mon Aug 29, 2016 11:19 am

by alcatraz

Yes, I and another poster suspect that.

A picture with the combo in small/small and small/big would help. (front/rear)

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