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My 3 year old Mavic XM719 rims are looking pretty battered these days, still running fairly true but lots of flat spots and the odd bent lip. Wanting to go tubeless and these are just not inflating with a normal high roller, air is escaping all the way round the bead no matter how much air gets put in. Not sure if i'm missing a trick to help sealing or what. Reason for wanting to go tubeless is mainly to reduce pinch flats at the pressures I want to run.
Debating whether to replace the rims with some stans flow rims so I can also stop swapping between a superstar DH wheelset and the 719's. The hubs are hope pro II with fresh bearings so no great need for a whole new wheelset really.
What would you do? keep the 719's till they eventually die, replace rims, whole new hope hoop wheelset?
You are using sealant?
I don't replace until there is something functionally wrong.
Sell 'em on ebay and buy a new set of hope hoops.
cynic-al - I don't want to waste sealant until I know they will at least hold some air.
Was tempted by the ebay idea. Sell both those and my superstar wheels and get one fresh pair of hope/flow rims.
I don't get it...they'll never hold air without sealant, the cost of trying is **** all?
Your issue is the tyres-all trhe single ply maxxis I have ghetto tubeless mounted have been failing at the rim/bead area. They plain and simply are not made for heavy low pressure tubeless use in my experience (two Minnion single ply folding rears in less that six months.
The other issue will be before you mount the maxxis go round the bead area and snip off all the release nipples that run round the circumference of the bead, this will help them seal up better/quicker.
I am still running an old set of Hope Hoops (5.1)but just switched to some Conti Rubber Queen 2.2's in proper tubeless black chilli compound.Mounted them with SlimePro sealant to ward off any rim rot caused by Stans and also so that I can still re inflate should I need to with CO2 (as CO2 instantly sets latex!).
to ward off any rim rot caused by Stans
Uh, what's that then?
A lot of the latex based sealants consist of ammonia based carrier fluid which rots rims and can cause tyres to delaminate. I personally think that tyre delamination is more to do with the non tubeless tyres being used ghetto tubeless and run at too lower a pressure than they were designed for however my last non UST minnion had delaminated inside and was only run at 35psi lowest pressure and this was close to the bead area that failed.
The rot of rims I have seen first hand on a mates rims and also on t'inteweb. There is big debate with Stans saying oh no it dont- for obvious reasons I would say-would cost them thousands in claims!
My other issue with Stans is its no good if its dried up an a gummy ball if you have put a dose of CO2 in the tyre following a big burp!
Cynic - I've had two maxxis single ply tyres inflate without sealant on a mavic ust rim and a stans 355 rim. And the last time I tried to use sealant to fill up even small air gaps around the bead it made no difference at all.
stans website also recommends: "Do not add sealant until you’ve successfully been able to seat the tire."