GT PP wheel help! Spacers?

[ZIGZGT]

I've never put a different set of wheels on my previous rides. I really like the stock PP wheels, but I am considering switching after a bit. I really like the STR 607's in black. I'm looking to get a 10 or 10.5 20" wheel. Hoping to get a 305 on the back. I'm not positive, but according to one site they may not clear the Brembos! Help! I really like these wheels. Would spacers help? Are there any other options? Sorry, I just don't know much about wheel swapping. Thanks fellas. I'm always finding great info on here! :cheers:

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