Originally Posted by
lkayser
i’m spinning out often on my current bike but don’t want to modify that bike.
Getting a bigger chainring and/or a smaller cog would give you a bigger gear. This is a completely reversible procedure, so it's not really a "modification." Just sayin'.
Originally Posted by
lkayser
Preferably a carbon frame or a lighter alloy frame with a carbon fork , 700c aero wheels.
Because of the chain tensioning issue, I think a dedicated singlespeed frame with horizontal track ends makes things a lot easier than converting a geared bike with vertical dropouts, although there are a few ways you can do that.
I'm all about steel, so my recommendations wouldn't fit your criteria. Best of luck on your quest!