Sun Ringlé Charger Pro – First Look

by Brian Mullin on March 31, 2010

Go to for the full review!

I just got in a spanking pristine set of the new Sun Ringlé Charger Pro wheels for a thorough thrashing. The Charger Pro is an All Mountain wheelset which is available in 26″ or 29″ sizes, featuring tubeless ready aluminum rims that come with swanky labeling that screams, “Go Fast”.

Direct pull rear hub

Sun Ringlé partnered with Stan’s No Tubes to license their patented BST (Bead Socket Technology), to give the Charger Pro rims proven tubeless compatibility. The BST system allows rims to have a wider inside dimension than other designs, offering a wide base for the tire. The design has shorter sidewalls, that help reduce pinch flats and rim denting from running low pressures.

Sealed with Yellow Tape

The wheelset comes with Stan’s yellow tape installed, and valve stems and mini bottles of sealant in the box, so everything is ready to go. The rims are 28mm wide, and use Wheelsmith double butted spokes connected to direct pull hubs, using 24 holes on the 26″ version and 28 holes on the 29er. The kit also comes with 9mm, 15mm and 20mm adapters for the front hub, which is really unique, since most companies offer additional adapters only as an option. The rear hub comes with standard QR 135×9 (as tested), but can be optionally ordered in 135×12 or 142×12 (x12) versions.

Front hub – slot for the adapters and the bearing set

Measured Specs


  • Valve stem – 6.4 grams
  • Adapters – 9mm: 39 grams, 15mm: 35.2 grams, 20mm: 30.4 grams
  • Front- 9mm: 792.7 grams, 15mm: 788.9 grams, 20mm: 784.1 grams
  • Rear – 900.4 grams
  • Total- 9mm: 1693.1 grams, 15mm: 1689.3 grams, 20mm: 1684.5 grams


  • Outside – 28mm
  • Inside – 22.6mm

Rim Dimensions

Front hub 9mm, 15mm and 20mm adapters


I installed a set of normal tires (Maxxis protoypes) on the rims, and initially tried 40-50 psi to get them to pop, but it took 80 psi for the beads to seat. (Note: this was the line in pressure, tires were only filled to 40psi). I let the tires sit as long as possible to stretch out the carcass, and then pulled the valve core and filled them with the supplied 2 ounce bottle of sealant. I re-inflated, and shook the tire while rotating it to get the sealant up into the sidewalls. After a couple of minutes laying on each side (after doing the shake step) the tires were topped off to 40 psi to sit overnight.

I was easily able to install the 9mm and 15mm adapters to the front hub, but I was a bit confused on the 20mm set? It turns out to be a very simple, albeit primitive, process. Just place the 20mm adapter into the slot followed by the ring, then using either a 1 inch PVC coupler (my fave) or a socket, give it a good couple of hits with a mallet, and the ring seats nice and tight! To take it off, insert a 20mm axle into the adapter about a 1/2 inch, and ever so slightly lever it sideways and the ring pops off. Thanks to Scott at Sun Ringlé for the pointers on what he calls the Caveman approach, which I happen to find effective, “Simple is, is simple does.”

20mm adapter install and removal

They are a light wheelset (1690 grams) for their intended usage, so I anticipate good acceleration, quick steering, while the 28mm width should provide decent stability and minimal flex. I like the graphics and red hubs, and I am interested to see how the direct pulls work, and their robustness? Updates to follow.


  • MSRP of $650.00.
  • Stan’s No Tubes BST™ Tubeless Technology.
  • Premium Direct Pull Hubs with Japanese Precision Bearings
  • Wheelsmith Double Butted Spokes
  • Lightweight AM Wheel – 1699g / Pair
  • 26 inch and 29 inch sizes
  • Front hubs are easily convertible to today’s axle standards – 20mm, 15mm and QR end caps included*
  • Rear hubs – standard QR or optional 135×12 and 142×12.
  • Wheels include Stan’s No Tubes Yellow Sealing Tape, Sealant, and Valves*

{ 4 comments… read them below or add one }

Anonymous April 1, 2010 at 5:01 pm

Gram… you're a VERY brave man to put 80 psi into a tire on a Stan's rim ! :-0 Depending upon the tire size Stan usually has maximum pressure ratings stuck onto his rims.
"If" the bead on your tire is weak you are in for a VERY ear popping and eye blinding experience. 😉


Brian Mullin - Gram and Pastajet April 1, 2010 at 11:47 pm

Yes, I have had that experience before with a weak beaded tire. I still have ear damage from that. I wear eye and ear protection when I am filling tires.

Note: this was the line in pressure, tires were only filled to 40psi.


Anonymous July 23, 2010 at 2:34 am

Brian, why you said "optional 12 x 135/142 for the rear hub", does it mean the same hub can be converted? Or it is a totally different rear hub ? Thanks


Brian Mullin - Gram and Pastajet July 23, 2010 at 4:05 am

Same hub, with optional adapters, refer to full review


Leave a Comment

Previous post:

Next post: