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Pedal stack height

Old 11-05-18, 06:25 PM
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JohnUSA
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Pedal stack height

I have my road bikes seat height set to a good height, and I just bought a gravel bike so Id like to be able to transfer my seat height to the new bike. I have the same seat setback on both bikes, and both bikes have the exact same saddle.

My road bike has SPD-SL three bolt road cleats, and I have Pearl Izumi carbon fiber shoes. My gravel bike has SPD two bolt mountain bike pedals with Shimano XC7 mountain bike shoes.

Whats the difference in stack height between those two pedals? Basically, how much higher or lower should I set my gravel bike seat to equal the same height as my road bike seat?

Thanks,

John
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Old 11-05-18, 08:57 PM
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Measure it after you get a good saddle position,

which may well be lower because of wanting more leg suspension & butt clearance on uneven terrain.

Technically, you could measure the shoe/pedal assemblies with calipers...
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Old 11-05-18, 09:17 PM
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I'd go with the traditional way of starting with saddle height to where you're at full leg extension when your heel is on the pedal and not raise it by no more than a millimeter at a time if you want to play around the edges.
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Old 11-05-18, 09:54 PM
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Originally Posted by JohnUSA View Post

My road bike has SPD-SL three bolt road cleats, and I have Pearl Izumi carbon fiber shoes. My gravel bike has SPD two bolt mountain bike pedals with Shimano XC7 mountain bike shoes.

What’s the difference in stack height between those two pedals? Basically, how much higher or lower should I set my gravel bike seat to equal the same height as my road bike seat?

Thanks,

John
If you have both pedals, can't you just measure and do the math?
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Old 11-05-18, 10:58 PM
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Based on my crude measuring, they're about the same- ~3/4"

Road cleats are thicker, but the pedal surface is closer to the spindle,

Carbon sole a little thinner than typical nylon sole mtn shoes.

Don't forget to adjust for the thickness of socks being worn!
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Old 11-06-18, 12:04 PM
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Originally Posted by JohnUSA View Post
I have my road bikes seat height set to a good height, and I just bought a gravel bike so Id like to be able to transfer my seat height to the new bike. I have the same seat setback on both bikes, and both bikes have the exact same saddle.

My road bike has SPD-SL three bolt road cleats, and I have Pearl Izumi carbon fiber shoes. My gravel bike has SPD two bolt mountain bike pedals with Shimano XC7 mountain bike shoes.

Whats the difference in stack height between those two pedals? Basically, how much higher or lower should I set my gravel bike seat to equal the same height as my road bike seat?

Thanks,

John
Take pictures of both pedals on the ground with a vertically placed ruler next to each. post those pictures here. then we will count the marks on the ruler and tell you the difference.
...or just measure center of BB to top of saddle on your road bike, apply that distance to your gravel bike, and ride. If its a bit off, adjust accordingly.

Are the crank arms on both bikes the same length?
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Old 11-06-18, 12:47 PM
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Originally Posted by JohnUSA View Post
I have my road bikes seat height set to a good height, and I just bought a gravel bike so Id like to be able to transfer my seat height to the new bike. I have the same seat setback on both bikes, and both bikes have the exact same saddle.

My road bike has SPD-SL three bolt road cleats, and I have Pearl Izumi carbon fiber shoes. My gravel bike has SPD two bolt mountain bike pedals with Shimano XC7 mountain bike shoes.

Whats the difference in stack height between those two pedals? Basically, how much higher or lower should I set my gravel bike seat to equal the same height as my road bike seat?

Thanks,

John
Based on my seat-of-the-pants measurements, my road shoes are slightly thicker, with the 3-bolt cleat, than the recessed 2-bolt on my 'MTB' shoes. Pedal thickness is within +/- 1.5 mm between my single- and double-sided 2-bolt pedals and my plastic- and metal-bodied 'LOOK' pedals. When I 'retired' my old road bike to townie/path use, I definitely had to lower the saddle after I swapped the LOOKs for SPDs to make it comfortable.

I'd go with setting the BB-to-saddle top the same, then actually get on the bike, and see how it rides. Things like the TT length, stem, and stack height will probably affect how you choose your final setup.

It's not a big deal to make a saddle-height adjustment on a bike with a conventional seat post. Bring your 5mm allen key with you.
This is a gravel bike, right, so it's not one of those cut-to-fit seat masts like a TT bike. Don't need to think so hard.
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Old 11-06-18, 02:10 PM
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Old way..

Yard/Meter stick 0 on the pedal top end, read the number at the top
of the measuring stick..

I do the same thing for my bikes with various crank arm lengths,
longer the crank the lower the saddle to ground distance, But,

The saddle to pedal distance is same.. be it 170, 175, 180, etc cranks..



....
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Old 11-08-18, 12:56 PM
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Originally Posted by fietsbob View Post
Yard/Meter stick 0 on the pedal top end, read the number at the top
of the measuring stick..

I do the same thing for my bikes with various crank arm lengths,
longer the crank the lower the saddle to ground distance, But,

The saddle to pedal distance is same.. be it 170, 175, 180, etc cranks..



....


OP is asking about thickness of shoes/pedals i.e. distance from pedal centerline to bottom of the foot.
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