Building up a beater bike and from a frame I picked up and curious if anyone knows top of mind what diameter the seat post needs to be for a Specialized Allez road bike. Thanks!
It may depend on the year. You will probably find the info on www.specialized.com. fwiw, I’ve only seen them with 27.2, but my experience may not broad enough.
I had a classical steel Allez that was built in 1982 and it had a 26.8mm seatpost.
specialized uses 27.2 mm round seatposts for all of their road bikes (allez,tarmac,secteur, roubaix).