Here's what Ibis say about this frame...

Our brains were hurting after spending the 1900+ hours of cad and engineering time developing the Mojo, so we took a little bit of time off. It wasn't a lot of time-maybe a weekend-and we already were thinking about ways to improve it. That's how we are. The Mojo SL is a result of our own refinements and utilization of some new technologies that have recently become availalble to us.

Differences between the Mojo and Mojo SL are as follows:
The Mojo SL uses a higher modulus higher strength carbon fiber layup. This way we can use less material and get comparable strength and stiffness.
The SL also features compression molded carbon fiber dropouts, compared to aluminum on the Mojo Carbon.
The headcups and seat tube insert on the SL are also carbon (they're aluminun on the Mojo Carbon).
We also use Titanium fasteners (rather than steel) in the Mojo SL, saving a few more grams.
If you add the optional DT Swiss XR Carbon shock, you'll save even a bit more.
All these things add up to a weight savings of about .65 pounds under the Mojo Carbon's weight.

Features of the Mojo SL:

• 5.2-5.3 Pound Frame/swingarm/rear shock (size medium)
• Lopes Link pre-installed
• Ultra high modulus fiber enhanced layup
• Carbon fiber head cups
• Carbon fiber dropouts with stainless steel sheath
• Carbon fiber seat tube insert
• 6-4 Ti fasteners and shock pin
• Matte Clear features special rubberized paint (durable, easy to clean)
• Carbon monocoque frame and swing arm
• 5.5" (140mm) rear wheel travel
• DW-Link Suspension
• Forged and anodized links (now available in designer colors)
• Easy to service pivots and bearings

The MojoSL with the pimp daddy WTF group weighs in right about TWENTY THREE POUNDS. Yes, you're reading it right, we've now got a 5.5" travel All Mountain or XC bike that weighs 23lbs (Euros, that's a hair over 10Kg!). And we're not putting any stupid parts on there, parts that you're just going to take off immediately.