The last two times I've had new valve stems installed on Mangusta rims the shops commented about the unusual shape and/or size at the stem base. The first shop (sadly now gone!) found some 'unusual' rubber units that would work and I failed to ask for details. The new shop - a Porsche dealer service dept - can't find any solution apparently.
Anybody familiar with this issue, or using rubber stems currently?! (Shop #1's solution shown below) Appreciate your thoughts, Nate
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Sorry, one additional point on this! At shop 'A', I delivered a set of new Pantera aluminum stems from Wilkinson, assuming they would fit fine. When the tire mounting was done, they handed them back, saying they didn't fit the rims. That's how they ended up fitting the rubber stems shown instead.
I'll try to locate one of these alloy Pantera stems downstairs, and look for one of the old steel(?) stems too that were on #1010 years ago. Comparative photo coming IF that plan works out.....
Nate, at least the original pieces were the Pirelli tubes---lord knows my tires are a long way from needing to be replaced, but if you need a distraction and make things more complicated, now is a good time to buy the tap needed to elongate the threads on the stem so you can fit the Miura-style (sounds sexier than 'valve stem protectors) here; https://pantera.infopop.cc/top...640#8077851272011640
I bought a conical form and aluminum blanks to try and form my own, everything one Covid away...This is probably the least important thing in the world to care about 
Lee
Thanks Lee! It seems logical that Mangusta wheels were designed for tubes, not push-in valve stems...that could explain all the comments from my tire shops.
I can't find any images showing the inner side of a Goose rim (and all my wheels have tires mounted currently...) but something about the area around the hole must be the unusual part of the design, or maybe it's the thickness of the hole 'wall'. The hole itself looks to be 0.625" dia - one of the 2 standard industry sizes - so that can't be the major issue.
Illustrated here are the 'clamp' type stems that worked on 1010 for many years.....as far as I know, nothing unusual about them whatsoever. If the Mangusta rim thickness is unusually large, any clamp-type stem should accommodate that. Maybe finding appropriate 'push-in' rubber stems is the real challenge?
(The stem on the right fits Pantera rims....fwiw it's for the smaller standard size (0.453" dia) stem holes). Anybody have a bare Mangusta rim they could photo to show the 'inner' hole area to shed some light there?! Thanks, Nate
True about the tubes. Last time I had tires mounted I was worried about losing air on recently painted wheels on the trip to Monterrey and decided at the last minute to add
Michelin tubes. No change in drivability. No aur leakage. No balancing problems. I will mount new tires again in about a year and will continue with the tubes.
Hi Denis & Dick, thanks for the input & photos. Clearly the Mangusta wheel wasn't designed for push-in stems. I can see the issues now.
Obviously there ARE rubber stems that can be made to work but I'm opting for tubes next time!! Here is a Pantera wheel for comparison. Regards, Nate
I did run valve sTems only very successfully for about 10 years. I used a racing valve with a nut on the outside that you tightened down, A RUBBER SEAL ON EACH SIDE OF THE RIM. I used silicon sealer to seal them, both sides
. After I had the wheels stripped and painted I sprayed on a mag wheel sealer to prevent leakage. Tubes are so much easier.
DICK RUZZIN
