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you must keep the same wheel diameter +/- 3%
If you do not respect it is not legal regarding to the European tyre and rim technical organisation (ETRTO)
Moreover "gearbox ratio" will be modified
The calculation is the following
original size is 225/50/17
wheel diameter: 225mm*0.5*2 + 17" (1" = 25.4mm)
=657 mm
then 295/25 R20 is -0.2% ==> OK
285/30 R20 is 3.4% ==> not OK
245/35 R20 is 3.5% ==> not OK
nevertheless the non conformity is marginal ....
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