1983 Trek 600 Modern Build; 1986 Specialized Allez SE 'Jim Merz'
I am part way into a bike build using a (early '90s?) Bianchi frame, and the cheapo Ritchey Logic expert 1 1/8 threadless headset I just got off nashbar doesn't fit, the cups being too big for the head tube. The 1 1/8 fork i got fits into the head tube just fine, the head tube diameter is 35mm outer, and 30mm inner. The cups are 33 or 34mm, I am wondering if this is standard for 1 1/8 headsets, as i can't really seem to find these measurements on specs.