swapping a crankset - do I need other changes?
swapping a crankset - do I need other changes?
On my Topstone, I'm looking to change the fsa 46/30 for the grx 600 46/30. I'm also going to be changing the chain. The bike has the Tiagra derailers it came with - wll they be ok wth the new chankset?
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- Joined: 9 Jun 2022, 7:19pm
Re: swapping a crankset - do I need other changes?
Should be no problem regards the derailleur, the number of teeth are the same.
Is the mount for the chainring the same?
Is the mount for the chainring the same?
Re: swapping a crankset - do I need other changes?
I think GRX double chainsets have a 2.5mm wider chainline than standard Shimano road doubles (FSA might be different), and the GRX front derailleurs are designed for that wider chainine. I don't know how significant the difference between a GRX front derailleur and a standard road front derailleur would be in practice.
Re: swapping a crankset - do I need other changes?
As per previous posts, the GRX crankset might give 2.5mm wider chainline. Might not ... because wider chainlines are becoming the norm owing to the popularity of bikes with disc brakes (wider spacing at the rear).
You'll be mighty unlucky if your Tiagra FD doesn't give enough out-swing to work properly, but you might not actually find out for sure until you fit your new crankset.
You'll be mighty unlucky if your Tiagra FD doesn't give enough out-swing to work properly, but you might not actually find out for sure until you fit your new crankset.
I should coco.
Re: swapping a crankset - do I need other changes?
Yes: https://productinfo.shimano.com/#/com?c ... acid=C-455 Scroll down to the '2x10-Speed' section.
But as described above (and in the linked Shimano tech doc) your front mech is not fully compatible. But might work.
tech doc also confirms that the bottom bracket should be fine.
Re: swapping a crankset - do I need other changes?
thanks for the replies. I've also done some reading on topstone forums and apparently it's really hard to remove the FSA one as well
Re: swapping a crankset - do I need other changes?
Do they say why?
And as a possibly now irrelevant addendum to my earlier comment about the BB - you presumably will need a new one as your existing won’t be the Tiagra version that I was reading of the tech doc.
And as a possibly now irrelevant addendum to my earlier comment about the BB - you presumably will need a new one as your existing won’t be the Tiagra version that I was reading of the tech doc.
Re: swapping a crankset - do I need other changes?
Is there a dedicated Topstone forum? If so, would you care to share the link, I am about to buy and would like to ask questions and seek some info that might be a bit specific here