Ibis 741.

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SM_Ibis-01956

Width (internal): 35mms
Weight (pair): 1,660g
Available: 27.5 x 41mm, 29 x 41mm

Ibis is proudly surfing the fine line between ‘more’ and ‘too much’ with this monster 41mm wide (external) rim. It comes in both 27in and 29in diameters and is truly impressive to behold.

Ibis has been developing this rim profile for a while and has also been talking to tyre companies to see what tyre designs are in the pipeline. This is very important here because of the dramatic effect that such a wide rim can have on tyre profiles. Ibis suggests that there are many tyres that work well on this jumbo profile, and that it can turn a 2.35in tyre into an effective 2.5in monster, while still clearing forks and chainstays. It also allows a lower pressure than before, due to a greater air volume and wider profile.

The rims are a big ‘D’ shape, tautly laced to nondescript, but capable-looking hubs. The rear hub works with Shimano ten (and 11) speed and there’s an XD driver available for 1×11 SRAM fans.

I’ve tried a number of different 27.5in tyres on the 741s, with widely differing results. Some tyres, like Schwalbe’s Magic Mary or the Maxxis Minion, naturally expand their toothy profiles perfectly into knob-filled jumbo-ness. Other tyres, like the Conti Trail King 2.2, turn into sausages of delicate-looking sidewall, with a laughably narrow mohican of tread at the top.

Just about all of the tyres I tried successfully mounted tubeless with only a large-volume track pump. I was able to run tyres at some silly-low pressures without many incidents. On smoother trails, 15psi was possible and I regularly ran them tubeless around the 20psi mark. The amount of grip this gives you is impressive, addictive and very easy to take for granted. There were a few pinch-flats that wouldn’t seal with sealant, but that was when exploring the lower pressure limits. After six months, the hookless beads and rim surfaces don’t look to have suffered at all.

The 741s (and by inference, the 941s) are fantastic wheels that’ll change how you view tyres, pressures and grip. However, you must make sure you have a tyre that can expand to fit or you’ll end up with vulnerable sidewall exposed or a concave tread. With the right tyres, though, they’re unbeatable.

 

Review Info

Brand:Ibis
Product:741
From: 2Pure, 2pure.co.uk
Price:£1,299.00 (pair)
Tested:by Chipps. for

Chipps

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 (0)

    Any pics showing the tyres on? especially interested in how the M’Marys fit on a wide platform… ta

    I have just that pairing, Scribbler, I’ll try to get you a shot tomorrow

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