New 105 chainset

Rustybucket

Veteran
Location
Staines
I'm thinking of upgrading my chainset to Shimano 105 on my Boardman carbon road bike. It currently has an fsa gossamer. Would I also need to buy a new bottom bracket? If so which one would be best?

Thanks for any help
 
Location
Loch side.
No you won't. Both crank spindles are 24mm in dia. There is a cautionary note though, if you are swapping out triple chainring cranks, make sure the tooth count on all the chainrings are the same. The Shimano FD is very fussy that way and won't tolerate a mix-and-match approach to sprocket sizing.

However, the upgrade is a waste of money and you will only fool yourself that the one is better than the other. Put the money in your pension fund.
 
OP
Rustybucket

Rustybucket

Veteran
Location
Staines
No you won't. Both crank spindles are 24mm in dia. There is a cautionary note though, if you are swapping out triple chainring cranks, make sure the tooth count on all the chainrings are the same. The Shimano FD is very fussy that way and won't tolerate a mix-and-match approach to sprocket sizing.

However, the upgrade is a waste of money and you will only fool yourself that the one is better than the other. Put the money in your pension fund.
Thanks for your help. I'm really only changing it as I had the large chaining replaced last year to a horrible cheap looking one. I'm really only doing it for the aesthetics and everything matches. I know it won't make too much difference performance wise!
Thanks again
 

Smokin Joe

Legendary Member
Thanks for your help. I'm really only changing it as I had the large chaining replaced last year to a horrible cheap looking one. I'm really only doing it for the aesthetics and everything matches. I know it won't make too much difference performance wise!
Thanks again
Performance, no gain as said. But if aesthetics matter then go for it.
 
Location
Loch side.
Thanks for your help. I'm really only changing it as I had the large chaining replaced last year to a horrible cheap looking one. I'm really only doing it for the aesthetics and everything matches. I know it won't make too much difference performance wise!
Thanks again
Nothing wrong with acquiring purely for beauty. I married that way so can't criticize someone buying a mere crank for looks. It is infinitely cheaper than my choice.
 

uclown2002

Veteran
Location
Harrogate
Just to satisfy my curiosity, I thought the 105 was a HTII type bottom bracket and fsa gossamer a press fit BB? If so, wouldn't an adapter be needed?
 

adscrim

Veteran
Location
Perth
Thanks just need to decide which colour to get, silver or black? I'm thinking black would look best
I suspect your Boardman has a GXP bottom bracket which I think uses an axle that steps down from 24mm at the drive side bearing surface to 22mm at the non-drive side. I could be wrong of course but best check before making a purchase.
 
Location
Loch side.
I suspect your Boardman has a GXP bottom bracket which I think uses an axle that steps down from 24mm at the drive side bearing surface to 22mm at the non-drive side. I could be wrong of course but best check before making a purchase.
Nah! FSA doesn't use GXP, it is proprietary to SRAM and hopefully it never escapes quarantine and infest the world with its stupid patent-dodging design.
 
Location
Loch side.
I'm getting confused now! I'm going to buy one this weekend at cycle surgery and just get them to fix it. If I need a new BB then they can fix it too.
You don't need a new crank. Go for a long ride this weekend and have a beer afterwards. You'll forget about the crank. It isn't about the bike.
Years ago I used to have a serious photography hobby. My friends and acquaintances used to come and show me their new cameras. I always told them that I'd prefer to see their photos. Nowadays I feel the same about bicycles. Don't show me your new crank, lets go for a ride instead.
 
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