SIDI shoe question

[thunderworks]

I'm talking to a fellow forumite about buying a pair of SIDI shoes from him off the classified ads. His shoes have a 4-bolt pattern (Speedplay perhaps?). I use a 3-bolt Shimano cleat/pedal design. Can I use the 4-bolt shoes and simply not use the 4th, bottom bolt? Or are there issues not readily apparent?

TIA

[oldpotatoe]

I'm talking to a fellow forumite about buying a pair of SIDI shoes from him off the classified ads. His shoes have a 4-bolt pattern (Speedplay perhaps?). I use a 3-bolt Shimano cleat/pedal design. Can I use the 4-bolt shoes and simply not use the 4th, bottom bolt? Or are there issues not readily apparent?

TIA

4 bolt aka older Time pedals or SP w/o the first 3 bolt mount plate? If so, you need an adapter, 4 bolt to 3 bolt or if the shoes are old enough, the 4 bolt plate sits in a recess of the shoe, is removable and replaceable with a 3 bolt adapter. Pretty old design tho, 10 years plus old, finding adapters may be a challenge. Cannot just use 3 holes if that's what they are. 4 bolt holes forming a little square.

Pics show it's a standard 3 hole plate with a 4th hole toward the heel to secure the plate. With the 2 slots in the middle for MTB type cleats.

[RedRider]

The Sidi sole you are referring to was designed specifically for Speedplay cleats . The 4 hole pattern allowed the cleat to be mounted directly onto the sole, reducing the stack height. On standard 3 hole sole an adapter is needed for Speedplays. I'm not aware of any adapter for 3 holes and it would defeat the purpose.

[kramnnim]

If they are 45's, we can trade!

(I didn't see the shoes listed)

[OtayBW]

The Sidi sole you are referring to was designed specifically for Speedplay cleats . The 4 hole pattern allowed the cleat to be mounted directly onto the sole, reducing the stack height. On standard 3 hole sole an adapter is needed for Speedplays. I'm not aware of any adapter for 3 holes and it would defeat the purpose.
Thanks for the info. Very helpful.

[pdmtong]

I'm talking to a fellow forumite about buying a pair of SIDI shoes from him off the classified ads. His shoes have a 4-bolt pattern (Speedplay perhaps?). I use a 3-bolt Shimano cleat/pedal design. Can I use the 4-bolt shoes and simply not use the 4th, bottom bolt? Or are there issues not readily apparent?

TIA

Adapters for three bolt to four but not four bolt to three

Speedplay shoes are only for speedplay pedals.