Sonder Frontier [V1] SX Eagle Rigid Rumpus
Quick, lightweight 650b+ modern mountain bike with SRAM SX 1 x 12 groupset, Rigid fork and Love Mud Rumpus wheelset.
£749.00 Was: £799.00
Available on finance, from per month*
Pictures are for illustration and some components and finishing kit of this build may be different. Please refer to the detailed spec sheet before placing an order.
How To Order
All our bikes are built individually to order. If you want to change any part of the spec to suit your needs then get in touch.
Frontier Frame [V1]
Please allow 20 working days for us to build, check, pack and despatch your Sonder.
Alternative payment options
|Spread the cost of your purchase||show details...|
|Order Administration Fee|
|Deposit to Pay|
|Amount of Credit|
|Total Amount Payable|
|Alpkit Ltd acts as a credit intermediary and offer credit products provided exclusively by Klarna Bank AB (publ). Klarna Bank AB (publ) is Authorised by the Swedish Financial Services Authority (Finansinspektionen) and is subject to limited regulation by the Financial Conduct Authority. Details about the extent of our regulation by the Financial Conduct Authority are available from us on request. Finance is only available to permanent UK residents aged >18, subject to status, terms and conditions apply. Registered office: Sveavägen 46, 111 34 Stockholm, Sweden. Corporation ID number: 556737-0431.|
At a glance
- For searching out technical terrain
- 6061 aluminium frame
- Relaxed riding position for comfort and performance
- Rigid forks
- Hydraulic disk brakes
- QR Boost 141mm rear spacing
- Rear mudguard and pannier rack mounts
- 650b+ and 29” wheel size compatible frame
Frontier is our multi-activity hardtail mountain bike. Ride hard at the trail centre, load it up for a midweek bikepacking trip, pocket your passport and continue around the world. With full rack mounts at the back and multiple boss mounts on the fork, Frontier is an adaptable off-road explorer.
The geometry is for long day comfort but it’s no slouch.
The 6061 aluminium frame provides a durable and stiff chassis giving a responsive kick as you demand power when the slope steepens or enjoy feedback and precision through the corners.
Available as a fully rigid or with 100 mm suspension fork. Set it up for XC race speed or for all day big mile comfort.
Tyre clearance gives you the choice of 27.5+ or 29in wheelsets. QR Boost 141 mm rear spacing provide the benefit of stronger, stiffer and more efficient wheels.
Why SX Eagle?
SRAM Eagle drivetrains are designed, engineered and manufactured to work as complete drivetrain systems. Its 1x drivetrain is built to be lightweight, strong and intuitive, with the gear range to ride on any terrain.
SX Eagle provides the same Eagle performance benefits as NX Eagle, but at a lower price point. The main differences stem from the choice of materials and finish options, but functionally SX is fully compatible with SRAMs Eagle groupset.
The 6061 aluminium tubing is durable, light, low maintenance and stiff.
Internal cable routing
Clean lines and tidy cables thanks to internal 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 2.4 inches.
Boost axle width
The Frontier frame is designed around QR Boost 141 mm rear spacing providing the benefit of stronger, stiffer and more efficient wheels. Seatstay mounted disc brake for clean lines and damage protection.
Responsive when loaded - Frontier is more than happy to shoulder a pannier.
|Frame Weight (kg): S: 1.7; M: 1.8; L: 1.86; XL: 2.0|
|Rigid Fork Weight - uncut (kg): 1.0|
|6061 Aluminium frame|
|Optimised for rigid or 100 mm suspension forks|
|Internal cable routing|
|QR Boost 141 rear spacing for wheel strength and optimal chainline|
|Fork built around QR Boost 110 mm spacing|
|Threaded 73 mm BSA BB shell for no-creak assembly|
|Chainstay mounted disc brake for clean lines and damage protection|
|Adventure cage compatible downtube mount|
|Full rack mounts and multiple boss mounts on rigid fork|
|Clearance for 3 inch 650b+ or 2.5 inch 29er tyres|
|Reverb Stealth port|
|EN 14766 compliant|
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:
- 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 2 and over
|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||435||435||435||435|
|BB - BB drop||50||50||50||50|
|FO - Fork offset||51||51||51||51|
|WB - Wheelbase||1089||1127||1147||1174.5|
|SO - Stand over|
|RE - Reach||390||420||440||460|
|SK - Stack|
|Build||SRAM SX Eagle, 1 x 12 Rigid Rumpus 650+ plus|
|Frame||Sonder Frontier Frame|
|Headset||Love Mud Rumour, Integrated Sealed Bearing, Tapered|
|Seat clamp||Love Mud Vice, 34.9 mm|
|Brake Front||SRAM Level|
|Brake Rear||SRAM Level|
|Rotor Rear||Avid Centreline 160 mm|
|Rotor Front||Avid Centreline 180 mm|
|Rear mech||SRAM SX Eagle Rear Derailleur 1x12 Long Cage|
|Shifter Rear||SRAM SX 12sp|
|Chainset||SRAM SX Chainset Powerspline 32T|
|Bottom Bracket||SRAM Powerspline|
|Cassette||SRAM PG-1210 12sp, 11-50t|
|Stem||Love Mud Piskie, 31.8 mm|
|Seatpost||Love Mud Membar, 31.6 mm|
|Saddle||Love Mud Abode|
|Tape/Grips||Love Mud Clutch|
|Handlebar||Love Mud Aspect Riser, 780 mm|
|Wheels||Love Mud Hobo 29er Wheelset|
|Tyres||WTB Trail Boss 2.4 Comp|
|Tubes||WTB Inner Tube Presta 29|
|Frame||S: 1.7 kg; M: 1.8 kg; L: 1.86 kg; XL: 2 kg|
|Built||12.5 kg; M: 12.7 kg; L: 12.8 kg; XL: 13.3 kg|
|Pedals not included with full builds|
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.
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.