I have 721s 36h on hope2s not sure of the weight but i ride these everywhere from 30 40 mile xc rides to serious dh/fr shuttle runs
GO with the 721s not sure why you would want a 1.5 slick on it but it wouldnt be bad these rims are not super wide
Oh i got mine from CRC for around $340 shipped with paypal fees you cant beat their prices and the build quailty is top notch
I weigh 235 out of the shower and have beat the crap outta mine for over a year and they are holding up great
Go here http://www.chainreactioncycles.com/Kits.aspx?ModelID=7599
select the parts you want built
I have spent 1-2 seasons on either rim. They are interchangeable. The 721 is stronger, made of a stiffer alloy, and as mentioned has a nicer rim joint. The 321 builds up well and seems to take about the same amount of abuse. If you are looking to thrash on the wheels, then I would go 721 over the 321. Otherwise the 321 will hold up fine, be cheaper, and be lighter :thumbsup:
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