Two pairs of shorts or bibs is plenty.

Ditto for the jerseys

One tech tee shirt is enough.

One pair of zip off leg pants is better that two pairs of cargo shorts.

Three pairs of socks is enough.

Skip the sweat shirt and take a thin pile shirt.

Leave any clothing item that is cotton home.

Expect that it might be at or below freezing at some point and take leg warmers and a wind breaker.

Skip the spare chain. Take a chain breaker and a couple quick links.

Skip the spare tire.

Three spare tubes is enough, but add patch kit.

Straps work better than bungee cord IMO.