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A mate of mine rode Aston Hill recently on his Stumpy 29er FSR (130mm F&R) and reckoned it was as quick as his 26" 160mm enduro, BUT, he said he lacked confidence getting it off the ground in any major way and felt nervous on some of the drops and nowhere near as much 'fun'. With that in mind I am sure that if getting down quickly is your thing, then a burly 29er is fine, but if you'd rather mess about and have a little more security if you get it slightly wrong, then a 650B 160mm machine would be ideal.
I rode BPW on my Bronson and it was the perfect bike for there, but it's also as easy to take on 50km rides than his Stumpy 29er.
Can you copy and paste that reply to the other thread? Trying to get rid of this one ta!
29ers roll too fast so are no good in bike parks, or are they better I can't remember?