Big Mountain Riding

Attack of the 650B-wheeled Carver Killer B

Compiled from the Dirt Rag Blog, twentynineinches.com and MTBR.com

Oddball bike sets the big wheel world abuzz

Think Goldilocks and the Three Bears: 650B wheels may be "Just right." - from twentynineinches.com

Talk about trial by fire: Dirt Rag’s Karen Brooks rolled her test bike directly out of the office and up to the starting line of the brawny Shenandoah 100, lingering only long enough to swap out a few components on the demo for more familiar ones. Luckily, the Killer B from Carver Bikes is an adaptable rig that lends itself to easy transitions for riders of 26″ or 29″ wheels – the 650MM wheel diameter translates to roughly 27.5″. Speaking of adaptability: following the Shenandoah 100, the Dirt Rag stripped the Killer B down and headed west for the Single Speed World Championships (SSWC) in Durango.

Just like 29″ wheels did, the 650B diameter is sure to draw staunch critics, blind worshipers and a whole host in-between – as well as a lot of “Huh? 650B – what’s that?” And with cycling consumers already primed for the revolution following the rise of the 29-er, the 650B wheel meets both more ready acceptance and more competition for critical comparison.

It seems that much of the reaction to the 650B wheels depends on whether the reviewer is throwing a leg over the Killer B after dismounting from a 26″ or a 29″ bike. To draw on Karen Brook’s Goldilocks analogy – whether the 650B porridge is warmer or cooler depends on which porridge dish you last sampled. Regardless, it seems for a swath of both wheel-size-camps, the 650B may be “just right.”

For those tuned to the 29″ style, the 650B opens dialogue on where “smaller” big wheels might fit in. Karen Brooks was happy with the way the Killer B snapped about in the brutally tight and twisty SSWC course and in the narrow, tree-lined singletrack of Shenandoah Mountain.

“I might choose something like this for an ultra tight, technical course with a fair amount of climbing,” allowed Guitar Ted, from twentynineinches.com.

Killer B's drop-outs come with a d-hanger or slotted for SS

Testers liked: the Killer B’s fast handling in tight turns and technical sections. This from 29-er folks, giving the mid-sized wheels their due. Meanwhile, a shorter reviewer, coming from 26″-wheels, liked the way the bigger wheels hooked up and stayed connected in corners and climbs without overwhelming their bike’s small frame. “[The Killer B] Climbs like a demon on steroids,” enthused a reviewer on MTBR.com. The smooth, stiff ride of the titanium frame and the no-charge customized sizing options also drew praise. “Out on the trail I thought, ‘Gee, this feels pretty good.’ in that fast, nimble sort of way,” said the reviewer for twentynineinches.com

Testers disliked: That 650B wheels rode a bit harsher, and struggled for traction more than 29″ wheels would in the same situations. Guitar Ted felt that that 650B wheels do not generate the momentum and the roll-over capabilities that converts so many to the big wheel faithful. “On wet roots, I still might prefer to go big (in wheel size, that is),” said Karen Brooks. Currently, there are not many options for off road tires and wheels, meaning no narrow knobbies for purchasing traction in the snow or the mud.

Indie bike, Indie attitude: Killer B rocking the mono-cog

SPECS:

- 3/2.5 Seamless Aerospace Titanium with X-Rayed Welds
- Machined box section head tube gusset
- S-bend chainstays and seat stays for clearance up to 2.6″ tires
- Choice of threaded bottom bracket or EBB, derailleur hanger or single speed dropout
- 27.2 seatpost size and 1 1/4″ front derailleur size
- 13″, 15″, 17″, 19″. 21″ and 23″ sizes
- Custom sizing at no extra cost
- 6 mm. water cut dropouts with rack mounts

Cost –

Frame: $1099.95 Full-Build: +/- $2000

Read the full Dirt Rag Review.

© 2009 Big Mountain Riding

“Single speeds make you work smarter. Even if you’re a geared rider at heart, riding a single-speed occasionally makes you a better, more efficient rider. Being efficient is key to single-speed and why I’ve been able to compete with geared riders.”

- Fuzzy Mylne, Single Speed champion

Setting up for Single Speed Success

- Excerpts from the Mountain Bike Action interview with 29er’s John “Fuzzy” Mylne

Vic Armijo interviews Fuzzy Milne, a single-speed racer who has been posting some impressive finishes out west in the epic race scene. Taking 6th place overall at the 2008 Sierra-Tahoe 100 pitted him against such epic race champions as Jeremiah Bishop, Chris Eatough, Tinker Juarez and Josh Tostado. The man knows a few things about racing single-speeds, and he shares his top tips to help you become a better rider.

Fuzzy rides single-speeds fast ... So can you!

1. Work your way up to being a single-speed maestro. “Take it easy in the beginning and avoid steep or long hills until you get the rhythm of it and learn how to climb without overdoing yourself every time,” advised Fuzzy. This will help you prevent the much-discussed strain on your knees that can come along with single-speeding.

2. Get the most out of your guns. “Strong arms and overall upper body strength is a definite advantage for getting a little extra power for getting up a hill by working the bike back and forth like a sprinter out of the seat, but in slow motion. Wide riser bars will give you more leverage for working the bike. And I’m big on bar-ends—just pull on those as hard as you can to help leverage the cranks around.”

3. Keep the front end weighted. Yanking on the bars and lunging with each pedal stroke while climbing can make it challenging to keep the front wheel planted. Fuzzy counteracts that by using a lower front end, “I put fewer headset spacers and a flatter stem to help me to keep my weight forward when I’m climbing and standing.”

4. Momentum is your amigo. With gears, many riders make speed by powering into corners, scrub speed late and forcefully, roll the corner and then put the power down to speed out of the corner. However, Fuzzy observes, “On a single-speed you might find that your gear is too low to really accelerate out, so instead keep your speed up and stay off the brakes.” He adds, “Momentum’s key for a single-speeder in other ways; keep your momentum on the rolling hills, especially the short steep ones. And truly I’m only working half the time compared to the geared guys. I work on climbs, but every where else I’m drafting off of them and recovering.”

5. Spin more, bonk less. Many elite SS riders push big gears, but Fuzzy, a former roadie, chooses lower ones comparably. “I like to keep a higher cadence. You’ve got to put the miles in at a high cadence for your body to get used to that.” And he gears down even more for real epics, “I want to be able to sit and climb as much as I can to save energy.” He generally makes his gearing variations on the rear, “I use the same chain-ring, a 32 tooth on my 29er, and I used 34 when I was riding 26-inch wheels, then use anything from 17 tooth cog to maybe a 21 or even a 22 if the course is really, really steep.”

Read the whole interview with Fuzzy Mylne at Mountain Bike Action online.

© 2009 Big Mountain Riding