54 39t cranks

[LiamMay]

Where can i buy some 54 39t cranks ,175mm arms i have been looking all over the net cant find any ! i ride a 10 speed ultegra (merida scultura 905 (2013) )

[Duck!]

54T is a very uncommon big ring size, usually offered as an aftermarket rather than OEM option. There isn't a 54T available for Ultegra cranks, but a Dura-Ace ring will fit - it'll just look a little untidy because its shaping doesn't match the Ultegra spider.

[singlespeedscott]

It wasn't uncommon 30 odd years ago. Campagnolo Record derailleurs hated shifting into the 13 tooth sprocket so you had to resort to a 54x14

[Xplora]

Rotor crank plus chain rings? It will have to be aftermarket. It is not a very desirable combo.

[warthog1]

I'm just wondering why you need to go bigger than 53? A 53-11 is big enough for Marcel Kittel.
http://www.bikeradar.com/au/road/gear/a ... deo-39792/

[ldrcycles]

And Tony Martin uses a 58 on his TT bike http://www.bikeradar.com/au/road/gear/a ... -tt-38517/" onclick="window.open(this.href);return false;

[warthog1]

He uses that for a straight chainline on his tt bike whilst averaging 50 km/h. I'll be pretty surprised if ol mate is doing the sort of speeds where he'll be needing to chase the miniscule gains of a straight chainline.

[ldrcycles]

It all depends on cadence though, i like mine so slow you need a time-lapse video to see the pedals moving, so 53-11 is only just enough. I'm guessing the OP is in the same boat.

[warthog1]

I'm no gun, but that would not be the most efficient way to pedal. My point is the fastest riders in the world find 53-11 big enough. They will also have developed the most efficient cadence under the stress of competition.
I'm just being pedantic again/still
He might have a faired recumbent or some other work of the devil, I don't know.

It all depends on cadence though, i like mine so slow you need a time-lapse video to see the pedals moving

[ldrcycles]

He might have a faired recumbent or some other work of the devil, I don't know.

[warthog1]

He might have a faired recumbent or some other work of the devil, I don't know.

I stole that line from you talking about discs on road bikes Which I fully agreed with

[singlespeedscott]