Crankset help

SME
SME Posts: 348
edited May 2016 in Workshop
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Left to right Trek Domane 2.3, Apollo TDF.02, and a Viking (my son's first road bike)

My son wants to swap his chainset for a compact... I want to swap the RS500 on the Trek for a 5800 series 105 (this would complete the whole groupset, having changed the brakes earlier).

I believe the RS500 and the 105 5800 are both 'hollowtech' - would this be a straight swap?

I intend to put the RS500 on the Apollo. To do this swap am I right to believe I will need any of these...?
(judging from what I can see on this thread... viewtopic.php?f=40042&t=13062455

http://www.sjscycles.co.uk/kcnc-bb30-bo ... prod33009/

http://www.wiggle.co.uk/shimano-tiagra- ... cket-cups/

http://www.chainreactioncycles.com/shim ... lsrc=aw.ds

This would free up the compact on the Apollo for my son to have (both are square tapered BB).

Have I done my homework right - any help or comments would be appreciated.
Thanks,
Steve

Comments

  • imposter2.0
    imposter2.0 Posts: 12,028
    Assuming all those frames have 68mm threaded BB shells, then any of those cranksets will fit on any of those bikes, provided you swap the BBs over as well. Not sure why you are linking to a BB30 adaptor, as I doubt if any of those bikes in the pic are on BB30..
  • dgunthor
    dgunthor Posts: 644
    Hi,

    Yes, the 5800 will fit on the trek no problem - you can use the existing hollowtech BB if you like, the newer types have less friction is all, they are compatible.

    The RS500 will fit on the apollo, just need a hollowtech BB.

    (No need for any BB30 adaptors - that's a wider bottom bracket standard that you don't have)
  • SME
    SME Posts: 348
    Imposter wrote:
    Assuming all those frames have 68mm threaded BB shells, then any of those cranksets will fit on any of those bikes, provided you swap the BBs over as well. Not sure why you are linking to a BB30 adaptor, as I doubt if any of those bikes in the pic are on BB30..

    Yeah, sorry. One of the links is just for cups. The Trek's bottom bracket is about 84mm wide and the bearings seem to be pushed in - won't be swapping those out!
    dgunthor wrote:
    Hi,

    Yes, the 5800 will fit on the trek no problem - you can use the existing hollowtech BB if you like, the newer types have less friction is all, they are compatible.

    The RS500 will fit on the apollo, just need a hollowtech BB.

    (No need for any BB30 adaptors - that's a wider bottom bracket standard that you don't have)

    Sorry, I'm know I'm stupid when it comes to this, hollowtechs I haven't quite got my head around. Cartridge bottton brackets are still new tech to me - I'm still in a world of cups, ball bearings, and cotter pins!

    So, just a recap...
    The Apollo has a 68x113 cartridge bearing. To fit the RS500 all I need is, say, swap it for the Shimano 6800 bottom bracket?

    http://www.chainreactioncycles.com/shim ... 382f49d0b5

    Thanks both,
    Steve
  • dgunthor
    dgunthor Posts: 644
    SME wrote:
    So, just a recap...
    The Apollo has a 68x113 cartridge bearing. To fit the RS500 all I need is, say, swap it for the Shimano 6800 bottom bracket?

    http://www.chainreactioncycles.com/shim ... 382f49d0b5

    Thanks both,
    Steve

    Yes, just a 6800 bottom bracket, spot on

    (edit: and check the crankset spins freely - if not the axle isn't straight as the outside faces of the bottom bracket shell need facing (make them nice and flat - local bike shop job - cartridge bottom brackets don't press up against the face so it doesn't matter, but hollowtech do))
  • SME
    SME Posts: 348
    dgunthor wrote:
    SME wrote:
    So, just a recap...
    The Apollo has a 68x113 cartridge bearing. To fit the RS500 all I need is, say, swap it for the Shimano 6800 bottom bracket?

    http://www.chainreactioncycles.com/shim ... 382f49d0b5

    Thanks both,
    Steve

    Yes, just a 6800 bottom bracket, spot on

    (edit: and check the crankset spins freely - if not the axle isn't straight as the outside faces of the bottom bracket shell need facing (make them nice and flat - local bike shop job - cartridge bottom brackets don't press up against the face so it doesn't matter, but hollowtech do))

    Thanks dgunthor
  • dj58
    dj58 Posts: 2,221
    Just to add your Trek has a pressfit bottom bracket, most likely a Shimano to match the RS500, all you need to do is remove the RS500 and replace with the 105 5800, very easy to swop over.
  • SME
    SME Posts: 348
    Cheers DJ. I did kinda guess that it might be a 'pop out, pop in' jobby. Nice to know though - still gaining experience and knowledge here.

    Thanks for all posters help.
    Steve