Changing crankset

My other half lovingly washed my commuter 2008 Specialized Sirrus a few months ago, but put it back in the shed when done. Unfortunately the front crankset is now covered in rust and shifting is becoming difficult (to be honest it needed changing anyway). I've booked it in to my lbs to have a full service, which includes new cables etc.
I want to change the original Sugino XD crankset for an old (but unused) Shimano FC2303 which I have. The only potential issue is that the old chainrings are 48-38-28 and the FC2303 has 52-42-30. I have a Sora long cage 8spd derailleur at the back. Can anyone forsee any issues with a straight swap? Both cranksets are square taper 113mm so there shouldn't be any problems with that.
Thanks in advance.
Ruth
I want to change the original Sugino XD crankset for an old (but unused) Shimano FC2303 which I have. The only potential issue is that the old chainrings are 48-38-28 and the FC2303 has 52-42-30. I have a Sora long cage 8spd derailleur at the back. Can anyone forsee any issues with a straight swap? Both cranksets are square taper 113mm so there shouldn't be any problems with that.
Thanks in advance.
Ruth
Cannondale Synapse AL 105, Specialized Sirrus Comp
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You might get the rust off if you try - take a look online for how to.
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