Hey Guy's,

I'm just about to build up a new to me SL4 Tarmac with 7970 Di2.

I went to the LBS and saw the new under BB battery mount on the Roubaix's. It looks like it's a simple job of removing the existing cable guide and screwing in the mount. Does anyone know the part # and cost to buy it from Specialized?

I know I can go with internal battery kit for $160, but want to keep the funds down and don't want to invest too much into what is becoming a obsolete group. Furthermore, the Specialized mount will work perfectly with my existing internal wire set-up (switching from a 2010 Madone 6.9).

Thanks,

Bill

I have the madone under BB mount laying around. Let me find it. We can work out a deal. It uses a flatter bolt head to allow the battery to slide off and on. PM me and I can send photos

Thanks for the response, but I already have the Madone under BB mount. Looking to pick-up a Specialized under mount for the Tarmac SL4 that I'm building.

Cheers, Bill

If you are using 7970 then put the battery in the seatpost or seat tube- this may not be pretty, but it's good for 1,500 km:



Total cost is ~£10

So if you are stripping the Madone, won't the Madone mount probably bolt to the Tarmac? Unless you are planning on selling the Madone... But if you are hanging on to it, just use that mount for now. If you upgrade to 9070 and E-tube wiring with internal battery in the future you can put the mount back on the Madone

Thanks for the suggestion. I might go that route. If you've seen the Specialized though, you will see that it's a nicely made mount to fit perfectly under the BB.

I do understand the appeal of those perfectly made parts. Good luck with this project!

FYI, just got the part from the LBS today.

Part#S139900038 - Msc my13 SL4 BB Electronic Mount Kit for Di2.

It replaces the shift wire guide and cleanly mounts the Di2 battery under the BB.

Would you please post a pic of it? I asked my LBS to order one of these, should be here next week.

That is pretty cool the solution including the zip tie on the SL4 is a joke. You have to post pictures and show up the install.