All-new Lauf Seigla gravel bike dramatically boosts compliance & tire size

The new Lauf Seigla takes everything that was good about the True Grit gravel bike and makes it bigger and better. With improved frame compliance, massive 29×2.25″ (700×57!!!) tire clearance, and arguably better looks, it’s a winner out of the gate.

And, despite the huge new max tire compatibility, they were able to maintain the same geometry, with tight chainstays, without going to extreme tube shaping. The new Seigla, which is simply Icelanding for “true grit” looks to be a worthy successor to their original gravel bike…

new lauf grit suspension gravel bike fork with leaf springs and big tire clearance

But it’s not just the frame that’s new. The heart of Lauf’s bike has always been their leaf spring fork. Offering just 30mm of undamped, friction-free travel, it’s about 600g lighter than the lightest new telescoping gravel suspension forks.

If you’ve never ridden one, just know this: You’re only likely using 15-20mm of the travel during normal riding. And because there’s no friction from seals and bushings, it can react immediately to the most minute of “impacts”, effectively killing vibrations and smoothing the gravelly gravel out of gravel roads. Washboards nearly disappear. And no, it doesn’t bob about awkwardly sans damping.

new lauf grit suspension gravel bike fork with leaf springs and big tire clearance

Now, it’s even better. The carbon-and-S2 fiber leaf springs carry over unchanged. But, they’ve finally switched from a 15mm thru axle to a 12mm thru axle. In the early days of gravel, many riders were simply using lightweight 29er XC wheels (gratefully being able to repurpose their non-Boost MTB wheels), so 15mm axles worked.

Now, with a wide array of proper gravel wheels that are only offered with 12mm thru axle compatibility, Lauf wanted to make sure you could use any modern wheelset on their bikes. They stuck with 12×100, too, with no plans to go to “Road Boost“.

You’ll still need to run a 180mm rotor, though, as their design needs the extra space for the axle carrier.

lauf siegla grit suspension fork for gravel bikes shown at the crown with big tire clearance

They also opened up tire clearance to match the frame’s max tire size of 29×2.25″, which is what’s shown directly above…and you can see how much room there is around the tire.

This update did require a slightly taller axle to crown measurement, which they made up for by making the crown itself slightly shorter and tweaking the head tube height and design. The end result is just a 3mm total increase in stack height.

And a fork that weighs exactly the same as the prior model despite being stiffer. The “dropouts” are lighter than before thanks to new, lighter internal cores, which offsets the weight gained at the crown…which also means less unsprung mass for even better performance.

Lauf Seigla gravel bike closeup details of the head tube

In fact, the geometry is virtually identical to the True Grit. Lauf says they (and their customers) really liked the way the True Grit handled, so the didn’t want to mess with that.

Lauf Seigla gravel bike closeup details of the downtube

But they did reshape the tubes to make it sleeker and stiffer. A deeper headtube and more triangular downtube add torsional stiffness…

Lauf Seigla gravel bike closeup details of the bottom bracket

..while a bolder bottom bracket shell maximizes power transfer. And this is where it starts to get really interesting. The chainstays are very thin looking from the top down, going to a solid carbon section on the driveside to get as thin as possible without giving up any strength or stiffness.

The BB section itself is wider than normal, using a 73mm threaded shell that relies on “custom” 73mm DUB spindles from SRAM. Lauf says they’re the first bike to get SRAM’s road cranks with a 73mm wide spindle, which Lauf requested, but that they’re sure other brands will latch onto this width…

…because it maintains the narrow Q-factor of road cranks while allowing for a wider stance to improve tire clearance. On this frame, the overall design means it’s limited to 1x chainring setups and (for now anyway) SRAM cranks, which is why you’ll only see SRAM Rival, Force, and Red builds. They’ll also only be offering AXS wireless builds, too, which brings up another interesting design consideration:

Lauf Seigla gravel bike closeup details of the seatstays and seat tube

It’s not technically compatible with dropper seatposts, unless:

  1. You add the Rockshox Reverb XPLOR AXS wireless dropper, which would be easy since all of the builds already have the AXS shifter paddles to operate it, or…
  2. You drill a small hole just past the internal cable tunnel at the headtube port for a rear shift cable. It’s non-structural, and since the bikes will mostly (entirely, at first) be sold with with wireless groups, that port is open.

While Lauf’s president, Benedikt, says it can be done safely, it may void the warranty, and you’ll want to be suuuuuper careful not to drill too far and have it pop out the other side of the frame. We talk about this in our podcast interview with him. Subscribe to the Bikerumor Podcast wherever you listen to hear it and more about the new Seigla.

Benedikt says there was definitely some dropper post interest from within the ranks, but in the end, the bike is designed as a race bike, and the decision was made to keep it as simple as possible.

Lauf Seigla gravel bike closeup details of the rear tire clearance at the seatstays

However, they also wanted it to be as capable as possible, hence the added compliance from dropped, flatter seatstays and the massive tire clearance. Combined, they should make the bike able to handle the gnarliest terrain, while letting you dial back the tires to suit less aggressive courses.

Lauf Seigla gravel bike closeup details of the seatstays and seat tube

The added rear compliance comes from several design features, and they say it’s as compliant or more so than fancier designs with pivots (think Trek Domane or Cannondale Topstone).

First, the top tube flattens out as it hits the seat tube, making that junction more flexible. Second, the seatstays are flatter, but they also hit the seat tube much lower. Combined, these two spots acts as “virtual” pivot points.

Third, the seat tube itself is angled rearward more – it has a slacker actual angle, its centerline meeting the downtube slightly in front of the bottom bracket. This lets the rider’s weight “flex” it more easily, than if it were more vertical, all of which is accentuated by the other design features.

lauf seigla geometry chart

Another key point about the frame: It uses standard carbon fibers, not high modulus. Benedikt says that while Hi Mod fibers are stiffer and lighter, and even resist crack propagation better, they’re not as tough or durable.

They’re often used for bikes that need to be as light as possible yet still past ISO testing, but don’t offer the impact resistance and engineered flex that Lauf needed for a bike like this. But, they say their careful layup and good manufacturing process still let them make the bikes light. Here’s the full builds with claimed weights:

lauf Seigla gravel bike build specs, prices and claimed weights

Note that they’ll sell the bike with both their Grit suspension fork and their JAF (Just A Fork) rigid fork for those wanting more of a long-distance road bike. Claimed frame and fork weights are:

  • Medium Seigla frame, ready to paint, without parts = 1030g
  • Medium Seigla frame, Obsidian Black, with seat-clamp, thick rubber chainstay protector and all bottle cage screws = 1163g
  • Grit 3rd gen, ready to paint, without axle, full length uncut steerer = 827g
  • Grit 3rd gen, Obsidian Black, without axle, full length uncut steerer = 857g
  • JAF 2nd gen, ready to paint, without axle, full length uncut steerer = 412g
  • JAF 2nd gen, Obsidian Black, without axle, full length uncut steerer = 428g

Bikes will get a rolling change to 45mm tires in the future, and the Weekend Warrior builds will switch to a 40T chainring as supply chain issues clear up and more parts become available. At launch, the Race and Ultimate builds are immediately available, and the Weekend Warrior builds should follow about a month later.

Color options are Obsidian Black, Glacial White, Moss Campion, and Silfra Blue. Stay tuned for a full ride review.

LaufCycling.com

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Gordo
Gordo
7 months ago

I call shenanigans on the fork weight claim of 600 g lighter than a telescopic. The new Fox and RS gravel forks are 1227-ish and the Lauf is 857. That’s 370 g, not 600. It’s still a lot lighter, but it’s half a pound more than they imply…

George
George
7 months ago

They lost me at 1x only… which is a shame because otherwise, I’d be pretty interested.

luddite
luddite
7 months ago

Oh good, another BB/crank “standard”. #Facepalm

Glenngineer
Glenngineer
7 months ago
Reply to  luddite

Seriously, I’m also struggling with the road stance claim.. I’m reading it more like Whites solution of road arms on a mountain spindle, so you end up with a tweener. I run wide spindle ISSI pedals on my grx because my hips need a little more stance… But no one needs another ‘standard. ‘

greg
greg
7 months ago
Reply to  luddite

Any idea how one would mount shimano cranks (with a decent size chainring) on this bike? Seems impossible, unless I am missing something?

greg
greg
7 months ago
Reply to  luddite

So anybody know if this is compatible with ANY modern shimano cranksets with decently large chainrings? Seems like none would fit.

Wayne
Wayne
7 months ago
Reply to  greg

Any MTB cranks will fit. It’s just a 73mm BSA BB. You can get 42t chainrings for MTB cranks.

Joel
Joel
7 months ago
Reply to  luddite

It is simply a non-boost mtb crank (6mm offset)

SomeGuy
SomeGuy
7 months ago

Guys, this is just a mountain bike. Save yourself the wait and just get a carbon hardtail frame from about 2012 and mount a drop-bar kit. Same-Same, but with maybe even better tire clearance.

Greg
Greg
7 months ago

“Road Wide” has been on offer from SRAM for years. It predates all of AXS. I don’t understand why Lauf thinks they’re the first.
Using Road Wide on a 73mm shell frame instead of a 68mm frame with extra spacers might be novel, I’m not sure. But there have been several gravel and gravel-ish frames with 73mm shells as well. They typically spec MTB cranks though.
SRAM is not even the only one offering Road Wide. Rotor has also been offering it for at least a couple years.

fin mchugh
fin mchugh
7 months ago

So it’s got huge tyres to cope with more extreme terrain but you have to void your warranty and drill a hole in your new frame if you won’t cough up for an AXS post… I’m out.

Patrick
Patrick
7 months ago
Reply to  fin mchugh

You would be crazy not to cough up for an AXS XPLR post when you already have the AXS shifters though. It works so well and the weight is competitive once you account for a mechanical lever, cabling and the likelihood that an extra AXS battery would be stored somewhere on your bike anyhow.

Wolf
Wolf
7 months ago

It looks intriguing; however, I’m wondering why they decided on an old cyclocross-style BB drop of 65mm. With large tires you will be perched up there. It’s an odd choice for a gravel race bike, where competitors have drops in the mid-70’s.

VazzedUp
VazzedUp
7 months ago

Monster cross is back! Think I’ll stick with my mtb and the True Grit coming to me soon for gravel roads.

jimjam
jimjam
7 months ago

can’t wait to see more and more frame manufacturers sell 73mm bb shells as “road wide” instead of what it’s been known as all along.

Paulet Benoît
Paulet Benoît
4 months ago

Bonjour , pourriez-vous me faire parvenir les renseignements en Français, d’avance merci

Benjamin Villasenor
Benjamin Villasenor
3 months ago

So, how do you purchase the bike.
Where is the price tag. Why is all this info not here. I went through the entire page and nothing. So frustrating

Timmy
Timmy
3 months ago

pricing is in the build specs grid, last 3 lines…given in USD, EUR and GRP’s.

Peter
Peter
1 month ago
Reply to  Timmy

adding the sales tax so buyers can see the REAL price before checkout would be nice.

Anthony Anicete
Anthony Anicete
1 month ago

Lauf siegla vs cannodale topstone lefty?