Shimano tiagra 9 speed triple chainrings

[TAV]

Hi I bought a bike the other day a dawes audax anyway it turned up most of the stuff on there was gone passed its sell buy date. I should have asked more questions what I need to know can I get chainrings for the chainset or should I just use it until its jumping all over the place then buy a used triple like the ones on ebay say a 105 or ultegra There's no marking on the chainrings to say what it is.

 

[TAV]

Here's the same bike.

 

[ColinJ]

I wouldn't replaced a used chainset which IS worn with a used chainset that MIGHT BE worn!

Why not buy a new triple chainset from Spa Cycles (they have some at very good prices)? I bought one of THESE and am very happy with it.

 

[TAV]

Great cheers for that

 

[ColinJ]

Here it is fitted to my best bike...

I assume that your bike has an old-fashioned square-taper bottom bracket like mine?

 

[Juan Kog]

I’m not disagreeing with Colins idea but you will have to add cost of a bottom bracket as well .
So possibly just replacement rings from Spa
edit my Tiagra 9 speed double is not square taper .
🤔 But if you’re existing B/B needs replacing . Maybe more cost effective to replace chain set and bottom bracket .

 

[Jameshow]

Here it is fitted to my best bike...

View attachment 665652

I assume that your bike has an old-fashioned square-taper bottom bracket like mine?

I thought that would be Bb30!!

Nice bike btw love the older caad bikes.

 

[Jameshow]

I’m not disagreeing with Colins idea but you will have to add cost of a bottom bracket as well .
So possibly just replacement rings from Spa

Why if it spins smoothly?

 

[Cycleops]

Why if it spins smoothly?

Spins smoothly and no side to side play you'll be fine. Square taper I'm guessing?
If you want to replace it with the more modern Shimano Hollowtech it's a straight swap and the crankset should include the BB which just screws in.
Square taper chainset will be cheaper.

 

[ColinJ]

I thought that would be Bb30!!

Nice bike btw love the older caad bikes.

No - it is 20 years old now. I think it might have been the last square-tapered CAAD model. IIRC, the CAAD6 was BB30?

 

[Juan Kog]

Why if it spins smoothly?

I was assuming the OP‘s existing B/B was the Shimano Hollow tech type and Colins replacement idea required a square taper .

 

[TAV]

Yeah the bottom bracket has a square old type bb so it will be OK. It looks great.

 

[Ajax Bay]

Here's the same bike.

Thread necromancy (coming here after the OP's Q about 'racing bikes for audaxs (sic)'.
Thank you for featuring my Dawes Giro Audax, and our hedge! I took this photo immediately on return from an end-to-end. The bike and I have since managed KSW600, Mille Pennines, LEL, WH1000, PBP, five SRs and down to the Med and back (ride/train).
I have stopped using the rack and bag and prefer a smaller saddle bag plus a frame bag (for overnights or rides >300km).
Its Tiagra 9sp triple crankset is still giving excellent service though I've replaced all three rings and the UN-55 BB a couple of time (about 20,000k each BB).

 

[Yearofthegoat]

Thanks all for the info in this thread. I've just bought an old Giant SCR 2.0 to go on the trainer and I think the rings are no longer ruling anything at all. The outer one really doesn't want to play and looks tired, the middle one doesn't have any choice but also looks ready for the big sleep. Inner one has clearly been hiding away and seems okay.

Bottom bracket seems fine, no rough spots at least (haven't dismantled it to see) so I thought I'd look for budget triple rings. So far I didn't find anything suitable, bar changing the whole shebang - until the Stronglight set mentioned above. Seems to be just the thing, at least just for an indoor trainer bike.

Cheers all!

 

[Ajax Bay]

Thanks all for the info in this thread. I've just bought an old Giant SCR 2.0 to go on the trainer and I think the rings are no longer ruling anything at all. I thought I'd look for budget triple rings. So far I didn't find anything suitable, bar changing the whole shebang - until the Stronglight set mentioned above. Seems to be just the thing, at least just for an indoor trainer bike.

If it's for the trainer you don't need a triple: a simple Spa Cycles compact or double will do you (and be way less expensive than 3 new rings). The FD won't care and the chainline won't matter.
Having said that this triple looks vfm: https://www.spacycles.co.uk/m8b0s109p2000/SPA-CYCLES-XD-2-Touring-Triple-Chainset
Crank length options, too!
NB BB spindle length recommended is 110mm and the BB you have on maybe a few mm more. But this will just affect chainline, which on a trainer matters not.