Marauder9

I have been looking around for a while for a new crankset to upgrade my old one. Found one which looked quite cheep (wonder why ) which was a Tiagra Hollotech 2 crankset.

After ordering it I thought about looking to see why the difference in name to a normal Tiagra crankset. Am I right in thinking that I need a different type of BB which looks more expensive and tools to install said crankset?

I should of realised with the difference in name D'oh. Live and learn I guess.

Chris_W

Yep, you'll need an external-bearing bottom bracket. They should be readily available, and all Shimano road models are interchangeable AFAIK (so it doesn't matter if you can't get a Tiagra model BB).

motobecane69

yeah the outboard ultegra BB can be had for around $30

Marauder9

Thanks guys
Do you know if I need any new tools to install the BB and crank as oppposed to a normal crank on a road bike?

jimc101

You need 2 specific tools to install the BB / chainset; for the BB, an install tool, lots of companies do them, this is Shimano's

https://www.ribblecycles.co.uk/sp/roa...OL850000000000

You will also need the tool for the chainset NDS pre-load

https://www.ribblecycles.co.uk/sp/roa...OL800000000000

For the BB, any of Shimano's Road range will do, but don't use an MTB one, as they are different, one like this will work fine

https://www.ribblecycles.co.uk/sp/roa...le/SHIMBTBR710

Nothing wrong with the HT2 system or Tiagra, be happy you got one cheap.

davidad

You will need a new BB wrench. https://www.nashbar.com/bikes/Product...2_10000_202576

HillRider

Go to Shimano's web site and find their tech document link. Look up your crank set's installation sheet.

Marauder9

Thanks guys.
I will have a look at them and see if I need any new tools to go with the old ones my mate has to install cranks.