How much too wide is the hub?
Most road cassette hubs are 130 mm so it might be tight but not too bad, and easy to spread the frame to get the hub in. The "cassette mount" is probably a freehub, and if you thinking of converting the wheel to ss you will need it. The relevant dimension is the lock nut, hence the dimension is 130 mm OLN (over lock nut)
Tell us what that dimension is so we can advise some more.
How much too wide is the hub?
Most road cassette hubs are 130 mm so it might be tight but not too bad, and easy to spread the frame to get the hub in. The "cassette mount" is probably a freehub, and if you thinking of converting the wheel to ss you will need it. The relevant dimension is the lock nut, hence the dimension is 130 mm OLN (over lock nut)
Tell us what that dimension is so we can advise some more.