Gamut P30 Dual Guide Review

Aug 17, 2010
by Simon Paton  

Gamut Dual Ring Chain guide: Long Term test.

Madison are the U.K Disty for Gamut, click here to see more. Many thanks to them for flowing the Gamut P30 Dual to show you Pinkbike readers.



Imagine the scene: You’ve just grunted your big all mountain/trail rig to the top of your local trail. You’ve sweated and pedalled for over an hour, winching away in the granny ring to wind that big 160mm (6”) rig to the point where all that travel is going to pay for it self. It certainly wasn’t helping on the way up, but it sure as hell is going to help now. You slip on your goggles knowing that this is where the fun begins. Tech trails and big drops. Flow, this is what you came for.

Three turns later and you’re cursing, you look down and your chain is wrapped round the bottom bracket, gutted. Time to stop turn the bike over and get those nice new gloves oily as you try to re route the chain which somehow has managed to lodge itself deep in the recess of the frame and chainset. Flow now utterly destroyed. Mood worsened.

One thing that Downhill racers have always known is that chain security is a key consideration if you want to be sure about getting the bottom of the hill fast. No one would ever think about building a DH rig up without a chainguide. Longer travel means more chain movement and that in turn increases the chances of a chain snarl up. Whilst it is common to see more technical trail riders using a double and bash set up it has been less common to see these types of rider running a chainguide. However over recent years it seems that All mountain and trail riders are catching up and looking at ways of making sure their hard earned plummet time is not spoiled by an errant chain. Increasingly frame designers are including ISCG tabs on their trail designs rather than just the gravity bikes. (For example Orange have recently bit the bullet and included ISCG tabs on their 2011 Five model) It’s all about controlling the controllable.

In the last few seasons chain device makers have been tapping in to this by developing and marketing dual chainring devices that increase chain security for those wanting to run more than one chainring. With this in mind I have been testing Gamut’s offering for the last 6 months on both DH tracks, XC loops and even some Welsh mountain trail centres.

First Impressions-

Upon opening the box you get the feel of a quality product. The boomerang is a nicely anodized red colour on the test model and my fears about a polycarbonate bash ring feeling plastic like and cheap were unfounded. The bash ring has a high gloss finish that makes it look the business. The next thing you notice is weight, or rather lack of it. With the Bash guard weighing 83g and the boomerang and roller weighing 72g it’s right on the money weight wise. The device has a total system weight with all hardware of 163g. It’s definitely not going to hold you back and it was certainly noticeably lighter than the Race Face all mountain guide it replaced(245g). The metal bashring and added top guide pushing the Race Face device behind in the weight stakes. Good Start.


The test model was an ISCG model, so it was lashed to the faithful '08 SX trail for the period of the test. Fitting was easy. No filing, no fiddling and very little issue in lining everything up. No mean feat considering the asymmetric swing arm and large linkage around the bottom bracket on the SX Trail. Instructions were also clear. Top Marks Gamut.

One thing to note was that after fitting I ran the bike through the gears on the work stand and the roller managed to wind itself off. A 2 minute refit with some blue loctite on the grub screw and she was good. Two days later I received an unsolicited email from Gamut telling me to add loctite to the small grubscrew before fitting, so they clearly knew that they had the issue and hopefully have addressed it.

Riding impressions-

In the 6 months since this device has been fitted it has performed almost faultlessly. One generic problem with all dual devices is the lack of chain retention around the front mech. This can result in any slack in the chain being passed through the mech cage and allow the chain to fall off the large chain ring on the granny ring. This usually happens on big bottom outs when rear wheel travel is at its greatest creating chain slack. The Race Face device did this a lot. The Gamut device has done it twice in 6 months and both after big compressions. It definitely feels more secure. The chain has never once come off to the point where it was jammed or I was unable to pedal. On the two occasions where it did fall, a quick push of the shifter was all that was required to get her in place again.

The chain device is quiet in operation; the nylon roller makes no sound and does not feel like it is dragging the chain at all. The device has been subjected to the liberal use of the dirtworker and the roller is still running sweet. Top marks for that!

Finally, the polycarbonate bash ring still looks good after 6 months of abuse which cannot be bad at all. I also found the glossy finish helps the device to shed mud quickly.

Summary-

There are a few things to put you off fitting a chain device to a bike with more than one chainring. Weight, noise and mud clearance all cause problems as well as the challenges of running one with a front mech. The Gamut faces these problems and delivers. At £99.99 it is certainly not cheap, but it is of good quality and performs. The device comes highly recommended, no ifs, no buts. In fact it performs that well that I think I’m going to order a bottom bracket mounted version to slap on my more XC orientated Heckler!

-Chris



Stay Unclipped!

Si Paton..

Descent-Gear.com
2010 Fox/Monster Energy Beanies Instock 24.99 Posted


27 Comments

  • 4 0
 "This can result in any slack in the chain being passed through the mech cage and allow the chain to fall off the large chain ring on the granny ring. "

Never had this happen on my e.13 drs mounted on 3 different suspension designs...seems like this is a user setup error with the front der.
  • 5 0
 does the chainring come with the cart?
  • 14 1
 screw the cart, I want the hot fairy chick at the end!
  • 3 0
 LEGIT
  • 2 5
 Maybe it's just me, But I almost never have a chain jump off if I'm running a front derailer...it works as a chain guide. Cool idea though, maybe some riders will need it.
  • 1 0
 either that or its just to add a bit of tention...? lol
  • 6 0
 buy me a pony.....
  • 1 0
 I've had this guide for over three months on my 2010 enduro. On the whole, it works amazingly well. BUT I broke the bash last week and have bent the boomerang a few times. The roller wheel has also taken a beating. Has anyone else experienced these kinds of problems?
  • 1 0
 I've got the 2010 enduro as well, mine has never needed any attention at all but saying that the only thing I seem be bash it on are logs and they're pretty soft.
  • 1 0
 Done a downhill race recently and after a few offs I managed to bend the boomerang. Didn't no when it happened but I was having a look after the race and the chain was on the wrong side of the roller.
  • 2 0
 I like mine just fine, but day two and the backwheel slid off a log ride and bent mine all to hell. I bent it back and it is good enough, but lite weight comes at a durability price.
  • 6 1
 HammerSchmidt...
  • 1 1
 Amen to that.
  • 1 1
 touché
  • 3 1
 Hammerschmidt is ridiculously heavy, requires ISCG mounts, only allows two gear ratios, and doesn't work well with all suspension designs. Not to mention that it's quite expensive as well.
  • 1 1
 I would still like to try it. I like the notion that you dont have to be pedaling to shift it. I also like the idea that the chain cant derail. If you have NEVER had an issue dual ring, you arent riding rocks like we have in New England. Looks like you ride a single up front though- from what I can tell. Personally, Ill prob stick with a single 32t up front with an LG-1 guide vs. a hammerschmidt for the reasons you mentioned.
  • 1 0
 I run a 22/36 double with a Blackspire Stinger and E.13 Turbocharger bash guard, actually.
  • 1 2
 Never had this happen on my e.13 drs mounted on 3 different suspension designs...seems like this is a user setup error with the front der.

I've owned 3 different E13 DRS on 3 different bikes and they have all had this issue - the worst was a trip to Whistler in 2007 where it dumped the chain 3 times, 1 of these was jammed so bad I had to remove the cranks at the bottom of the bike park to get it cleared

I'm a pro bike mechanic who installs alot of chain devices both single and dual ring, before you blame bad setup...
  • 3 0
 Well I'm a pro mechanic as well and I can say that if the cable tension is correct on your front derailleur then this will not happen, at least it never did with my E.13 DRS chain guides. I recommend running a front derailleur that is designed specifically for a dual ring setup, like the Shimano SLX M665/M667 as it has a shorter cage that is beneficial to the chain retaining qualities of a chain guide.
  • 2 1
 This is not true. While you are correct that proper set-up is key to reducing this issue, it is ALWAYS possible with a dual ring set-up. i.e., pedaling through a really rocky section at high speed where the chain is flapping all over, the chain can get sucked, doesnt matter how well the mech is set-up.
  • 2 0
 Hmmm, interesting conversation. I'm no mechanic, but I can say that I've got an e.13DRS mounted to a 2006 Giant Faith with a Saint derailleur, and in 4 years the chain has never dropped once. And since this is a DH bike, it has definitely seen more than it's fair share of full-compression hits and g-outs. The only issue I ever had with the e.13 DRS was keeping the bearing in the roller properly greased and rolling freely.
  • 1 3
 maybe on a sus bike its different .. but on a hrdtail i had the same problem..
solution.. become a real man and ride single ring Wink
  • 1 2
 I'm no engineer, but I know I could feel some rolling resistance from my DRS when climbing. How 'bout someone designing a spring loaded roller that won't interfere with the chainline if not in use? For the climb, you could tuck the roller out of the way and run a traditional set-up with no resistance. At the top, slip the chain back over the roller & enjoy the ride.
  • 2 0
 Wow! A £99.99 knock off of a £24.99 Blackspire Stinger which performs better and weighs less!
  • 2 0
 Get a BlackSpire Stinger and save a boatload of cash.
  • 1 0
 I use a Stinger with an E.13 Turbocharger on my Nomad C and it works great.
  • 2 1
 screw the fairys and the cart ill take the whole thing lol

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