Mavic 721 Rims

PB Forum :: Downhill
Mavic 721 Rims
  • Previous Page
Author Message
flag creech
Posted: Mar 13, 2009 at 12:50 Quote
I have a set of Mavic 721`s laced with I9`s...now my problem is that the front rim keeps on ripping off the valve stem...theres no jaged edges and it fits in fine...theres no spokes pretruding the rim tape and im careful of making sure the valve isnt cockeyed when I pump it full of air...is there any reason why it keeps shredding my valve stems cuz ive gone through so many tubes in the past 3 days lol Big Grin

Thanks for the help

Chris
flag thehustler
O+
Posted: Mar 13, 2009 at 13:09 Quote
this happened to my mtx rims last year but just disappeared one day. maybe try rounding out the edges..
flag biscuito
Posted: Mar 13, 2009 at 13:12 Quote
sounds a bit strange, the edges might jus need a light file to round them a bit.
flag MR-STP2
Posted: Mar 13, 2009 at 13:24 Quote
better tubes????
flag creech
Posted: Mar 13, 2009 at 14:00 Quote
well ive already filed and sanded the edges...and ive tried different tubes im wondering if its cuz the tubes or tire is slipping even when its full of air...
flag nwatkins
Posted: Mar 13, 2009 at 14:18 Quote
How much psi are you running?
flag rowlands
FL
Posted: Mar 13, 2009 at 14:19 Quote
its your tire its either not seated properly or the bead is streched
flag creech
Posted: Mar 13, 2009 at 14:25 Quote
SavageMountainAnimal wrote:
How much psi are you running?

ussualy around 35-45 psi
flag rosslikesbikes
Posted: Mar 13, 2009 at 14:41 Quote
Sorry bit random, but you guys seem to know about 721's so you'd be best to answer this, I am looking at wheels to get for a DH bike i am building. Do think 721's would be better than deetraks?
flag creech
Posted: Mar 13, 2009 at 14:44 Quote
rosslikesbikes wrote:
Sorry bit random, but you guys seem to know about 721's so you'd be best to answer this, I am looking at wheels to get for a DH bike i am building. Do think 721's would be better than deetraks?
Definitly...my opinion tho...
flag w-e-w
Posted: Mar 13, 2009 at 17:39 Quote
rowlands wrote:
its your tire its either not seated properly or the bead is streched

yeah.. if the rim tape is good and the hole is smooth.. then the tire must be moving (spinning) on the rim a bit when breaking and causing the problem..
flag mitcht
Posted: Mar 13, 2009 at 18:12 Quote
Once the tire is inflated, remove the small threaded nut that holds the tube down against the rim. This will allow the tube to move, rather than get pinched.
flag veet-88
O+
Posted: Mar 14, 2009 at 14:40 Quote
rosslikesbikes wrote:
Sorry bit random, but you guys seem to know about 721's so you'd be best to answer this, I am looking at wheels to get for a DH bike i am building. Do think 721's would be better than deetraks?

I lold last I checked dee tracks use a 721 hoop? just like the dee max use a 823 hoop?

Ryan
flag thehustler
O+
Posted: Mar 14, 2009 at 14:50 Quote
i think its actually ex729 on deetracks not ex721. It has always been like that i think. not ex 721 this year either.
flag i-ride-bike
Posted: Mar 14, 2009 at 15:07 Quote
yeah.. im gonna say just either remove or loosen the little nut thing that screws down onto the rim.. my mate had the sam problem (not same rims though) and it worked. Give it a go..
  • Previous Page

 


Copyright © 2000 - 2024. Pinkbike.com. All rights reserved.
dv42 0.012496
Mobile Version of Website