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Dura Ace 7850 weep holes preventing tubeless mounting

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Dura Ace 7850 weep holes preventing tubeless mounting

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Old 01-08-19, 12:39 PM
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masi61
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Update for Tuesday, January 8th 2019:

I don’t think running these without sealant is going to be advisable. The Hutchinson Fusion5 All Season 23mm tire did inflate well with my Airshot last night and it was not hissing detectably when first mounted without sealant. The initial pressure was like 77psi, later last night it was 55psi. This morning is was 25psi and then “zero” when I adjusted the valve locknut to place the little asymmetrical shim on the valve that contours to the offset rim then allows the presta knurled nut to tighten down squarely.

So I did a bit more archival bike forum research - reading some good discussions on road bike review from back in 2010.

I went ahead and used my Stan’s syringe and put 30ml of regular Stan’s sealant under the bead which I pushed away from the rim sidewall. I tried to guide the hose into the interior of the rim. It mostly worked. I rotated the wheel about 180 degrees and back then gave it another 160psi shot from the Airshot. Nice. Everything buttoned up leak free immediately again. This time there was some splatter of Stan’s. I took the wheel/tire to my utility tub and gave it a spray of warm water and the liquid Stan’s washed away nicely. The tire now is holding about 78psi again. It is odd but the wheel does seem heavier slightly as you can feel the sealant rolling around. I will recheck the pressure tonight and again tomorrow just as a learning experience.

Riding these early tubeless wheels is going to be fun. I have been riding pretty heavy 36 spoke front and rear touring clinchers on my road bike for about 10 years. Last year I started to get the bug to get faster wheels - ...
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Old 01-10-19, 07:18 AM
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@masi61 , how is the pressure holding today? Seems like quite a battle to get the reliably sealed to the rim. Have you ridden them yet? If you have, do you think the ride is worth the effort?
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Old 01-10-19, 08:07 AM
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Originally Posted by speedevil View Post
@masi61 , how is the pressure holding today? Seems like quite a battle to get the reliably sealed to the rim. Have you ridden them yet? If you have, do you think the ride is worth the effort?
Thanks for the interest!

The rear is holding air well now.

The correct Shimano (front) valve will be delivered any day now. Iím more confident that the front will hold air as it should & the process is now less stressful to me,

No I have not ridden them yet, but I will be soon.

This inexpensive Klein Quantum is going to fly I suspect, & I will most definitely post a road test report once I do!


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