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The difference is that the mk3 tdi came with 14" the mk4 tdi came with min 15". 14" won't fit on the mk4 due to brake clearance.

Also, the final drive on the mk4 is a little shorter, the VNT makes power earlier, and the mk4 has more power potential than the mk3 due to turbo, injection pump, etc. Each on it's own is minor but it adds up.

The mk4 also had the pumpe duse on later years, so those have more power potential. Yes the non pumpe mk4 have had more built cars, but the suggested sizes are appropriate for 99% of tdi drivers.
 

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Don't forget clearance issues. If it was a stock wheel it should fit but aftermarket wheels may not. Using tires that are too large on a wheel that is too large will cause problems since larger stock wheels normally use thinner tires. IIRC, some factory 18" wheels used some kind of spacer kit on the rear wheel too.
 

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Discussion Starter #4
Are stock take-off wheels any better in how strong they are or are they better just because they fit? What is your opinion on hubcentric rings?
 

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Well, hubcentric rings are neded to center the wheel before putting the lugs on. From what I've heard, even though in theory they aren't needed, in reality not using the spacer can cause vibrations.
 
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