Fitting SLX FC-M660 Chainset with BB70

jonnyboy77

Over the weekend I removed my old FSA Powerdrive/Alphadrive BB and chainset from my Kona, and I started the process of replacing this with an SLX/BB70 setup using Hollowtech II.

I had my LBS face the BB shell and they also fitted the BB for me, but I was wanting to get my hands dirty as much as possible so opted to take over and fit the chainset and put the bike back together. However I've started to run into some issues/concerns about the fit of the cranks.

I've looked here for some inspiration:
- Park Tools http://www.parktool.com/blog/repair-help/external-bearing-crank-systems-hollowtech-ii-megaexo-giga-x-pipe-x-type-campagnolo-ultra-torque
- Hope tech videos http://www.youtube.com/watch?v=UAqAanDsAKA
- Shimano Techdoc http://www.shimano.com/media/techdocs/content/cycle/SI/SLX/SI_6PZFA_002/SI-6PZFA-002-En_v1_m56577569830647029.pdf

But I'm still not sure. basically; the cranks were harder to fit than I expected, i.e. they didn't just slide right in despite being well greased. I discovered a number of sources that said a light tap with a nylon hammer would tease them in, and sure enough that did the trick.

Now I'm pretty sure I have the drive side of the cranks nicely up to the bottom bracket, but there doesn't look to be a lot of the shaft showing on the non-drive side, i.e. the shaft doesn't go all the way to the end of the non drive side crank arm.

I've taken some pictures to try and illustrate:

The drive side:



The non drive side: (note the gap between the edge of the arm and the shaft)



overview:



Hopefully this illustrates what I'm driving at? I just want to be sure (fill knowledge/experience gap!) before going back to the shop for help.

Let me know if more info is needed.

Thanks

Jon

nicklouse

drive side should seat against the bearing. if no hit it more.

what is the BB shell width? 68mm should have the spacers as shown. a 73mm should only have one on the drive side.

jonnyboy77

Hmm, Kona list this as 73mm BBS

http://www.konabikeworld.com/09_cindercone_u.cfm

Too many spacers?

1mancity2

Your driveside looks like it could tap in a bit more?

Put in the plastic adjuster nut and tighten making sure you have the little spacer flicked out so the retention pin allows the arm to move.

Just check your BB shell 68mm? (measure the tube between the spacers as in your third pic) the BB is setup for a 68mm bottom bracket shell.

1mancity2

jonnyboy77 wrote:

Hmm, Kona list this as 73mm BBS

http://www.konabikeworld.com/09_cindercone_u.cfm

Too many spacers?

One on drive side only for 73mm

jonnyboy77

1mancity2 wrote:

jonnyboy77 wrote:

Hmm, Kona list this as 73mm BBS

http://www.konabikeworld.com/09_cindercone_u.cfm

Too many spacers?

One on drive side only for 73mm

Now I see that that in the Shimano Techdoc ... I should be able to remove the BB cups, correct the spacers and re-assemble, right? I have the BBT-9 tool.

Thanks for the quick/concise help, I was doubting myself a fair bit to be honest, having only ever dealt with sq. taper setups before now.

Thanks, Jon

1mancity2

Yeah just unscrew following the arrows on the bb cup and replace, sorted

jonnyboy77

Thanks folks, much appreciated.

Jon

jonnyboy77

Took it back to LBS who were most apologetic, too many spacers! They fixed the BB and finished the chainset install too.

Thanks for all the pointers, I've learned from it.

Jon