Hi - I have the bike listed above with the following specs:
Component Group Shimano Altus C90
Brakeset Shimano Altus brakes, alloy levers
Shift Levers Grip Shift MRX-100
Front Derailleur Shimano Altus top-swing, top-pull/clamp-on 28.6 mm
Rear Derailleur Shimano AceraX
Crankset Shimano Altus, 24/32/38 teeth
Bottom Bracket Shimano BB-CT91, 120 mm spindle
BB Shell Width 73mm English
Rear Cogs 7-speed, 11 - 28 teeth
Chain KMC UG-50, 1/2 x 3/32"
Seatpost Alloy micro-adjust, 26.6 mm diameter
Saddle Fisher Supersoft
Handlebar Extensions Not included
Handlebar Stem Steel
Headset 1 1/8" steel
I've never removed a crankset with one of those clamped-on front derailleur tabs before.
Is it possible to remove the cranks, remove the clamp, and then still use the 120mm bottom bracket for a different crankset? I'd like to actually install a double crank on this bike because the stock gearing is WAY too low for road use. I realize I may have to play with the chainline a bit....no biggie.