Carbon or Aluminum for Full Suspension Bikes

The marketers have already won over many of us that carbon fiber must be the better material for bike frames.  But...how many of you have actually tested this assumption.  The benefits of carbon fiber are undeniable in theory.  Carbon fiber offers the same strength as an aluminum bike at less weight.  Carbon fiber offers, at least in theory, more tunable ride characteristics.

I did a subjective test at the Interbike Dirt Demo of how carbon fiber suspension bike frames feel versus aluminum frames.  I rode several bikes that were similar in intent and suspension travel.  The first test subject was the Specialized Stumpjumper EVO in carbon which honestly did not feel great at either climbing or descending.  I also had a chance to ride both the Devinci Troy in both carbon and aluminum back-to-back.  As I expected, the aluminum Troy felt more sluggish than the carbon Troy.  Case closed, right?  Not so fast.  The last bike of the day was the Transition Patrol in aluminum.  Carbon fiber or no carbon fiber, the aluminum Transition Patrol was one of the best riding and best feeling bikes that I rode at Dirt Demo.

Two lessons learned from this year's Dirt Demo:

1. You can't generalize as to how carbon or aluminum will feel.  Geometry and ride tuning are factors that will likely be more important than frame material in affecting how a bike rides.

2. I need to spend two days at Dirt Demo to answer any questions that come up for me on the first day & answer any questions/requests from all of you! 

Thoughts on carbon vs aluminum?

Interbike 2014: Pivot Mach 6 Bike Review (155mm rear travel)

I am really conflicted about Pivot bikes.  Having owned a Titus Switchblade, I really want to like any bike that Chris Cocalis creates with Pivot.  That said, I have never fully felt comfortable on a Pivot bike and the Mach 6 is no exception.

Climbing - 3 stars

With a focus on descending and heavier weight than many of the other bikes tested today, the Mach 6 was a solid climber, but by no means the best.  The Mach 6's additional weight no doubt affects it climbing performance.

Descending - 5 stars

At least the Mach 6 is consistent in its performance.  Descending feel was super solid and predictable, yet still fun.

Cornering - 4 stars

The Mach 6 is steady and predictable in cornering, if lacking a bit in liveliness.

Summary:  The Mach 6 is a great descending bike at the expense of some climbing ability. It's baby brother, the Mach 5.7, is a super climber, but doesn't feel completely settled going downhill.  Combining the best of these two bikes in one bike would make a killer bike, but other bikes that I rode today (namely the Devinci Troy and the Transition Patrol) actually get close to this ideal.

Rating Guide

5 stars - Absolutely outstanding

4 stars

3 stars - Solid performance, meets expectations

2 stars

1 star - Misses expectations by a wide margin

image.jpg
Dw-link suspension has an initial rearward travel to reduce suspension squatting.

Dw-link suspension has an initial rearward travel to reduce suspension squatting.

image.jpg

Interbike 2014: Orbea Rallon Bike Review (160mm rear travel)

In many ways, this is a different bike than the other bikes I've tested today.  The Rallon is clearly oriented toward downhills and it shows

Climbing - 2 stars

Even at 5 pounds heavier than many of the other bikes I rode today, the Rallon was not a bad climber.  The Rallon was a better climber than the Stumperjumper Evo 27.5 which I had maligned in an earlier review.

Descending - 5+ stars

I give the Rallon 5+ stars because it really is in a totally different league for descending than the other bikes I tested.  When the trail turns downhill, the Ralllon comes alive and feels super confident in a way that none of the other bikes I rode today could match.

Cornering - 4 stars

Cornering on the Rallon could not be described as nimble, but it was super solid in feel.

Summary:  The Rallon is a great bike for those willing to compromise climbing performance for a rock-solid descending feel.

Rating Guide

5 stars - Absolutely outstanding

4 stars

3 stars - Solid performance, meets expectations

2 stars

1 star - Misses expectations by a wide margin

image.jpg
image.jpg
image.jpg

Interbike 2014: Devinci Troy Carbon Bike Review (140mm rear travel)

Wow, I love this bike.  It climbs well and feels both nimble and stable at the same time going downhill.  It rides like a BMX bike with 140mm of travel.  The Troy uses a Dave Weagle designed Split Pivot rear suspension design to minimize suspension feedback affecting pedaling and braking.

Climbing - 5 stars

The Troy feels super responsive to power input when climbing. (The alloy edition did feel less snappy perhaps due to a higher bike weight)

Descending - 5 stars

The Troy was able to feel both responsive and planted when descending.  The feeling of the Troy was really confidence-building while remaining fun to ride.

Cornering - 5 stars

The Troy had a lively, responsive feel that was super fun to ride in corners.

Summary:  Being lively and predictable is not mutually exclusive.

 

Rating Guide

5 stars - Absolutely outstanding

4 stars

3 stars - Solid performance, meets expectations

2 stars

1 star - Misses expectations by a wide margin

image.jpg
image.jpg
image.jpg

Interbike 2014: Specialized Stumpjumper Expert Evo Carbon Bike Review (150mm rear travel)

In many ways, riding this bike was my main event for today's bike demo event.  In terms of specs, it is almost a direct match to the Turner Burner (140mm rear travel) bikes in my demo fleet.  Also, with the number of Specialized dealers in the Seattle area, the is going to be the bike most commonly compared to the Turner Burner.

As this is what I see as the main competition to my demo bikes, I'm sure you won't be surprised to hear that I really didn't like the Stumpjumper Evo at all, but hear me out.  These are the specifics on what I didn't like about this bike.  Also, when reading my comments on climbing, keep in mind that I rode this bike after my legs were warmed up, but still fresh.

Climbing - 1 stars

I can really say why, but climbing on this bike felt super sluggish like it had a loaded diaper.  Other bikes with similar rear suspension designs (Transition Patrol, Rocky Mountain Altitude) felt so much better climbing that I have to attribute the Specialized's poor climbing performance to something other than suspension design.  Shock selection/tuning, frame geometry, bottom bracket height may all play a part.   For 2014, I do know they repurposed a 29er front triangle for their 27.5" wheel bike.  I am not sure if this is why this bike still does not feel good.

Descending - 1 stars

As dull as the Specialized felt climbing, it was the complete opposite when descending and not in a good way.  I never got comfortable on this bike and was generally unsure of how it would react in different situations.

Cornering - 1 stars

Although the Specialized felt nervous going downhill, it also felt big going around corners.  I thought this might be due to its 800mm wide handlebars, but other bikes that I rode later in the day had similarly wide bars and still felt agile in their handling.  Handling was not at all intuitive and required a lot of focus to make sure the bike went in the desired and intended direction.

Summary: What was real odd to me about the Stumpjumper Evo was that this bike had conflicting ride and handling characteristics that were completely wrong for each aspect of its performance.  I was fighting this bike for the entire 20 minutes that I rode it.

Rating Guide

5 stars - Absolutely outstanding

4 stars

3 stars - Solid performance, meets expectations

2 stars

1 star - Misses expectations by a wide margin

image.jpg
Specialized still uses a fairly traditional implementation of the Horst Link which relies on shock damping to control rear suspension movement.

Specialized still uses a fairly traditional implementation of the Horst Link which relies on shock damping to control rear suspension movement.

image.jpg

Interbike 2014: Rocky Mountain Altitude Carbon 27.5 Bike Review (150mm rear travel)

This was a good first bike to ride for the day as it was a solid bike all around. I would be really happy to have the Altitude as my personal ride.  The Altitude uses a modified Horst Link design (pivot in front of the rear wheel axle on the chainstay) with the axle dropped below the chainstay pivot to reduce the amount of bobbing when pedaling.

A key feature of the Altitude is the Ride-9 feature which allows adjustment of the bike’s geometry and shock rate. By moving the position of the rear shock, the head angle can vary from 66.6 degrees to 68.3 degrees and the seat angle between 73.6 degrees and 75.3 degrees. The bottom bracket also raises or lowers by 10 degrees. These adjustments can also vary the amount of leverage on the rear shock to better adapt to lighter and heavier riders.

 Climbing - 3 stars

The Altitude pedaled well, but didn't feel super snappy when laying down the power. 

Descending - 3 stars

Descending was solid and predictable.  The only thing the Altitude really lacked was a bit of immediacy in its steering and liveliness in its feel that the best bikes have. 

Cornering - 3 stars

Not exceptional in how it felt cornering, but completely predictable in feel. 

 

Rating Guide

5 stars - Absolutely outstanding

4 stars

3 stars - Solid performance, meets expectations

2 stars

1 star - Misses expectations by a wide margin

Rocky Mountain Altitude (150 mm rear suspension travel)

Rocky Mountain Altitude (150 mm rear suspension travel)

Ride-9 rear suspension adjustment

Ride-9 rear suspension adjustment

 

Rear axle is dropped below chainstay pivot for better climbing performance.

Rear axle is dropped below chainstay pivot for better climbing performance.