RockStop Tubeless Insert | Review

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Can’t Stop The Rock. We’ve been warned repeatedly. It’s been received wisdom for decades, but now, thanks to Rockstop, could Apollo 440 be wrong? There’s a chance. The rock might be stoppable.

Rockstop is made by a UK company, based in Cumbria and named Urofoam. They developed it in collaboration with Grizedale Mountain Bike Hire, and unlike most inserts, which are generally forms of EVA foam, it’s made of a polyeurethane elastomer. That gives it a smooth finish, which is good at shedding sealant.

Rockstop Tubeless Insert
Line up the holes with your valve

It’s available in three sizes: 29in, 27.5in, and a wide version of 27.5in for plus tyres. They sent us some 29in and 27.5in ones, and given the difference in material to other inserts, we were certainly curious.


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Review Info

Price:£65 per insert
Tested:by David Hayward for 3 months

David Hayward

Singletrack Contributor

David started mountain biking in the 90’s, by which he means “Ineptly jumping a Saracen Kili Racer off anything available in a nearby industrial estate”. After growing up and living in some extremely flat places, David moved to Yorkshire specifically for the mountain biking. This felt like a horrible mistake at first, because the hills are so steep, but you get used to them pretty quickly.

Previously, David trifled with road and BMX, but mountain bikes always won. He’s most at peace battering down a rough trail, quietly fixing everything that does to a bike, or trying to figure out if that one click of compression damping has made things marginally better or worse. The inept jumping continues to this day.

Comments (12)

    Up there with cushcore ??

    Depends on your priorities. If you mainly want tyre support, nothing really equals Cushcore for that. If it’s rim protection you want though, I’ve found Rockstop, Air Liner and ARD all much tougher.

    I’m finishing up last reviews and there’ll be roundup articles at some point, but for now you can see all the other insert reviews I’ve done here:

    How do inserts affect the “suppleness” (is that even a word?) of a tyre? They may protect the rim, but at what cost? Do they make the tyre more rigid and less comfortable to ride?

    I use the RImpact system, which to be fair has taken a hammering, but I did end up with a pretty big ding in a Halo rim after failing to properly clear a Scottish water bar at the end of a long ride when I was pretty tired!!

    looks good.

    does it offer any dampening?

    vs a heavy tire?

    Really like the look of these, £65 seems steep but OK, go to website, £65 per end errr, nevermind.

    Good old Huck Norris still for me. It’s light so pairs well with a dual ply rear tyre.

    Thought it was £65 a pair which would have been a fair price I reckon will pass and just keep repairing my rims 🙂

    I’m also interested in the damping, I would have liked to see some back to back testing down the same runs using a shockwiz to measure the effect on the bikes suspension

    Yeah, was interested, until I saw the price unfortunately.

    I’ve just ordered some Effetto Tyre Invaders – very similar design but cheaper than that for a pair and a whole lot lighter. Hopefully they’ll provide some decent rim protection.

    SO many inserts out there now. Cush core seem to be the only ones offering some dampening rather than just protection?

    I feel there should be two categories, but cush-core apart, all the reviews seem to suggest that they all generally work. So, why not get the cheapest/lightest?

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