Shimano Ultegra (FC-6503)
175mm Road Cranks
Shortened to 153mm

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$179
w/30, 42 & 52t Chainrings
Price includes: Shortened arms,
chainrings, chainring bolts
& crankarm fixing bolts.

S&H $11 in the USA
MN residents add 6.5% sales tax
(More if you are in the Metro area)
12/4/09 - I just found 5 more of these.
As they get rarer, I have to pay more each time I find some. But so far I've been able hold the price, shortened,
to less than they sold for new, unshortened.

Contact me to check availability before sending money.

These are the highest quality cranks that can be shortened. Light yet stiff, they are HollowTech, ie. the arms are hollow. However, when shorted the new pedal eye misses the hollow section by a good margin.

The bad news is that these fine cranks are no longer in production.

With the standard chainrings, these are particularly suited for faster riders, (or normal folks with 20" rear wheels).

For the rest of us, $80 will upgrade you to
Salsa 24 or 26t and
FSA 39/48t Chainrings
Included are Shimano One Key Release type crank fixing bolts.

Functioning as crank bolts, dust covers and crank puller, they allow you to remove your cranks with just an 8mm Allen key.
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About the Shimano Ultegra 9 Speed crankset
Weight;
With Shimano 30, 52 & 52t Chainrings - 669 grams after shortening. With FSA 24, 39 & 48t Chainrings - 641 grams after shortening.

Q factor; 161mm with Shimano 118.5mm spindle.

BB spindle;These will fit any 118.5mm Shimano Octalink type V-1 spindle; 105, Ultegra or Dura Ace. However only the 105 is still available in 118.5 for a triple.
If you need a BB spindle - I urge you to support your local bike shop, by buying it from them. (Especially if you will have them install it. :-)

However, if this is not possible, I can provide one for $55.

Bolt Circle Diameter (BCD) The middle and outer ring are 130mm BCD, inner is 74mm.

 How Safe Are Shortened Cranks?
Knee Savers should not be used with these cranks. They increase leverage and may overstress the reduced amount of metal around the eye.

"Safely" is a relative term. Modern cranks hopefully have a margin of safety to allow for the occasional 280 lb mountain biker. Shortening will obviously reduce this safety margin, as there will be less aluminum around the pedal eye than before. So, I only recommend using shortened cranks on recumbents.

Back in the '70s and early '80s road cranks were often smaller around the pedal eye than is common today. Failures were rare, but not unheard of.
Click HERE for examples.

I will shorten a good quality, cold forged crank if it will have at least as much material around the new pedal eye as those older cranks.

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