Hollowtech 2 axle length

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djnotts
Posts: 1169
Joined: 26 May 2008, 12:51pm
Location: Nottingham

Hollowtech 2 axle length

Postby djnotts » 8 Sep 2019, 9:34am

Apologies if not very "technical". Are all road H2 Axle lengths the same? My recent model KTM came with latest Tiagra triple chainset on a press fit b/b. This has assymetric 4 arm for inner ring so I can't fit a 26 to replace the 30. Will any Shimano road triple from last few years fit using same spacers as currently in place?

keyboardmonkey
Posts: 637
Joined: 1 Dec 2009, 5:05pm
Location: Yorkshire

Re: Hollowtech 2 axle length

Postby keyboardmonkey » 8 Sep 2019, 10:04am

That’s the idea. The Shimano 105 (5703) seems to be one of the last good quality triple chainsets with a BCD that allows a smaller-than-30 inner ring. You can still get black ones if you want to almost-match the 470x series greyish groupset.

NetworkMan
Posts: 645
Joined: 25 Aug 2014, 11:13am
Location: South Devon

Re: Hollowtech 2 axle length

Postby NetworkMan » 8 Sep 2019, 10:19am

Don't delay if you want one. I suspect they are fast disappearing. There was a cheap new one on ebay a while ago and Rose bikes have a 170 mm one at £96.11 plus postage.
https://www.rosebikes.co.uk/shimano-105 ... set-443978
If you don't get one of these you may well have to buy secondhand, buy something exotic at crazy prices or change to square taper!

djnotts
Posts: 1169
Joined: 26 May 2008, 12:51pm
Location: Nottingham

Re: Hollowtech 2 axle length

Postby djnotts » 8 Sep 2019, 11:32am

Thanks both. Aiming for 2nd hand, but as implied quite thin on the ground!

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TrevA
Posts: 2101
Joined: 1 Jun 2007, 9:12pm
Location: Nottingham

Re: Hollowtech 2 axle length

Postby TrevA » 11 Sep 2019, 8:15am

I was wondering about this too. I’d like to reuse the Tiagra 4603 triple chain set from my now defunct Trek Domane which is a pressfit BB, to another bike using the external BB bearings.

djnotts
Posts: 1169
Joined: 26 May 2008, 12:51pm
Location: Nottingham

Re: Hollowtech 2 axle length

Postby djnotts » 11 Sep 2019, 8:50am

Bought a claimed as new 105 already fitted with a 24T inner for 80 quid. We shall see....