You know about the SPD-SL plus 4 option?

I use Keywins in the narrowest axle length (-6), in fact all of my family (those who race bikes) do.
The carbon model have moved to using bushings instead of bearings which is giving me mild angst about whether there has been an increase in friction for the sake of 3mm lower stack.
Keywin make it very easy to dial in fit as apart from the range of axle lengths they also have cheap cleat wedges and shims, there is good adjustment on the cleats too so they're a great option from a fitters perspective.

Everything on them is replaceable, with the caution that I usually replace the bodies on my main pedals every year so there is an ongoing maintenance cost with them.

Full disclosure - I'm in New Zealand and Keywins are still made here and I used to ride with the founder when I started doing bunch riding. I'm quite a fan of the brand.

I think the Shimano longer axle option is only available at the dura-ace level pedal....

It's come down to Ultegra now.
When they bought the force pedals design for their fit bike they started to realise that one axle length doesn't cut it

would this work for you?

http://www.niagaracycle.com/categories/sunlite-pedal-extenders-9-16-pedal-9-16-crank-27-5mm

How much longer axles do you need?

+ 10 - 12 mm

I have two pair of Keywin pedals on my road and tri bikes. I do still use Look Keo, but that is only because that bike is a Look 596 with Zed cranks. Otherwise I would use Keywin exclusively.

I really like the very secure cleat/pedal interface, with float provided between the pedal and axle. The system is rather light (I think) and is low profile. Keywin's have the axle length options, which is very nice option. Overall, great pedal system that really does not have a strong presence in USA.

http://weightweenies.starbike.com/forum/viewtopic.php?f=3&t=90491&hilit=keywin+crm


There's a lot of good info on Keywins in this thread on WWeenies.