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Swapped out the factory Dura Ace "standard" crankset on my LOOK bike a while back for a compact... with shorter arms... and just got around to listing the original today.

The crank is in good condition and works with a standard Shimano Hollowtech II style bottom bracket (threaded or press fit). May also work with some other... I'm not sure. I think there are some combatibility charts out there online... and also adapters, etc.

(A simple google search yields this result from AI: "Bottom brackets compatible with the Shimano Hollowtech II standard are other cranksets with a 24mm diameter, hollow axle, such as Race Face X-type, FSA MegaEXO, SRAM Giga X Pipe (GXP), and Campagnolo Ultra Torque, while Praxis T47 bottom brackets can also be used with Hollowtech II cranksets if the frame uses the T47 standard. To confirm compatibility for your bike, you need to identify your frame's bottom bracket shell standard by removing the crankset and measuring the shell's diameter and width, Wheels Manufacturing advises.")

Again, I removed the crankset mainly to switch from a 53t in the front to a 50t... not because the chainrings were blown out... but they are, of course, used... so they have some typical wear on them.

Dura Ace cranksets are generally some of the lightest available and certainly some of the best. At only around 670 grams, the 7800 series is only about 30 grams (1 oz) heavier than the newest / current Dura Ace crankset and is a favorite of weight weenies wanting to shave every ounce from their climbing bikes. 7800 series Dura Ace is 10 speed... but this crankset is generally backward and forward compatible with 7700 (9 spd), 7900 (10 spd), and even 9000 / 9100 (11 spd) series components (as well as Ultegra, 105, Tiagra, etc. Shimano road components are generally mix and match... with only a few instances where they don't play nice with each other. (A 10 spd chain won't work well in an 11 spd deraillleur for example (because it is thicker / wider)... but an 11 spd chain will work in a 10 spd derailleur--and on a 10 spd chainring.

And you can generally mix and match cranksets with other brands' groupsets as well. So it's not unusual to see a Shimano crankset on a bike with SRAM or Campy components. (SRAM, specifically, started out as a cheaper knock off of Shimano components... so their gear was originally 100% compatibile with Shimano... but has veered away from that pure compatibility over time.) But all the chainring does is guide the chain in a circle... so it doesn't really have any unique properties that make it proprietary.

Cosmetically this crankset is about as perfect as used crankset can be... with very little wear on the crank arms (as shown in the pics). This was the last version of Dura Ace (or any other Shimano group) that was polished in the classic road bike style... instead of painted... which virtually all bike components are now... because it's a lot cheaper to paint than polish. (For example, the polished version of Lynsky's Helix titanium framset adds nearly $1500 to the price... because Lynsky claims that polishing the frame takes longer--and costs them as much--as manufacturing the frame does.)

I also have a super clean set of matching ($200) Dura Ace 7800 SPD-SL pedals available... for $100 more.

Let me know if you have any questions that are not easily answered by google.

SPECS:

Brand: Shimano

Model: Dura-Ace FC-7800

Color: Silver

Weight (grams): 670

Number of Chainrings: Double

Rings: Included

Tooth Count: 53/39T

Crank Length (mm): 172.5

BB Included: No

Spindle Interface Type: Hollowtech II

Drivetrain Speeds: 10

Chainring BCD: 130mm, 5-bolt

Pedal Spindle: 9/16"

Crank Intended Use: Road

I'm in the 9th and 9th area of SLC.