Remember that exclusive we got on Tune’s latest Princess Skyline mountain bike hubs? The front weighed just 78g. Well, now a limited Princess 30 years Uli edition shaves another 10% more off what had already become one of the lightest disc brake hubs available, and we know how they did it…

Tune Princess 30 years Uli edition ultralight mountain bike hub

Tune Princess 30 years Uli edition ultralight mountain bike hub
c. Tune

The production Princess Skyline already got down to 84g with the most recent move to centerlock rotor mounting. Then, the preproduction Princess Skyline from back in May had dropped under 78g thanks to more careful machining and the use of carbon endcaps. Now this latest tease brings the hub weight below 70g. How did they do it?

Tune tells us there are three main tricks: those patented carbon endcaps that we broke the story on (which will soon be offered on all Tune Skyline hubs), new lightweight ceramic bearings around the 17mm alloy axle, plus a new secret aluminum alloy from which Tune machines the limited edition hub body.

The Tune Princess 30 Uli edition front hub should be available after Eurobike to fit 12 & 15mm thru-axle & QR wheels, but not Boost spacing, making it an ultralight choice for XC, CX, gravel & road disc. We will have official pricing & availability estimates in a couple of weeks, and hopefully news on a matching ultralight Prince rear hub…


  1. Yeah but even most XC race machines these days are coming with boost spacing, so not making these boost compatible is kinda silly. For an ultralight road/gravel bike I can see them being neat though.

      • There isn’t a boost version of this exact hub, which is what I’m talking about, since that’s what the article is talking about.

        • The Princess Skyline boost front is 93gm. You really going to split hairs over 23gm?..ok then. That’s the weight of about four nickels and a penny. Give your address, I’ll send you .21¢

          • 23gm doesn’t sound like much in the context of pocket change, but it’s 30% more than the featured hub and that’s a lot. As long as we’re counting in grams, this counts to the people who would open their wallets to buy it.

            • A boosted version of this hub would most likely weigh in at 78gm, same as an Extralite Hyperboost. Could the weight weenies deal with the extra 8.5 grams of heft?…probably not. Better off staying in bed whining about the weight of what are already a couple of the lightest disc hubs on the market than actually riding.

  2. i Have a real light, hardly ridden, carbon wheel set with Tune hubs just hanging in my garage unusable because the spoke hole just broke away. Luckily this happened while I wasn’t using them. I prefer a little more weight if it means they will safely hold together.

  3. My friend assembled a wheelset based on Extralite Hyperboost hubs (78g+162g) dedicated for XC racing and they still work, at least for now. How will it fair in 3-4 years, we shall see…

    I prefer DT 240s hubs – lightweight, but strong, easy for mods (different ratchets) and maintainance. Plus the abundance of spare parts.

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