It depends on what you consider to be a "problem". Over the years I have read postings from idiots putting 29's on their stock 450-500 rides and claiming there was no loss of power.
By comparison to your stock setup, you will have a VERY significant loss of low end power with 30's...but if you don't go into mud deeper than an inch or two, or if you never climb hills with a 5% or steeper grade, or if you never try to crawl over rocks/logs on a trail, then it won't be a problem.
Take a look at AC's specialized 700 Mudpro, which has a special axle ratio installed by the factory in order to be able to effectively turn it's factory-issued 28 inch tires...such a great idea (and it's about bloody time!)
I wonder if anyone has considered swapping Mudpro gears/axles into their standard machines...or if it can even be done
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