Some of our Spinning bikes at the gym have these "red pedals". I was trying to goole a pic/link for you. But, no luck so far.

Anyrate... these you can clip in one side spd, and one side is Look. I think ours fit the older style Look pedals that are called "deltas". Seems like someone told me that Look Keos cleats will work in them too.

The other bikes are a mix. Some just have toe strap cages. Some have one side toe straps, one side spd.

Don't know what type of road pedal system you use outside... but if it's Look, you might already own shoes that work to clip in.

Word to the wise though as it gets cold. Classes at our gym fill up and overflow. The regular non-outside peeps come back more PLUS the roadies pile in.

The roadies in particular fight over these red pedals. So, if you only bring shoes to clip into a certain type of bike, and there are no bikes left with that pedal, then you are sol unless someone switches bikes with you.

Road shoes would be hard to make do into a toe cage. But a mtb shoe might work.

Lately I have been wearing my Keen commuter sandles w/spd multirelease cleats. Love em.

I rode my first class in toe straps--no more. I paid for shoes because I knew I loved it. I was not even an outside rider then. The straps are made to fit I think a man's sized 11 shoe. I'm a ladies 8 roughly. The fit just suxed for me.

Hope you enjoy your classes. I think there are many drills that are a nice compliment to outside riding. But then again, I'm a bit partial... because I'm also a certified Spinning instructor now too.