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Lark wheelsets – Light or Strong?

The Lark series are our high performance aluminium rim-brake road wheels which come in two versions – Lark Light and Lark Strong, and we are often asked how to choose between the two options. The Light are as the name suggests aimed at being the fastest possible while the Strong are built to maximise durability and strength, but there is a lot of cross-over between the two so let’s have a look at them in more detail. Either wheelset can also be used off-road on cyclocross or gravel bikes.

All Lark wheelsets use the same rim which we call the Lark20. This is a very strong aluminium rim with a 20mm internal width and a wide, smooth machined braking surface. The stiffness of the rim means it stays perfectly straight even at high spoke tension and low spoke count, and it’s strong enough for heavy riders.

We build the standard and light wheelsets with different hubs. The Strong hubs have larger bearings which improves durability, especially for wheels used regularly in harsh wintry conditions but are heavier at 301g/pair compared to 258g/pair for the Light hubs. There is also a version of the Lark Light which uses straight-pull hubs (designed to use spokes without a bend at the head), which are between the Light and Strong hubs in weight.

The Light wheels use less spokes to save weight – 20 in the front wheel and 24 in the rear,  while the Strong wheelsets use between 24 and 32 spokes to maximise strength. The Light wheels use a 2:1 spoke lacing pattern on the rear wheel which gives the 24-spoke wheel similar strength and stiffness to a 28 or 32 spoke wheel. All Lark wheelsets are available with an optional upgrade to CX-Ray bladed spokes which save a little weight and a slightly more aerodynamic but don’t make any difference to the wheel strength.

So, armed with that information, how to choose?

Wheel weight – are you looking for the lightest possible wheels? If so then of course you should be looking at the Lark Lights.

Rider weight – we have a rough maximum recommended rider weight of 100kg for the Lark Light wheels. Riders around the 100kg mark should consider the straight-pull version with its slightly larger bearings and marginally higher wheel stiffness from the straight-pull spokes. Much over 100kg we recommend the Lark strong wheelset.

Bearing durability – are these being used for commuting or for heavy training miles through bad weather? If so then the larger bearings of the Strong wheelset will be a good option. For most normal riding, the Light wheelsets are plenty durable enough.

Aesthetics – the straight-pull Lark wheelset is a popular choice due to the sleek looks of the hubs, even though it’s not the lightest option.

If you still can’t decide…. get in touch with any questions through our contact form or add a comment below, and we’ll help you decide.

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Review – IRC’s Formula Pro RBCC tyres

Even though we’ve been dedicated to tubeless tyres since the beginning, we’ve always struggled to offer much in the way of choice when it comes to tubeless compatible road tyres. 10 years ago the Hutchinson Fusion was the only option, and it was a pretty good tyre for the time, maybe a bit narrow and slipped easily on steep climbs but it rolled nicely and was very puncture resistant compared to an inner tube. Then the Schwalbe Pro came along; wider, faster rolling than the Fusion, and lighter too. The “Pro” was followed a couple of years later by the “Pro One” which was more of the same, only better (lighter, wider, faster), so it’s what we’ve been recommending with our wheels ever since.

It’s not for a lack of trying that we haven’t been able to offer any other options, we have looked around but there just aren’t many excellent road tubeless tyres available from the usual brands. Continental have only just brought out their first, the GP5000-TL, but we haven’t had a chance to try it yet.  We tried the Maxxis Padrone TR once the price was reduced from the original comical £200 each, but apart from being impossibly hard to inflate they were energy-sapping, narrow, and turned me into a nervous wreck going around corners.

So until now it’s been the Pro One we offered with our wheels, but they are not perfect. Grip in the dry is excellent, but grip in the wet is merely reasonable as I have found out to my cost a couple of times and picked up the scars to prove it. They come up large which is good for cushioning and resistance against impact punctures, but they do balloon out a little bit even on wide road rims giving uncertain handling under hard cornering and a less than ideal shape for aerodynamics and stability in side winds. They also have a tendency to wear to a squared-off profile after a couple of thousand miles (or less if you skid a lot).

Recently though we have been introduced to the IRC Formula range of tyres, and more specifically the RBCC model. This is the high performance model (although there is a “light” version too which saves a few grams) optimised for low rolling resistance and high grip in the wet through the power of…. Rice Bran. RBCC stands for Rice Bran Ceramic Compound, and of course they have a lot of rice in Japan where these tyres are made, but even so it must still have taken a leap of imagination to think about mixing it into tyres. The rice husks are all turned into (apparently) a ceramic material and blended in with the rubber to create a compound which, IRC claim, gets grippier in the wet but rolls well in the dry. In fact, the way they write about it makes the RBCC sound like a miracle material:

“Rice bran (or the outer husk of an individual rice grain) is ground to a fine powder, mixed with a thermosetting resin, and super-heated. When cooled, the block is pulverized to create millions of porous, ball-shaped structures with semi-rigid fingers extending in all directions. These Rice Bran Ceramic ‘balls’ are then kneaded with the rubber and moulded into tires. The spikes which extend from the RBC reach out and grab the uneven road surface for increased traction while the pores will wick water from the road surface to create a larger tire-to-road contact patch.”

Ingenious, but you can probably see why I was sceptical. Luckily, Malcolm from Velo Distribution, the UK distributor, could see I wasn’t convinced and gave me a pair to try out….

First impressions
The tyres look and feel really nice even before you unwrap them. The rubber is tactile and supple, and it forms a tread across the entire surface from bead to bead unlike, for example, the Pro One which just has tread on the top of the tyre. IRC claim this is for puncture resistance and I could see it working, because I have had small slices to the sidewall threads of other tyres which don’t seal easily. Tread is a light chevron file pattern in rows which alternate in direction across the rubber.

Tread pattern on IRC Formula RBCC tyre

Fitting & inflating
Two conflicting requirements here, the tyre needs to be loose enough to fit on the rim, but tight enough that it inflates easily; a loose, baggy tubeless tyre is hard to get seated, and can lead to tantrums after 30 minutes of failing to inflate. I first tried fitting these to our Lark20 Light wheels which are my everyday runaround set, and the IRCs fitted easily enough with a strong thumb press to get the last bit of bead fitted, no tyre levers needed but they were slightly tighter than the Schwalbe Pro Ones. Inflating was easy and immediate, no fiddling, just pump straight up. After a few months of testing these tyres I fitted them to another wheel and the bead seemed to have stretched very slighty making it easy to fit to the rim, but harder to inflate.

The IRCs measured very close to their nominal size, 25.5mm in fact on the Lark20 wheels. This is much smaller than the Schwalbes, with the Pro Ones 25c measuring a whopping 28.6mm on the same rim. In terms of tyre height (measured from rim edge to top of tyre), the IRCs at 22.2mm were again dwarfed by the Pro Ones at 25.5mm. The IRCs measure almost exactly the same outer width as the rim on these wheels so there is a nice, very smooth transition from tyre to rim – important for aero efficiency and handling in side winds.

The ride

With the tyre being so much smaller than the Pro One, I pumped it up to a good 90psi (more than my usual 75-80) and prepared to get my teeth rattled. Except that didn’t happen. The first and most obvious thing I noticed about these tyres was an unexpectedly smooth ride, they take the edges off any sharp bumps in the road. For such a comfortable tyre it seems very fast too – it’s hard to say without a side by side comparison (something for a future blog post) but it seems to roll as fast as any tyre I’ve tried.

Going in a straight line is all very well but sooner or later you have to make a turn, and cornering on these tyres is a lot of fun. The smooth rounded profile means there’s no sudden transition midway through a turn and maybe it’s the rice bran doing the work, but I have never felt I was going to run out of grip on these tyres. Even on rough surfaces these tyres stay stuck down nicely.

In rain there is certainly more grip than with other tyres. Locking up the rear wheel doesn’t lead to an uncontrollable slide – you can feel (and hear) the fine tread trying to grip and it comes back under control much faster than, say, the Pro One.

The one downside I noticed with the relatively small casing compared to the Pro One tyres is that it’s much easier to bottom out the tyre and impact the rim at lower pressures. Running at 60 psi I felt occasional clangs through potholes or going up lowered curbs at speed. But there has been no damage to the tyre or rim from this. I did pick up one puncture from a piece of metal which cut into the tyre – the hole sealed once pressure dropped to 40psi or so, and I patched it from the in

In conclusion
These are great tyres and I highly recommend them. They feel fast and improved the ride of my bike both from the smooth ride and more cornering grip in the rain, and they haven’t shown any signs of wear in the 3 months or so I have been using them. We will continue to offer other road tubeless tyres with our wheels, but these IRC Formula RBCC are now top of our list of recommended tyres.

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Our lightest road-disk wheels

Map straight-pull hubs with 2 cross lacing

One question we are frequently asked on email is what is your lightest road-disk wheelset. It may be hard to pick them out from our wheels as we offer so many options but they are there if you know what to look for.

Map wheelset built with 6-bolt straight-pull hubs and Sapim D-Light spokes

Map wheelset – aluminium rims with Centre-Lock straight-pull 24 hole hubs, CX-Ray spokes and aluminium nipples  1447g / £460

All the lightest options in our Map wheel build as above with the lowest weight of 1447g. If you want to change the build spec. you can, the links at the bottom take you to pre-configured wheels. The Map rims are used throughout these builds and weigh 440-450g each. They are stiff and tough in all hole counts, and suitable for all-round use.

Going for J-Bend hubs & spokes instead of straight-pull would add 43g with the centre-lock hubs. We’ve weighed these with thru axles and a Shimano freehub. quick release axles and end-caps weigh more but XD freehubs will reduce the weight by 15g. Brass spoke nipples add 31g over aluminium nipples for a build with a total of 48 spokes. We use quality Sapim aluminum nipples and don’t have any problems with them seizing, certainly no more than for brass spoke nipples. Upgrading to Sapim CX-Ray bladed spokes from the already strong and light Sapim D-Light are the greatest cost for the least weight gain at 25g per wheelset offer an aero look and small aero advantage. Cost is an extra £70 per wheelset.

link to Map wheels with D-Light spokes at £390 (this includes orange stickers, black nipples and our choice of 15mm/142mm axles so please change these.)

link to Map wheels with CX-Ray spokes at £459.60 (this includes orange stickers, black nipples and our choice of 15mm/142mm axles so please change these.)

Map SL alu wheelset 1360g – £390

Similar to the Map wheelset above but using our Map SL rims with 21mm internal width. These are our lightest aluminium rims at 395g but they come with a recommended weight limit of 85kg but you can use this for cross-country or road / gravel bike in 650b or 700c.

Buy them here in straight-pull centerlock version for £390

Traildog XC alu wheelset 1427g

Similar to the Map wheelset above but using our Traildog alu XC25 rims with 25mm internal width so you can use this for cross-country or road / gravel bike in 650b or 700c. All parts, including the rims are the same weight as the Map wheelset in 700c/29er while the 650b rim comes in at 410g so saves 60g per wheelset making it a good option for running wide (especially 38mm or larger) tyres on.

Gecko carbon – from 1267g in 700c

The Gecko carbon wheelset uses our 360g, 21mm wide rims to make it one of our lightest wheelsets in any category at just 1267g for the straight-pull, centerlock version which is our most popular. These wheels are designed as a gravel wheelset but are equally at home on the road with 25mm or larger tyres. The only thing to bear in mind is the maximum tyre pressure of 80psi for this wheelset due to the hookless bead design of the rim.

£850 / 1247g


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Ex-test & sample wheel sale

Link to sale wheels category

e-mail to arrange payment or if you have further questions.

Traildog carbon 27.5″ wheelset £640
Carbon 32 hole rims and Boost 6-bolt front and rear hubs, Sapim D-Light spokes, these wheels are used and have been a test set. Black gloss vinyl decals.
was £790 now £640

Industry Nine Classic Fat hubs built onto WTB Asym i35 rims 27.5″  £450
Orange 6-bolt 32 hole FAT 135 /170 hubs, built onto WTB Asym i35 rims in 26″. Used condition.