iceBike* – The Gamut P30 chain device

by 7

Gamut has a new ground-up redesign of its P30 chain device and it reckons that it’s going to be a popular with UK riders, mainly due to the lack of bearings in it. The ever cheerful Juan from Gamut gave us the walk-through and it really looks like it’ll be one of those ‘must try, surely it can’t be that simple?’ things.

So far, so normal… So what’s the deal?
The P30 is a ground-up redesign of Gamut’s popular device. It has a new bashguard ring. Refreshingly, it’s not any lighter than the old one, but it is stronger for the same weight. It also now includes alloy inserts so that you can’t crack it by being hamfisted with the Allen key… The top guide had done away with the stabilising bolt and put in a moulded nub instead for weight saving.

Top bolt is supported by the bottom plastic pin.

The clever bit, though is the bottom guide… Normally, this would be a roller running on a cartridge bearing, but after a few wet rides, a bit of jet washing and a lot of being put away damp, these tended to seize up… So, in a great bit of simple-thinking, Gamut have replace all that gubbins with…

Looks like a normal chain guide.

…an O-ring.

No rollers, no jockey wheels. Just an O-ring that the chain runs over.

Simple as that. There’s a thick, nitrile O-ring (similar to what you’d find marking your travel on your fork or rear shock) that the chain sits on. And that’s it! The chain’s pins, rather than plates run on the O-ring, so you only have round pin on rubber, making it pretty smooth running. Water and mud won’t particularly add any more friction and the O-ring tends to ‘creep’ round its mount so that it should wear evenly. When it eventually breaks, for a while you’ll notice a noise, but then you can replace it. A pack of ten O-rings probably won’t cost more than about £4 from a hardware shop.

Break it and... well, it'll be a bit noisy until you put a new one on. That's about it.

Expect to see the pros riding these in April and hopefully in the shops some time this summer. Now why didn’t we think of that?

And an inadvertent benefit? It’s now 100g lighter!


Singletrack Editor

Chipps wasn’t around for the dawn of mountain biking in the UK, but he likes to claim that he arrived in time for second breakfast (about the time he shows up for work, then…) starting in the bike trade in 1990 and becoming a full time mountain bike journalist at the start of 1994. Over the subsequent quarter century, he has seen mountain bike culture flourish and diversify and bike technology go from rigid steel frames to fully suspended carbon fibre (and sometimes back to rigid steel as well.)

His riding style is best described as ‘medium, wheels on the ground, trail riding’ though he’s been spotted doing everything from endurance downhill racing to 24 hour cross country racing. He favours mid-travel trail bikes and claims to be wheel-size, gear, brake and tyre agnostic. In fact, his garage spans most bicycle flavours, taking in steel hardtails, carbon trail bikes, even a mountain bike tandem, along with road, touring and gravel/cyclocross bikes.

While he’s happy to chat about bikes all day, his real interest is in the people and places that bikes can introduce you to and he talks as fondly about the trails he’s ridden and riders he’s met as the bikes that took him there.

Comments (7)

    Any idea on price?
    “No rollers, no jockey wheels. Just an O-ring that the chain runs over”
    I mean, they couldn’t possibly charge anything like nearing £100 for that could they? ..

    I’ll work on the price finding for you.
    There’s no roller, but there’s still the backplate, bash guard and all the machined and moulded bits and pieces. Don’t expect much-cheapness, but you never know…

    That’s clever…

    Existing P30 costs quite a lot- £80 usually. But it’s a very nice bit of kit- quality anodising, light but strong bashring (lightest one I’ve used that was strong enough to do any bashing), lightweight backplate (lots of holes etc). So I’d imagine it’ll be in the same ballpark.

    Will they be doing a version for a double and bash set up without the top guide?

    The ever cheerful Juan

    He He He He

    Refreshingly, It’s not any lighter but it is stronger for the same weight.

    It’s 100 grams lighter


    Looks good though, simple is best!

    robsoctane, I think the bashring is stronger/the same weight, but the chain device itself is 100g lighter?

Leave a Reply