Banshee Rune Review

Since the Rune review was done in our old format I thought it would be a good idea to consolidate it all under one Post for easier reading.

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Design Aspects with Engineer Keith Scott

Rune designer Keith Scott’s words on the finer points of the frame.

MTBGearTech:

Tell me about the VF4B suspension design.

Keith Scott:

The VF4B design allows fine tuning of a number of parameters of the suspension characteristics. With careful manipulation of pivot placement and linkage geometry I can create the axle path and leverage ratio, as well as a number of other suspension characteristics that I want for any given riding discipline. Bike design is always about optimization, (e.g. reducing frame weight, tends to also reduce strength, so you have to find the optimal balance of the 2), the job of the designer is to pick the optimal characteristics to ideally suit the intended riding style.

For example on the Rune, I wanted the bike to pedal well, and yet be really confidence inspiring on the downhill’s when things get steep and nasty! So I gave the rune a fairly rearward axle path to offer greater stability to the rider on the downhill’s, but made sure that as the bike moved through its travel the rate of chain stretch decreased to minimize the effect this had on pedal kickback when pedaling over rough terrain. A lot of time was also spent calculating the instantaneous center path (and as a result the anti-squat characteristics), and fine tuning the geometry to be ergonomic and efficient. The braking characteristics of out VF4B bikes are also optimized so that the suspension is between 70% and 90% more active than equivalent single pivot bikes, yet still offer the rider some brake squat to keep them well balanced under heavy braking. All of our bikes are very carefully designed to optimize their geometries and ride characteristics to suit the discipline of our great sport that they are designed to excel in.

It is important to realize that suspension linkages don’t mean anything if the structural strength and stiffness is not there to make the most of them. I’ll speak more about that later.

The VF4B designs all use polymer bushings instead of bearings, to offer a lighter, stiffer frame, whilst being cheaper and easier to replace. The pivots all have direct grease injection posts so that you can grease all the pivots in 2 minutes before or after a ride.

MTBGearTech:

Explain “leverage curve” and its influence on the design of the Rune.

Keith Scott:

The leverage curve is an important characteristic of suspension performance. Two things must be considered:

#1 what discipline of riding is the frame being designed for:

For example, on a trail bike you want a subtle built in low leverage platform so that the bike pedals incredibly efficiently without the need for any pro pedal, yet not so much that it makes the suspension feel dead. On a slopestyle / jump / 4x bike, you want a very progressive leverage ratio so that the suspension ramps up as it goes through its travel so that the frame takes the big hits without harsh bottom outs, offering the rider greater control, forgiveness and cushioning when on the edge. And on a DH race bike it is a little like merging all of the above it is very important to have a fairly high leverage ratio at the start of the travel to keep the suspension supple over small square edge bumps to offer the rider greater traction. Yet ideally (as is the case with the legend) there is a subtle pedal platform designed into the leverage ratio giving the bike great acceleration out of the gate and corners, whilst also offering a stable pedaling platform when you have to hammer over flat sections. And obviously you want some progression built into the linkage so that you are not constantly bottoming out your bike, which causes a momentary loss in control and traction.

#2 what shock will be used with the frame:

For example a small volume air shock is a lot more progressive than a coil shock, so this must be considered when designing the leverage ratio curve to give the optimal suspension performance when the frame and shock are combined.

However it is important to understand that leverage ratios are not the only factors that control the suspension performance, chainstretch, anti-squat and axle path also play a big part in controlling how the suspension performs as it moves through the travel. (Also remember that all these characteristics vary continuously as the suspension compresses)

MTBGearTech:

What makes the Rune’s tubeset unique?

Keith Scott:

The Tubeset on the rune is designed to offer a high strength to weight ratio, and is aligned to offer maximum stiffness. The top and downtube on the rune are triple butted custom hydroformed 7005 T6 ovalized tubes which are incredibly strong for their weight. Let me break that down.

Triple butted means that each tube has 3 wall thicknesses with a smooth contour between each. The wall thickness are designed to be greater where the stresses are higher (where there is load on the tube, or where it is welded to other tubes) to increase strength, and thinner where the tubes are not likely to experience high stresses to reduce the weight. This can achieve a strength to weight ratio far greater than straight gauge tubing.

7005 Refers to the Aluminum alloy and T6 refers to the grade of heat treatment the frame has received to further increase the materials structural properties, as well as reduce stresses in heat affected zones around welds amongst other things.

On the rune the downtube is ovalized to increase the strength of the tube to withstand the directional loading of the shock.

The chainstay and the seatstays of all our bikes are internally ribbed and aligned to offer incredibly laterally stiff frames. Just try riding one sometime and you will instantly know what I mean. Lateral flex on frames results in loss of input energy to pedaling, as the power you exert on the pedals can cause the frame to flex rather than get transferred to the back wheel to accelerate you forwards.

More technical information about our bikes can be found here (http://www.bansheebikes.com/technical.html)

MTBGearTech:

What were the overall design goals for the Rune?

Keith Scott:

The Rune is designed to be a true all mountain bike, it pedals uphill amazingly well for a 6″ travel freeride capable frame, and descends as well as most downhill bikes. It is light weight, but not at the expense of loosing strength. It is a true rider’s bike that can cope with pretty much anything you can throw at it. I received an e-mail from a customer a while back who podiumed in a highly competitive regional downhill race on the rune one weekend, and then competed in a 100mile endurance race the next weekend on the same bike. The only thing he changed where the wheels. This shows the rune’s versatility, it jumps and drops well, corners like it is on rails and yet can still pedal to the top of the hill with ease.

The Build

This build is definitely an exercise in durability over weight savings. The Saint cranks, 1.5″ Domain, and Mavic EX823 based wheelset will provide reliability for the many various ways in which this rig will be used. Bike parks, shuttle runs, and extended trail rides on technical singletrack; this Rune will see it all. I’m a fairly stout guy, weighing in at 210# with gear. I had to take that into consideration when choosing components for the build.  I am particularly excited about the custom built wheelset from ChainReactionCycles.com.  They hand build extremely solid wheelsets that are very competitively priced and always delivered quickly. The Mavic EX823 rims combined with the FireEye Excelerant hubs will undoubtedly withstand tons of abuse for years to come. I didn’t want to sacrifice durability and reliability for the sake of saving weight. The only thing that I could see changing in the future would be the swapping of the Domain for a Lyrik Solo Air and perhaps having a lighter wheelset to run on trail days.

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  • Frame: 2009 Banshee Rune size medium
  • Shock: 2009 Fox DHX 5.0 Air
  • Fork: 2008 Rockshox Domain 302 U-Turn, 115mm-160mm, 1.5″ Steerer
  • Brakes: Formula Mega, 203mm front, 180mm rear
  • Hubs: FireEye Excelerant 10mm rear/20mm fromt
  • Spokes: DT Swiss Champion
  • Rims: Mavic EX823 UST
  • Tires: Schwalbe 2.4 Big Betty UST or 2.5 Muddy Mary UST
  • Crankset: 2008 Shimano Saint 34t 165mm
  • Pedals: Easton Flatboys
  • Cassette: SRAM PG-980 11-32t
  • Rear Derailleur: SRAM X.9
  • Shifter: SRAM X.9
  • Chainguide: Gamut P20 BB Mount
  • Chain: SRAM PC-991
  • Headset: FSA Big Fat Pig 1.5″
  • Stem: Sunline V-one, zero rise, 50mm reach
  • Bars: TruVativ Holzfeller, 50mm rise
  • Grips: Raceface Good ‘n’ Evil
  • Saddle: Sunline V-one Ti
  • Seatpost: Promax
  • Build Weight: 35.6#

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Frame Specs:

Tire Travel Fork HA SA BB
26×2.5″ 6″ 6″ 67° 71° 14.1″
Size: S M L XL
Top Tube: 22″ 23″ 24″ 25″
Seat Tube: 15″ 16.5″ 18″ 19.5″
Chainstay: 440mm
Standover: 730mm 760mm 785mm 812mm
Wheelbase: 1090mm 1120mm 1145mm 1170mm
Head Tube: 1.5″
Seatpost Dia: 30.0mm
BB shell: 73mm – isis 118mm
Chainline: 50-51mm
Chainguide: ISCG 2005
Shock: 7.875″ x 2.25″
Shock Type: Air or Coil
Suggested Sag: 15% – 20%
Suggested Sag: 15%

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Ride Report:  Snowshoe Mountain Bike Park

Overlooking the Basin Side of Snowshoe MTB Park

Two days of lift riding with clear skies and a bike that feels like it can do just about anything. This weekend will be remembered as one of the best times I’ve ever had on a mountain bike.

Photo by Mark Poore: http://hotshots-photos.com

The Rune was designed to be an aggressive all-mountain ripper. Part of the all-mountain discipline involves pointing the front end downhill and tearing up gnarly terrain at warp speeds. What better way to test this aspect of the bike’s ability than to spend two days at Snowshoe Mountain Bike Park riding the lifts up and allowing gravity to work its magic on the way down.

Photo by Mark Poore: http://www.hotshots-photos.com

So, how did the bike handle the high speed and super technical descents? Amazingly well as a matter of fact. Here are my thoughts broken down into categories:

Geometry:

The Rune has a fairly neutral geometry that leans more toward that of a trail bike more than it does a Worldcup downhill racer. Having said that there were very few times that I felt the bike becoming unstable or twitchy at higher speeds. It handled the steep technical sections of Snowshoe’s Basin Side very well while also being comfortable in the higher speed sections of the Western Side. This bike absolutely rails berms to the point of making you feel as if you were shot out of a cannon upon exit. The Rune felt very playful on trails like Missing Link and Powerline which are full of great jumps and awesome berms. It begs to go faster and bigger without ever making you feel like you don’t have enough bike under you. I realize I’m not talking geometry numbers here but to me the term geometry is synonymous with the word synergy. When there is synergy in the frame’s geometry and the components that are hung off of the frame everything comes together to form a symphony of effortless riding. This build has awesome synergy; it’s one of those things that makes you smile uncontrollably.

Suspension Performance:

This is what makes this bike so special. Banshee’s VF4B design is one of the most capable suspension designs I’ve ever ridden. The first run of my trip was down three linked trails on the western side that are a bit more buff which allows you to maintain fairly high speeds. Because of this they are very popular which was apparent in the amount of braking bumps before the berms from the previous day’s riding. I was rolling along at a good clip when I came up to the first berm and saw some pretty nasty chunder that started about 30′ out from the berm’s entry point. It was one of those times where you take a firm grip, squeeze the brakes and gnash your teeth because you know that it’s going to be a rough go on a 6″ travel bike. To my surprise, even with a handful of brake, the back end stayed very active and glued to the ground. After that it was,”bring on the bumps. who needs brakes!” Not only does this suspension eat braking bumps and square edged hits, it also offers extremely efficient pedaling. It sprints out like a hard tail and exhibits little to no bobbing when hammering down on the pedals. The Rune makes excellent use of it’s 6″ of travel. It has a linear feel right up to the last 15%-20% of the stroke where it ramps up nicely to give that deep feel while eliminating harsh bottoming.

Banshee designed the Rune to work well with a large volume air shock. I’m using a 2009 Fox DHX 5.0 Air which is a shock that I’ve used on other bikes prior to the Rune. I’ve never been overly impressed with the DHX 5.0 Air, it’s a nice shock for sure but it just wasn’t as good as a coil shock on those other bikes. The Rune on the other hand has excellent synergy with this shock. Fantastic small bump sensitivity and none of the lack of midtravel support that so many complain about with the DHX 5.0 Air. Setup was very easy as well. Just dial in the 15%-20% sag, adjust the boost chamber pressure (compression) to your liking and dial in the bottom out as needed. It took me about 15 minutes at a local ride spot to get the back end perfectly dialed in.

The entire suspension system works smoothly and flawlessly. The bushings (rather than bearings) don’t seem to impart any additional friction on the system and they provide a slop free controlled movement. This design allows you to just go out and ride without having to consciously think about compensating for an inferior rear suspension. Banshee has a real winner with this design, great job guys!

Frame Stiffness:

Anyone who’s ridden a Banshee knows they have a reputation for being super stiff and the Rune is no exception. It shows virtually no flex when wrenching around on the rear wheel or during a ride. The bushings in the pivots have no slop at all and undoubtedly contribute the stiff back end. The seatstays and chainstays are internally ribbed allowing a much higher stiffness to weight ratio. There’s not much more to say, this frame is stiff.

Conclusion:

The Rune was not designed to be a park bike but it does hold it’s own when things get fast, steep and gnarly. While it’s geometry allows it to be a capable descender it was designed to be more of an all-arounder which means it isn’t going to make tearing through a big rock garden at warp speed an easy task but that’s what the big rigs are made for. What the Rune does allow you to do is to go on an all day epic one day and spend the next day in the steeps, berms and jumps of your favorite lift or shuttle served park. I can’t wait to get out on an epic backcountry exploration on this meticulously designed bike. The Rune is just fun to ride no matter where you are.

Coming off of the sick Raging Bull trail's 14' high wall ride.

Ride Report: Horn’s Hill Freeride Park

Horn’s Hill is an amazing public freeride park in Central Ohio. The trails are fairly smooth with some of the nicest berms, jumps and features I’ve ever come across. A 6″ travel bike is perfect for Horn’s Hill and the Rune did not disappoint.

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The geometry felt perfect, quick and stable best describe how the Rune behaved on the Hill. It jumped predictably and handled the 4′-6′ drops very well. The Rune delivers some nice pop off of the lips of jumps and loves to be laid over in a berm. Horn’s Hill is all about speed and maneuverability, two things the Rune does very well.

There is a short but very steep and technical rock garden at the end of one of the four trails on Horn’s Hill. The VF4B suspension handled it with ease and showed no signs of hanging up or slowing down on the multiple square edged hits. The back end stayed very active under braking as well keeping the rear tire glued to the trail allowing predictable and effective deceleration.

There’s not much else to report from the Horn’s Hill trip. It’s all about railing berms and air time on the Hill and the Rune let me wring every ounce of fun out of the day.

Ride Report: Alum Creek

The members of the Central Ohio Mountain Bike Organization (COMBO) have constructed an really great XC/Light FR trail system near Columbus.  I don’t have any pictures or videos from this trip since I went it alone and just wanted to get out for a ride.  Even though this was just a day out on the Rune I feel it’s necessary to comment on it’s performance.

The Rune performed extremely well on these trails.  They are strewn with short technical climbs and descents along with some great man made wooden features.  The Rune’s versitile geometry was comfortable anywhere I took it and having the ability to drop the front with the RockShox Domain’s U-Turn feature made the climbs a breeze.  The Rune’s suspension remained active even under the hardest of pedal mashing but also provided emense amounts of traction while effeciently transferring my pedal strokes into forward motion.  The wheelbase is short enough to make tight turns easy yet long enough to keep it from feeling too twitchy on fast descents.

So far I’ve taken the Rune downhilling, on some nice slopestyle trails and for some true trail rides.  Each time I pull the Rune out of the quiver for a ride it puts a smile on my face.  Saying that it is versatile would almost be an understatement.

Looking Back…

I started off the 2009 season with the Rune and after initially building it up I was a bit worried that it wouldn’t be enough bike for the type of riding I was planning on doing.  My assumptions couldn’t have been more incorrect.  The bike not only handled everything I threw at it but excelled in every situation.  It’s reasonable weight and extremely efficient suspension platform made trail rides extremely fun.  It handled true DH and FR trails very well while giving the rider the feeling as if there were much more than 6″ of travel out back.  The suspension was simply brilliant under every circumstance; it exhibited no braking induced squat or stiffening, handled square edged hits very well and allowed for efficient pedaling.  The geometry of the bike made it instantly comfortable and is neutral enough to handle many different types of terrain and riding disciplines.  If you really need a bike that can handle a very broad spectrum of riding the Rune should be at the top of your list.

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