The Allegro has a chromoly steel fork, is an 8 speed, and has an lower tier componentry. OTOH, the Sirrus has a carbon fork, is a 9 speed, and has higher tier componentry than the Allegro.
There's very little comparison component-wise with these two bikes. However, the main point of contention should be fit. How do each of these bikes feel when you test ride them?...In cycling, everything is about fit and feeling!
Last edited by WestPablo; 05-08-14 at 06:09 AM.