The Siren Song

I met Brendan and Mary Collier at the Kaibab Mountain Cross in June.  Brendan is (among other things I'm sure!) a custom frame builder and owner of; Mary races them.  Purty fine mojo for this power couple if you ask me.

Siren doesn't do just any old frame design...the one that really fires Brendan up is a 26" rear wheel and 29" front wheel design.  I rode his bike a little at KMC and really liked it.  That big front wheel floats over stuff, and with the normal back wheel size the drivetrain gear ratios are what I'm accustomed to.  The drivetrain issues were a constant issue for me when I rode 29ers in '05.

Shortly after KMC I started working with Brendan on design ideas for a new bike he's coming out with.  OK the ideas are his and I supply the excited anticipation.  Oh wait he's full of that too...anyway, to make a long story short, the new bike is a 26/29 softail design in the vein of the Salsa Dos Niner, but with close to twice the travel and more careful tuning of the suspension characteristics.  She's in the jig and nearly a frame now.  Here's how it looks so far.

The artisan in his element.

Lot's of standover in this beauty.

I think he's done this before!

The lower end consists of a titanium flex plate and another brace (not shown).   

What's the coolest part of this design?  Hard to pick one...but if I had to I'd say it's the action of the rear travel.  There is some negative loading built into the design, meaning the shock will be tuned to get the appropriate sag, and it will be active!  The Dos' rear end was rock hard to me - I'd get maybe 1/2 to 2/3" travel hucking something stupid - but this design will be active for any rider weight, and the Cane Creek AD5 will provide all the tunability required to dial in the sweet ride.  So there you go, a bit more info that the teaser here:

The bike will be known as the Siren Song and both Mary and myself will be doing some serious R&D at Moab.  The anticipation thickens!

Published Thursday, September 20, 2007 4:50 AM by Dave


# @ Thursday, September 20, 2007 10:14 AM

Wow. This is going to be a cool bike. Any guesstimates on the frame weight w/shock? I have yet to ride a 29er or 69er but I am intrigued by the potential of this frame...especially if it comes in as light as I think it will.

I am looking forward to your initial report.

dave byers

# @ Thursday, September 20, 2007 10:28 AM

Best guess for the first pass is 3.5 lbs including the shock. It could go over that? We'll be fine-tuning the design, honing the suspension, rigidity and all over time. But that's close I'm sure. Almost 2 lbs lighter than my Lev frame...and it's a 25 lb FS 29er built up. The Siren Song should be in the 23 lb range.


# @ Thursday, September 20, 2007 12:08 PM

That is one of the coolest names for a bike I have seen. After all, how many times are we seduced by the siren song of a big, epic day?

Can't wait to see it down at Moab.

Adam L.

# @ Thursday, September 20, 2007 1:03 PM

You sure know how to let those cats out of the bag!! I'm super stoked - see you at Moab!


# @ Friday, September 21, 2007 12:06 AM

Looks cool!

v's so you can use your squiggly line hub?

Have fun with Jeff


# @ Friday, September 21, 2007 8:36 AM

Look what I got...

She's gonna be hot!


# @ Friday, September 21, 2007 8:53 AM

I'm as excited about this as Dave is! We're building two right now; one for Dave & one for Mary. His will be sturdy & stiff in all the right places, while Mary's will be very light.

We put on the squiggly-line friendly canti-bosses yesterday.. I made a nice little jig for it & they turned out really nice.


# @ Friday, September 21, 2007 8:48 PM

Dave, the new bike looks cool, but where's the little bell on the handle bar to make that siren song ring?

Been is good. Sorry to hear about your ankle. I had shoulder repaired this summer so no bikie for kv as well.

I'm going fishing with Timp down the Gunny Gorge in a week, can't wait for 3 days with the old school.

See you next time I go to Zion, man.