You know ... the one that's been sitting in your garage for YEARS that you really don't use anymore.
I'm going to hook them up to bikes I exhibit at fairs and such so folks can get a sense of what its like to pedal a recumbent without putting them at risk.
So ... doesn't matter how scroungy they look - as long as the work OK and accept wheel sizes up to 700c
Annnnd ... are cheap.

Don't think rollers would work for this purpose. Just the standard everyday friction/fluid trainers you see all over.

Please contact me ASAP - got lots of shows to do this season.

Thanks in advance .... John G.