Weight Weenies

Hi,

Just wondering if someone can provide any input on the differences between the Dura Ace R9100 pedals vs the Ultegra R8000 pedals.

Apart from the lower weight are there any internal differences such as bearings? Would going Dura Ace R9100 be a better purchase decision over the Ultegra R8000's or are the Ultegra's better value?

Thank you!

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I can’t compare those in real life but i can compare the new 9100 vs the old 9000 dura ace pedals.
Don’t know if it’s only me but i find the new 9100 pedals less good. Every 2 weeks i need to regrease them or they are making a ticking noise.
If you compare the ultegra vs the dura ace on the internet then there is not much differences apart from the weight. Would go for the ultegra pedals there they are half the price of the dura ace pedals.

Stack height is lower on 9100.

wheelbuilder wrote: ↑

Sun Aug 05, 2018 7:58 pm

Stack height is lower on 9100.

And I think the ‘Q’ factor is a mm or two less on the DA pedals.

ok, thank you for all your responses. Sounds like the Ultegra's are still better value

I value lower stack on the DuraAce more than the low cost of the Ultegra. Also I feel less like a duck with a lower Q factor. Therefore my money goes to Dura.Ace

The 9100 have a lower q factor (pedal stance/width) and a lower stack height (a lower stack height is better for power transfer).
The 9100 pedals (at least compared to 6800 pedals) have a third bearing on them. This adds more stability and can last longer before play develops.

http://si.shimano.com/pdfs/ev/EV-PD-R9100-4056.pdf
http://si.shimano.com/pdfs/ev/EV-PD-R8000-4232.pdf

JScycle wrote: ↑

Mon Aug 06, 2018 8:16 am

(a lower stack height is better for power transfer).

Evidence?

AyBee wrote: ↑

Tue Aug 07, 2018 4:33 pm

JScycle wrote: ↑

Mon Aug 06, 2018 8:16 am

(a lower stack height is better for power transfer).

Evidence?

Seriously?

wheelbuilder wrote: ↑

Tue Aug 07, 2018 5:25 pm

AyBee wrote: ↑

Tue Aug 07, 2018 4:33 pm

JScycle wrote: ↑

Mon Aug 06, 2018 8:16 am

(a lower stack height is better for power transfer).

Evidence?

Seriously?

Actually, i'd like to see too.
Just some scientific proof that it is more efficient in which condition.
So that we have more concrete knowledge, just like when they study that flat pedal is not at disadvantage to clip-in pedals at cruising speed (without surge or sprint), it is just as efficient when not going hard, which when the study shows, i then no longer reluctant to just use flat pedals on my commuter bike.
If Lower stack height is only better in a certain condition or on some people, it would be nice to know too.

what does lower stack height mean?

eforce123 wrote: ↑

Tue Aug 07, 2018 6:56 pm

what does lower stack height mean?

Pedal stack height is the distance from the bottom of your foot to the centerline of the pedal axle. It’s assumed that less is better but in my thirty years of riding, I have never read a scientific explanation of why.

Lots of factors influence it. Cleat thickness and shoe sole thickness being the primary ones.

BdaGhisallo wrote: ↑

Tue Aug 07, 2018 7:32 pm

eforce123 wrote: ↑

Tue Aug 07, 2018 6:56 pm

what does lower stack height mean?

Pedal stack height is the distance from the bottom of your foot to the centerline of the pedal axle. It’s assumed that less is better but in my thirty years of riding, I have never read a scientific explanation of why.

Lots of factors influence it. Cleat thickness and shoe sole thickness being the primary ones.

so the closer your foot is to the center line of the pedal is the argument on stack height right being more efficient? seeing there is no scientific evidence, just making sure I understand.

eforce123 wrote: ↑

Tue Aug 07, 2018 7:40 pm

BdaGhisallo wrote: ↑

Tue Aug 07, 2018 7:32 pm

eforce123 wrote: ↑

Tue Aug 07, 2018 6:56 pm

what does lower stack height mean?

Pedal stack height is the distance from the bottom of your foot to the centerline of the pedal axle. It’s assumed that less is better but in my thirty years of riding, I have never read a scientific explanation of why.

Lots of factors influence it. Cleat thickness and shoe sole thickness being the primary ones.

so the closer your foot is to the center line of the pedal is the argument on stack height right being more efficient? seeing there is no scientific evidence, just making sure I understand.

Yes - low stack height is better.

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