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Cheers for all that hippy - did a bit of digging on the train in and found a lot of info on model specific stack heights of shimano pedals. Will pop it in here later in case it’s useful for anybody else
jupiz-
Nice one. I ride too many bikes now and swap between flats and Speedplay midfoot so my personal setup is all over the shop. It'd be different if I was riding 25hrs a week on the TT bike again.
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My dura ace pedals (r9100) are 1mm less stack than the 6800/8000 and 105 I have. In terms of feel the only difference is clipping in and out, I don’t notice the very slight difference in stack height. Using the shimano blu cleats if that makes a difference….
hippy
808cowbell
You're right. I did have another link but didn't post. It's a few mm according to this.
https://forum.bikeradar.com/discussion/12891402/saddle-height-between-spd-and-spd-sl-pedals
I'm sure I've looked into this before, maybe even posted differences on here.
Speedplay:
https://www.lfgss.com/comments/14332578/
Time ATAC:
https://www.lfgss.com/comments/6781015/
SPDs:
https://www.lfgss.com/comments/8159952/
https://outerask.com/spd-vs-spd-sl-stack-height/
"Shimano’s XTR pedal stack up in terms of stack height? Well, it’s one of the lowest Profile pedals on the market with a mere 10mm of stack height. "
"Shimano Spd M520 Stack Height The Shimano SPD-M520 is a mountain bike pedal that was introduced in 1992. It features a stack height of 14mm"
"The M540 has a stack height of 12.7mm"
"The average stack height for SPD pedals is 14.5mm, while the average stack height for SPD-SL pedals is 9.5mm."
https://forums.thepaceline.net/showthread.php?p=3025620
One source reports that the XT XC pedals have a stack height of 18mm.
https://mtbgearbox.com/shimano-xt-vs-xtr-pedals/
That’s versus 13.7mm for Ultegra. XTR and DA are lower.
Then you’d need to consider the stack height of the shoe, e.g. the sole thickness.
Road pedal stack heights:
https://weightweenies.starbike.com/forum/viewtopic.php?t=164853
R8000: "Shimano has decreased the pedal’s stack height by 0.7mm"
https://www.cyclingweekly.com/reviews/pedals/shimano-ultegra-pedals
https://www.bikeforums.net/18470444-post1.html
"On the web I found a source that said 13.7mm for the Ultegra pedals (did not mention though if it's the 6800 or an earlier model) and 14.3mm for a Ritchey one-sided SPD road pedal which is the closest thing I could find to the PD-A600. Double sided Shimano SPD pedals are listed as 17mm. Then I guess the shoes play a role as well."