Mach Attack: Pivot Mach 429

A while back I bought a MTB – a 2011 Giant XTC 29er 1 Hardtail. After some months of riding and racing, and a suffering back to boot, I decided I needed to go Full Sus to alleviate the back pain and keep up with the sport. To alleviate the wallet pain, I determined to graft as many parts as possible from the XTC onto a new frame.

So, after much research (I wanted to stay with the 29er theme) and some trusted advice from the guys at Cycles Bespoke (thanks Chris and Angus!), I ended up with a 2012 Pivot Mach 429 frame (Large size).

So, straight into some piccies! (click on the pic for a larger version)

Here's a shot of the non-drive side of the bike - looks really nice in stealth anodized black.

Drive side of the bike.

Drive side again from on high.

Front of the bike (bell has now disappeared - not a useful tool on the trail!).

Cockpit - the original XTC Giant 110mm stem has now been replaced with a 90mm Thomson for a little more control and reduced reach. The BBB flat bar has also been replaced with an FSA K-Force 18mm riser bar - slightly less backsweep but more width and a slight upsweep. Also, new brake system - XT levers here.

Front end showing the Fox F29 100 RL fork with 15mm Thru axle, Sun Ringle Black Flag Pro 29er wheel fitted with Schwalbe Nobby Nic Evo Snakeskin bag, and the new Shimano brake setup (XT caliper with Ice-Tech Rotor and Pads).

Mid-bike drive side showing the Pivot's DWS suspension featuring Fox RP23 Kashima Coat shock.  Pedals have been changed to XT Trail style.

Mid-bike non-drive side DWS suspension.

Chainset drive side.

Rear wheel disc. Axle is 142 x 12.

RD and 11-36 cassette. Schwalbe Racing Ralph Evo Snakeskin bag.

So, how does the sucker ride?

Well, this is just going to be a 'first impressions' of the frame and ride write-up, because I've done probably just over 8 hours of racing on the bike: that and my relative newness to MTBing means I am nowhere near competent to ride at the level or conditions this bike can cope with, nor I am sufficiently schooled to incisively comment on its capabilities or ultimate performance.  Still, a few observations can't hurt?

First off, the bike is as stiff as a plank on the trail: no squirms, wallows or flexs.  It goes where it's pointed and stays there (the fact that the pilot doesn't always point it where it should go is not its fault!).  The frame and axles are basis of this, with the Sun Ringle wheels also exhibiting ample lateral stiffness.

I've experimented with the suspension settings front and rear over the course of races (including a 4 hour enduro during which I tweaked a little) and arrived at a good setup for me.

The Fox fork is set to 22% sag (for an 87kg guy like me that equates to 90psi in the fork) which gives it a reasonable compromise between total amount of travel, small-bump compliance and bottoming out. Rebound speed is set to the fast side of middle - no pogo-ing but quick enough not to pack down under repeat hits. May have to experiment with oil volumes a little - I would like a little more small-bump compliance but decreasing air pressure leads to more bottoming.  Still, the fork is elegant rather than drastic when it bottoms, and the travel is progressive and rates ramp up nicely with good feel.

The DWS suspension with the Fox RP23 Kashima shock is just perfect.  The shock has various pro-pedal settings but I just don't use them - it stays fully open. Set the correct sag via the indicator and it's all go. The DWS suspension is like the proverbial magic carpet - rolls over everything with no fuss.  I really do forget about it - I know it has bottomed out but only because the indicator tells me so. No pedal bob, no loss of propulsion or motive power, no stiction - it feels as efficient as my old hardtail.  Except when it comes to climbs - there it tears the HT a new one. This thing climbs like a rocket strapped to a set of wheels. Just sit down and crank it out is my advice.

Making the switch to the XT brakes has been a revelation. Power is incredible but the modulation of that power is even better - 1 finger braking, no matter the level of stopping force required, is the reality, and it's one less thing to concentrate on.    

I am so much loving this bike right now, and I am feeling real progression in my riding each time I go out on it.  It's great coming to grips with the trail, and having a bike which isn't putting any obstacles in my way performance wise lets me concentrate on what I can achieve out there.  I'm confident I'll never be limited by this bike in the XC environment - which is a great thing to know.

Ride Safe!

Report – Michelin Pro 4 Service Course Tyres and Shimano Ultegra 6700C Carbon Road Pedals

Michelin Pro 4 Service Course Tyres

As blogged a while back, I decided to go back to Michelin tyres on my roadie, specifically giving the new Pro4 Service Course Tyres a go.

I documented my initial impressions were good, with excellent cornering and feel, but with the caveat that I had no idea how they would wear.

Well, a follow up to that: I still have no idea how they wear because they didn't last that long! Bought 4 new tyres, and within a couple of weeks 3 of them (I never put the 4th one on) had been rendered useless by cuts caused by glass shards.

These tyres seem to be very sensitive to any amount of glass, no matter how tiny – in short they have no discernible puncture protection at all. What's more, when they were cut by glass shards, all three experienced lifting of the outer tread from the inner carcass along the cut, so the old super glue fix didn't work. Three tyres disposed of after less than 100 kms on each – not a stellar track record! Needless to say the remaining tyre sits forlornly in a cupboard whilst the reliable Vittoria Rubino Pros went back on where they remain to this day: same pair after 1000 kms with no punctures, even picking up a little glass on the way, which incidentally would have seen the Pro 4s self-demolish!

So, Michelin Pro 4s – no thanks!

Shimano Ultegra 6700C Carbon Road Pedals

Short and sweet: I put them one, they look nice, save a little weight, and feel great under foot, with a wide platform and sensitive tension adjust. After that, forgot about them!

Recommended!

Ride Safe!