Compatibility question.

darrell1967
darrell1967 Posts: 470
edited December 2021 in Workshop
I’m building a Spesh TT bike and I’m wondering if a 10 speed Tiagra 4700 set-up will work with 10 speed SL-BS79 Dura Ace bar end levers.

Thanks.

Comments

  • jpj84
    jpj84 Posts: 51
    I think the 4700 stuff is incompatible with other shimano 10 speed - a 9 speed Sora mech would probably be compatible however
  • Mad_Malx
    Mad_Malx Posts: 5,105
    10s Tiagra components are limited in compatibility. Works with 10s tiagra, and (I think) 11s 105/ultegra/da.
    10sp DA shifters will work with 10sp 105 or 10s Ultegra derailleur. Will also work with Shimano 9s road or mtb derailleur. not 10s mtb.




  • darrell1967
    darrell1967 Posts: 470
    edited December 2021
    Mad_Malx said:

    10s Tiagra components are limited in compatibility. Works with 10s tiagra, and (I think) 11s 105/ultegra/da.
    10sp DA shifters will work with 10sp 105 or 10s Ultegra derailleur. Will also work with Shimano 9s road or mtb derailleur. not 10s mtb.




    Thanks. I think the 6600 Ultegra is 10 speed.

    I’m so tempted to build it into a road bike. It’s a Specialized Transition Comp.

  • What about Dura Ace 9000 11 speed bar end gear levers and 11 speed Ultegra?
  • darrell1967
    darrell1967 Posts: 470
    edited January 2022
    jpj84 said:

    I think the 4700 stuff is incompatible with other shimano 10 speed - a 9 speed Sora mech would probably be compatible however

    Just been following a Specialized Transition on eBay that uses Tiagra 4700 and the Dura Ace levers that I mentioned in my initial post.
    I messaged the seller about them working together and he replied saying they run as smooth as silk and were actually fitted to the bike when he bought it.

    https://www.ebay.co.uk/itm/Specialized-Transition-Expert-TT-Road-Bike-Medium-54cm-/125070415280?mkcid=16&mkevt=1&_trksid=p2349624.m46890.l6249&mkrid=710-127635-2958-0

    Although reading elsewhere tells me it doesn’t.
  • Wheelspinner
    Wheelspinner Posts: 6,610

    Mad_Malx said:

    10s Tiagra components are limited in compatibility. Works with 10s tiagra, and (I think) 11s 105/ultegra/da.
    10sp DA shifters will work with 10sp 105 or 10s Ultegra derailleur. Will also work with Shimano 9s road or mtb derailleur. not 10s mtb.




    Thanks. I think the 6600 Ultegra is 10 speed.

    I’m so tempted to build it into a road bike. It’s a Specialized Transition Comp.

    Hmmm, have you ridden a TT bike? They usually make horrible road bikes, thanks to geometry mainly. Designed to be low front, aero in straight lines, and not really for hills or corners. They handle badly and are usually relatively heavy, and uncomfortable unless you are actually on the aero bars.
    Open One+ BMC TE29 Seven 622SL On One Scandal Cervelo RS
  • secretsam
    secretsam Posts: 5,117

    What about Dura Ace 9000 11 speed bar end gear levers and 11 speed Ultegra?

    That's probably fine.

    It's just a hill. Get over it.
  • woodywmb
    woodywmb Posts: 669
    From what I see on the Shimano compatibility archive site, 10 spd Dura Ace bar end shifters will pull the gear cable to match the RD up suitably with 10 speed cassettes - the cogs are 3.95mm apart (Inc cog width of 1.6). This is the same spacing spec as current Tiagra 10spd cassettes. The compatibility doesn't work out if you change to 11 speed.
  • woodywmb said:

    From what I see on the Shimano compatibility archive site, 10 spd Dura Ace bar end shifters will pull the gear cable to match the RD up suitably with 10 speed cassettes - the cogs are 3.95mm apart (Inc cog width of 1.6). This is the same spacing spec as current Tiagra 10spd cassettes. The compatibility doesn't work out if you change to 11 speed.

    So does that all mean that I can use Shimano Tiagra RD4700 and Shimano BL-SL79 bar end levers??
  • Gonna have to build it into a road bike now. My Dolan got nicked off a job this morning.
  • Mad_Malx
    Mad_Malx Posts: 5,105

    woodywmb said:

    From what I see on the Shimano compatibility archive site, 10 spd Dura Ace bar end shifters will pull the gear cable to match the RD up suitably with 10 speed cassettes - the cogs are 3.95mm apart (Inc cog width of 1.6). This is the same spacing spec as current Tiagra 10spd cassettes. The compatibility doesn't work out if you change to 11 speed.

    So does that all mean that I can use Shimano Tiagra RD4700 and Shimano BL-SL79 bar end levers??
    I don't think so.
  • Mad_Malx said:

    woodywmb said:

    From what I see on the Shimano compatibility archive site, 10 spd Dura Ace bar end shifters will pull the gear cable to match the RD up suitably with 10 speed cassettes - the cogs are 3.95mm apart (Inc cog width of 1.6). This is the same spacing spec as current Tiagra 10spd cassettes. The compatibility doesn't work out if you change to 11 speed.

    So does that all mean that I can use Shimano Tiagra RD4700 and Shimano BL-SL79 bar end levers??
    I don't think so.
    Change of plan now anyway. See my earlier post. ☹️