Don't Stop Believing

Lots of new frames popping up this week. Had to check my calendar to make sure it wasn't Interbike time. It's not. Still, it seems like nearly every company introduced a new frame, including Eastern:


At a glance, it looks relatively normal, by which I mean it doesn't have all sorts of slots and holes drilled in it. Perhaps Eastern has moved beyond NASCAR technology. But look closer and you'll find a few, um, eccentricities. Like a proprietary (and seemingly arbitrary) bottom bracket width, and an offset-butted headtube.

Start with the wider bottom bracket. Eastern went from the 'standard' 68mm width to 82mm. Which makes some degree of sense, for the reasons they give:

"The BB is 82mm wide verses [sic] the standard BB that is 68mm wide. This spreads the bearings out to increase the strength on the spindle and bearings by putting the load closer to the bearing. The wider BB also allows the stays to be welded further apart to increase the strength and to allow for straighter chain stays and clearance for a 2.3 tire."

The traditional 68mm width always made more sense for road bikes with their skinnier tires, and even they went wider with outboard bearings (although the BB30 system represents an attempt to bring it back to 68mm—and you thought BMX was confusing). Meanwhile quite a few downhill bikes already use 83mm bottom bracket shells.

That said, there's a couple other things to take into consideration. Number one, you're gonna need a whole new (presumably Eastern) bottom bracket setup. Not the bearings themselves—those'll be of the standard mid variety—but a new, wider tube spacer and some thinner washers to go in between the arms and the bearings. And even with all that (consideration number two) I wonder what this'll do to your chainline? I'm sure it's been tested—after all, Josh Perry pulled a 720 tailwhip on one!—and it's only 7.5mm per side, but my drive side washer is pretty thin as it is.

The offset headtube shouldn't provide any problems. It could if you still had to hammer cups into it, but those days are long gone, and companies are doing far worse things to headtubes these days. If Eastern wants to save a few grams by making a simple headtube more complicated, that's their problem. Besides, it sort of goes with the similarly offset-butted Lightning Rod downtube.

Everything else is pretty normal for a late-'00s frame: Japanese (presumably Sanko) tubing, removable mounts and guides, machined dropouts, built-in chain tensioners. But I'm most excited about a holdover from the late '90s: an ovalized (at the bottom bracket juncture) seat tube. Again, this should make the frame somewhat stiffer, but it's also a homage of sorts to this. Which is never a bad thing.

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