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Sonder Frontier Quick, lightweight 29er modern mountain bike, a genuine multi-activity hardtail. Fast and fun without any fuss

Quick, lightweight 29er modern mountain bike, a genuine multi-activity hardtail. Fast and fun without any fuss. Set it up for XC race speed and a trail centre slayer or set it up for all-day comfort loaded with bags and ride rugged country, bothy trips to Cape Wrath and beyond.

Sonder Frontier SX Eagle Rigid Rumpus

Quick, lightweight 650b+ modern mountain bike with SRAM SX 1 x 12 groupset, Rigid fork and Love Mud Rumpus wheelset.

£849.00

Sonder Frontier SX Eagle Rigid Hobo

Quick, lightweight 29er modern mountain bike with SRAM SX 1 x 12 groupset, Rigid fork and Love Mud Hobo wheelset.

£849.00

Sonder Frontier SX Eagle Recon Rumpus

Quick, lightweight 650b+ modern mountain bike with SRAM SX 1 x 12 groupset, Recon fork and Love Mud Rumpus wheelset.

£999.00

Sonder Frontier SX Eagle Recon Hobo

Quick, lightweight 29er modern mountain bike with SRAM SX 1 x 12 groupset, Recon fork and Love Mud Hobo wheelset.

£999.00

Sonder Frontier Frame And Fork

Alloy frame and fork to build up your own 29er or 650b+ mountain biking, trail munching dream machine

£299.00

Sonder Frontier Frame Only

Lightweight alloy hardtail mountain bike frame to build your own 29er or 650b+ bike from trail centre to wild and remote landscapes.

£249.00

Hardtail trail centre mountain bike compatible with 27.5+ or 29 inch wheels. Its beauty is in its simplicity, but don’t confuse simple with basic. Clean lines, internal routing make Frontier an exceptional bike.

Frontier is our versatile alloy all-rounder - ride it hard around the trail centre, load it up and sneak off for a midweek bikepacking trip through mid-Wales, pocket your passport and continue much further afield.

The geometry is relaxed for long day comfort but it’s no slouch. The 6061 aluminium frame provides a durable, low maintenance and stiff chassis giving a responsive kick as you demand power when the slope steepens or enjoy feedback and precision through the corners.

Frontier can be tailored to ride how you want it to ride. The geometry and head angle allows capacity to take a 100mm fork or ride fully rigid. So you can have it set up for XC race speed or all-day comfort and put in the miles. Big tyre clearance gives you the choice of 27.5+ or 29in wheelsets. Bolt Through Boost 148mm rear spacing provides the benefit of stronger, stiffer and more efficient wheels.

Optimised for 1x drivetrains, Frontier is available in SX Eagle builds with rigid or 100mm suspension forks.

Frontier excels both loaded and unloaded, absorbing every surface you ride - you decide how you want to pack for your adventure. With a triple bottle cage mount for versatility and multiple boss mounts on the fork Frontier is an adaptable off-road explorer. Fast and stable for trail centre or big mountain days and responsive when loaded up in the modern lightweight bikepacking style of travel.

Wherever you are in the world - squeezing in an after work loop or halfway through an adventure of a lifetime; Frontier eats up long-distance trails with style and comfort with the shameless enthusiasm of a trail centre hardtail.

Internal Cable Routing

Clean lines and tidy cables thanks to internal downtube routing. Frontier also incorporates routing for a dropper seat post.

Wide Tyre Clearance

Extra width between the chainstays gives you the choice of running 27.5+ tyres up to 3 inches or 29 inch tyres up to 2.5 inches.

Boost Axle Width

The Frontier frame is designed around bolt through Boost 148mm rear spacing providing the benefit of stronger, stiffer and more efficient wheels. Seatstay mounted disc brake for clean lines and damage protection.

Triple Bottle Cage Mounts

Fit 2 bottles in their standard location or run your downtube bottle cage a little lower to clear a bikepacking frame bag. Plus there’s an extra bottle cage mount under the downtube.

Pannier Rack Mount

​Seat clamp mounted pannier attachment points make fitting a rack easier and keep pannier rack rails free from twisting and warping.

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Frame spec

Frame Weight (kg): S: 1.84; M: 1.9; L: 1.98; XL: 2.03
Rigid Fork Weight - uncut (kg): 1.0
6061 Aluminium frame
Optimised for rigid or 100mm suspension forks
Internal cable routing through downtube
Bolt Through Boost 148mm rear spacing for wheel strength and optimal chainline
Fork built around Bolt Through Boost 110mm spacing
Threaded 73mm BSA BB shell for no-creak assembly
Chainstay mounted disc brake for clean lines and damage protection
Triple bottle cage mount on downtube
Use a seat clamp with integrated mounts for pannier rack compatibility
Clearance for 3 inch 650b+ or 2.5 inch 29er tyres
Reverb Stealth port
EN 14766 compliant

Sizing

It is important to get the right size bike, if the bike fits you well it will be faster, more comfortable and easier to handle. Generally we recommend:

Small
Riders between 5ft 2in and 5ft 7in
Medium
Riders between 5ft 6in and 5ft 10in
Large
Riders between 5ft 9in and 6ft 2in
X-Large
Riders 6ft 2in and over
Size Small Medium Large X-Large
ST - Seat tube 380 430 480 520
TT - Top tube 566 602 622 647
HT - Head tube 110 130 130 150
HA - Head angle 68 68 68 68
SA - Seat angle 73 73 73 73
CS - Chainstay 445 445 445 445
BB - BB drop 50 50 50 50
FO - Fork offset 51 51 51 51
WB - Wheelbase 1089 1127 1147 1174.5
SO - Stand over 764 793 825 853
RE - Reach 390 420 440 460
SK - Stack 566 580 594 613

Custom Options

We spec Frontier with pure SX and take pride in offering SRAM just as they designed and tested their componentry to work.

Swapouts and Upgrades

You can interchange Love Mud components on this build at no additional cost. So if you want a different length of stem, a particular saddle or bar then let us know in the notes section in the checkout and we'll get in touch. We also hold big stocks of SRAM, Rockshox, WTB and regular build with Shimano, Hope, Cane Creek. We'll build your Sonder with any part that suits your needs. Give us a call, with the same experienced mechanic helping throughout your build you know who to call if there's anything you want to know.

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Faqs

Support

Alpine Bond Warranty

We offer a 10 year guarantee on both our handmade titanium and Reynolds steel frames. Our hand welded 6061-T6 alloy triple butted frames and carbon frames come with a 5 year manufacturing defect warranty. All our bikes are built, checked and signed off by Cytech trained mechanics before being despatched to you in a custom-made bike box.

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