Just as the new 12-speed Dura-Ace R9200 groupset starts to actually turn up in bike shops and on the occasional top-tier bike, CeramicSpeed is ready with an OSPW upgrade to make your new 12-speed Di2 rear derailleur faster. Apparently, they’ve been running around like crazy since the new semi-wireless 2×12 groups were introduced just over two months ago, leaning on their deep industry connections to actually get ahold of the new derailleur, then complete groupset for development and full-scale lab & road testing. And now, it’s ready…

CeramicSpeed OSPW upgrade for Shimano Dura-Ace R9200

CeramicSpeed OSPW system upgrade for Shimano Dura-Ace R9200, for RD-R9250 Di2 rear derailleur

c. CeramicSpeed

CeramicSpeed continues to promote their Oversized Pulley Wheels System, saying it’s been proven to be the fastest pulley system in the world.

As in past OSPW upgrade kits for Dura-Ace, this new generation uses a 13-tooth upper and 19-tooth lower pulley wheel spinning on CeramicSpeed’s own ceramic bearings mounted to a tweaked carbon composite derailleur cage. CeramicSpeed says the new Shimano Dura-Ace Di2 9250 derailleur required small but key functional tweaks to their cage for full compatibility and the reduced spring tension that goes a long way towards reducing drivetrain drag…

Free Watt gains (well not really free)

CeramicSpeed OSPW upgrade for Shimano Dura-Ace R9200, riding

CeramicSpeed again makes pretty bold performance claims for their OSPW system, offering 30-60% power savings vs. the stock Shimano 9200 derailleur, “or more in some cases“. They also promise their “oversized pulley wheels have 3-5 times longer lifetime than the commonly used standard pulleys on the market“, although that doesn’t specifically refer to Dura-Ace’s own standard pulleys.

CeramicSpeed OSPW Dura-Ace – Pricing, availability & options

CeramicSpeed OSPW upgrade for Shimano Dura-Ace R9200, RD-R9250 Di2 complete red

Technically, CeramicSpeed has now launched the Dura-Ace 9200 OSPW upgrade, but you’ll have to wait another two weeks to fork over your hard-earned cash for one. And it will cost you… 50o€ extra for the “standard” ceramic bearing version with hardened steel races or 590€ if you want to the even-faster “Coated” version that adds a long-wearing, low-friction metallic coating to those steel bearing races. Either way, it includes the easy-to-swap complete OSPW System with red or black pulleys, and a 15ml bottle of low-friction CeramicSpeed bearing oil.

All on top of the Dura-Ace derailleur itself, which we’ve seen advertised for anywhere from 699-815€ (actual retail of $815 / 870€.)

As of now, this new CeramicSpeed OSPW setup is only compatible Dura-Ace R9250, not with the equally new 12-speed Ultegra 8170. But, word is that some additional tweaks are in the works for a separate new Ultegra version, as well.



  1. MikeP on

    Who can handle the cognitive dissonance of pairing watt-saving, durability-enhancing oversized pulleys with… a 10-tooth cog?

  2. Eggs Benedict on

    I just watched Hambini’s dissection of Absolute Black’s carbon cage OSPW offering. That was brutal. It was an absolute pile.

  3. Topreal on

    What a relief for CeramicSpeed that Shimano has yet again neglected to address this massive design oversight in their latest top tier groupset. Especially given all the watts of output that are being burned up uselessly with normal DuraAce jockey wheels. I swear you can even see them heating up and emitting a subtle glow from all the extra friction compared to these.

    Tragically for us consumers, Shimano just can’t find the budget to employ the galaxy brain engineering talent that CeramicSpeed has managed to source. Maybe SRAM can scoop these guys up before the next redesign cycle and they can “oversize” that 10-tooth cog they expect us to sprint on.

    But seriously folks, this has got to be the biggest joke in the entire cycling tech industry right now. How do they manage to keep a straight face?

  4. Crash Bandicoot on

    Always surprised there are enough people with 400+ watt ftps, perfect tolerance frames, and aerodynamically perfect bike fits who can actually take advantage of these minute watt savings to justify a production run.

  5. WorkOnSunday on

    here’s an interesting one. shimano entry level groupset Altus M310 comes with extra large jockey wheel while their higher end dont. i wonder why that is. Anyway, i dont have much watts, i care more about less chain slap and unable to put down power than saving every last %


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