Fitment advice from the experts

[wdc330i]

My e91 runs 17-inch staggered wheels: 225/45/17s on rims 7x8 ET34 front and 245/40/17 17x8.5 ET39 rear.

From running the calculators, it looks like the e61 rims will work: 17x7.5. Figuring 205/45/17 winter tires. Or 225/45/17s. Or 50s in either. Looks like 45s lower about .5 inches and 50s raise by a similar amount in the 205s.

Can anyone please confirm?

Many Thanks!

PS: Best I can do below with posting calculator results. Looks like the biggest difference is for the rear.

FRONT:

Wheels: Wheel 1 Wheel 2
Wheel size 17x8 ET 34 17x7.5 ET 43
BackSpace 148 mm (5.8'') 151 mm (5.9'')
3 mm (0.1'') deeper.
Rim Lip 15 mm (0.6'') wider
Typical Weight ~ 24 lbs / 11 kg ~ 22 lbs / 10 kg
Tires: Tire 1 Tire 2
Tire size 225/45-17 205/50-17
Section width 225 mm (8.9'') 205 mm (8.1'')
Sidewall 101 mm (4'') 103 mm (4.1'')
Tire diameter 634 mm (25'') 638 mm (25.1'')
4 mm (0.6%) taller.
Rim sizes 17x6.5 to 17x8.5 17x5.5 to 17x7.5
Circumference 1991 mm (78.4'') 2003 mm (78.9'')
Revs per mile 808.4 803.3
Typical Weight ~ 22 lbs / 10 kg ~ 21 lbs / 10 kg
Wheel+Tire Weight ~ 46 lbs / 21 kg ~ 43 lbs / 20 kg

REAR:

Wheels: Wheel 1 Wheel 2
Wheel size 17x8.5 ET 34 17x7.5 ET 43
BackSpace 154 mm (6.1'') 151 mm (5.9'')
4 mm (0.2'') shorter.
Rim Lip 22 mm (0.9'') wider
Typical Weight ~ 25 lbs / 11 kg ~ 22 lbs / 10 kg
Tires: Tire 1 Tire 2
Tire size 245/40-17 205/50-17
Section width 245 mm (9.6'') 205 mm (8.1'')
Sidewall 98 mm (3.9'') 103 mm (4.1'')
Tire diameter 628 mm (24.7'') 638 mm (25.1'')
10 mm (1.6%) taller.
Rim sizes 17x7 to 17x9 17x5.5 to 17x7.5
Circumference 1972 mm (77.6'') 2003 mm (78.9'')
Revs per mile 816.1 803.3
Typical Weight ~ 23 lbs / 10 kg ~ 21 lbs / 10 kg
Wheel+Tire Weight ~ 48 lbs / 21 kg ~ 43 lbs / 20 kg