Page 1 of 1

Dura-Ace 9070/9100 & Oversized pulley

Posted: Mon Aug 13, 2018 10:15 am
by Ritsuke
I've found an OSPW system I'd like to use/test but I'm not sure about the fitting. Is there any difference between the 9070 (Dura Ace Di2 group which I have) and the new 9100 rear derailleur? The OSPW is designed to fit on the new group but I'm curious if I can install it on mine.

Thanks for your advice!

Dura-Ace 9070/9100 & Oversized pulley

Posted: Mon Aug 13, 2018 10:15 am
by Weenie

Re: Dura-Ace 9070/9100 & Oversized pulley

Posted: Mon Aug 13, 2018 10:43 am
by Klaster_1
I have experience with RD-9000 and RD-R9100 only, but cages of those are incompatible: RD-9000 guide pulley and cage pivot axles are not aligned on RD-9000 and aligned on RD-R9100.

Re: Dura-Ace 9070/9100 & Oversized pulley

Posted: Mon Aug 13, 2018 1:26 pm
by Ritsuke
Thanks for the heads up. Decided to go with a design I like a little less but I'm sure it fits. Retour to China is a pain so I'm not taking the chance. :p

Re: Dura-Ace 9070/9100 & Oversized pulley

Posted: Fri Sep 07, 2018 9:14 am
by Ritsuke
Allright, anyone have any experience with the Rockbros OSPW system? I can't seem to get it to work with 11-28 cassette. It keeps touching.

Re: Dura-Ace 9070/9100 & Oversized pulley

Posted: Fri Sep 07, 2018 2:45 pm
by ms6073
B-Tension adjustment? Also, if your bike does not have a direct mount derailleur hangar, I might suggest a Wolf Tooth Roadlink DM for a R9100 rear derailleur.

Re: Dura-Ace 9070/9100 & Oversized pulley

Posted: Fri Sep 07, 2018 8:00 pm
by Ritsuke
I have the 9070 derailleur. B tension all the way in, chain seems right (normal length + 3). Still touches the cassette. I find it strange.

Any here ever installed one?

Re: Dura-Ace 9070/9100 & Oversized pulley

Posted: Sun Sep 09, 2018 10:40 am
by Lewn777
This is just my opinion.
Send it back and get your money back.
I've used oversized pulleys, from new they use nice slick bearings, but very quickly they wear out, plus you only gain a watt or two at most. Shimano bearings are much better for long term endurance. Plus oversized pulleys seem more likely to cause a mechanical failure and end up with your mech in your spokes and a long walk home. In my experience Wolf tooth type extenders make shifting slower and less crisp.

Probably best for a rarely used TT bike, and then it's probably unnecessary. If oversized jockey wheels were a real gain then SRAM, Shimano or someone else would have designed them in from new, as honestly it wouldn't be hard.

Re: Dura-Ace 9070/9100 & Oversized pulley

Posted: Sun Sep 09, 2018 9:02 pm
by kode54
are both pulleys oversized? some oversized pulley systems have a smaller 12 or 14T on upper and a 17T on lower cage.
makes room for larger 28-30T cassettes.

maybe you just need to replace the top pulley with a regular teeth one to prevent proximity to cassette.
Ritsuke wrote:
Fri Sep 07, 2018 8:00 pm
I have the 9070 derailleur. B tension all the way in, chain seems right (normal length + 3). Still touches the cassette. I find it strange.

Any here ever installed one?

Re: Dura-Ace 9070/9100 & Oversized pulley

Posted: Sun Sep 09, 2018 11:41 pm
by tabl10s
Ritsuke wrote:
Mon Aug 13, 2018 10:15 am
I've found an OSPW system I'd like to use/test but I'm not sure about the fitting. Is there any difference between the 9070 (Dura Ace Di2 group which I have) and the new 9100 rear derailleur? The OSPW is designed to fit on the new group but I'm curious if I can install it on mine.

Thanks for your advice!
I have a Ceramic Speed w/9070 without problems.

Re: Dura-Ace 9070/9100 & Oversized pulley

Posted: Mon Sep 10, 2018 9:47 am
by Ritsuke
kode54 wrote:
Sun Sep 09, 2018 9:02 pm
are both pulleys oversized? some oversized pulley systems have a smaller 12 or 14T on upper and a 17T on lower cage.
makes room for larger 28-30T cassettes.

maybe you just need to replace the top pulley with a regular teeth one to prevent proximity to cassette.
Ritsuke wrote:
Fri Sep 07, 2018 8:00 pm
I have the 9070 derailleur. B tension all the way in, chain seems right (normal length + 3). Still touches the cassette. I find it strange.

Any here ever installed one?
They are indeed both oversized, 17T. Rockbros OSPW.
tabl10s wrote:
Sun Sep 09, 2018 11:41 pm
Ritsuke wrote:
Mon Aug 13, 2018 10:15 am
I've found an OSPW system I'd like to use/test but I'm not sure about the fitting. Is there any difference between the 9070 (Dura Ace Di2 group which I have) and the new 9100 rear derailleur? The OSPW is designed to fit on the new group but I'm curious if I can install it on mine.

Thanks for your advice!
I have a Ceramic Speed w/9070 without problems.
Both pulleys oversized (17T) with 11-28 cassette? :)

Re: Dura-Ace 9070/9100 & Oversized pulley

Posted: Tue Sep 11, 2018 10:31 am
by tabl10s
Ritsuke wrote:
Mon Sep 10, 2018 9:47 am
kode54 wrote:
Sun Sep 09, 2018 9:02 pm
are both pulleys oversized? some oversized pulley systems have a smaller 12 or 14T on upper and a 17T on lower cage.
makes room for larger 28-30T cassettes.

maybe you just need to replace the top pulley with a regular teeth one to prevent proximity to cassette.
Ritsuke wrote:
Fri Sep 07, 2018 8:00 pm
I have the 9070 derailleur. B tension all the way in, chain seems right (normal length + 3). Still touches the cassette. I find it strange.

Any here ever installed one?
They are indeed both oversized, 17T. Rockbros OSPW.
tabl10s wrote:
Sun Sep 09, 2018 11:41 pm
Ritsuke wrote:
Mon Aug 13, 2018 10:15 am
I've found an OSPW system I'd like to use/test but I'm not sure about the fitting. Is there any difference between the 9070 (Dura Ace Di2 group which I have) and the new 9100 rear derailleur? The OSPW is designed to fit on the new group but I'm curious if I can install it on mine.

Thanks for your advice!
I have a Ceramic Speed w/9070 without problems.
Both pulleys oversized (17T) with 11-28 cassette? :)
Yes.

Re: Dura-Ace 9070/9100 & Oversized pulley

Posted: Tue Sep 11, 2018 10:31 am
by Weenie