Sonder Frontier NX1 Reba Rumpus 650b+
Quick, lightweight 650b+ modern mountain bike with SRAM NX1 1 x 11 groupset, Reba fork and Love Mud Rumpus wheelset.
List Price: £1299.00
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.
Please allow 10 working days for us to build, check, pack and despatch your Sonder.
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|We act as a credit broker and not a lender and can introduce you to Close Brothers Retail Finance. Terms and Conditions apply. Finance subject to status. Applicants must be 18 or over and resident in the UK. Finance provided by Close Brothers Retail Finance, a trading style of Close Brothers Limited – a subsidiary of Close Brothers Group Plc. Registered Office: 10 Crown Place, London, EC2A 4FT.|
At a glance
- For searching out technical terrain
- 6061 aluminium frame
- Relaxed riding position for comfort and performance
- Rockshox Reba suspension 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.
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|
|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 NX1, 1 x 11|
|Frame||Sonder Frontier Frame|
|Headset||Love Mud Rumour, Integrated Sealed Bearing, Tapered|
|Seat clamp||Love Mud Vice, 34.9 mm|
|Brake Front||SRAM Level 800mm|
|Brake Rear||SRAM Level 1400mm|
|Rotor Rear||Avid Centreline 160 mm|
|Rotor Front||Avid Centreline 180 mm|
|Rear mech||SRAM NX1 Rear Derailleur 1x11 Long Cage|
|Shifter Rear||SRAM NX1 11sp|
|Chainset||SRAM NX1 Chainset 1 x Xsync 32T|
|Bottom Bracket||SRAM GXP|
|Chain||SRAM PC1110 Chain 118 Links|
|Cassette||SRAM PG-1130 11sp|
|Stem||Love Mud Piskie, 31.8 mm|
|Seatpost||Love Mud Membar, 31.6 mm|
|Saddle||Love Mud Abode|
|Tape/Grips||Love Mud Grabby|
|Handlebar||Love Mud Aspect Riser, 780 mm|
|Wheels||Love Mud Rumpus 650b+ Wheelset|
|Tyres||WTB Ranger 2.8 Comp|
|Tubes||WTB Inner Tube Presta 27.5, 2.8-3.00|
|Frame||S: 1.7 kg; M: 1.8 kg; L: 1.86 kg; XL: 2 kg|
|Built||S: TBC; M: 13.3 kg; L: TBC; XL: TBC
Unfortunately we haven't been able to weigh these bikes yet, please bear with us and we'll update this page as soon as we can
|Pedals not included with full builds|
The build kits we use are tried and tested. It's stuff we know just works together. But if you want to change any part of the spec ... no matter how small ... then get in touch. Any change is no problem. Working with you to create dream bikes means we've built some pretty special bikes along the way.
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 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 and we will help spec and build a Sonder. With the same experienced mechanic helping throughout your build you know who to call if there's anything you want to know.
- Can I set up Sonder Frontier to run as a single speed
- What are builds and groupsets?
- When will you get your bike?
- I’m between bike sizes - which size should I choose?
- Bike Frame and Build Weights
- How much does international shipping for Sonder Bikes and Love Mud Wheels cost?
- Common Bike Upgrades: price list
- Why have Alpkit designed their own bikes?
- Try Before You Buy - Sonder Demo and Bike Hire
- Which wheelset for which Sonder Bike?
- Are Sonder available outside the UK?
- Cycle to Work Schemes
Alpine Bond Warranty
Our titanium frames are handmade and come with a 10 year frame warranty. 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.
Used this product?Write a review
Indestructable Adventure Machine
On Friday 25th May 2018 I completed a 26 day mountain bike ride commencing from Dunnet Head, heading across to John o' Groats, meandering down the country across all manner of landscape to Lands End, before then completing my trip at Lizard Point. I covered more than 1200 miles.
I carried out this mammoth undertaking on a Sonder Frontier Recon Rumpus, purchased just a month before leaving after a brief weekend trial in Wales. Clearly it was an extreme product test and it was a choice I did not regret for one second. The bike was a constant pleasure to ride and held up to everything that was thrown at it, including Scottish Highlands, Yorkshire moors and Welsh hills.
It looks a very different beast from when it arrived at my house only a couple of months ago, bearing scars of bike pack straps across the frame and in need of new tyres, but the only things I had to do on route were replace some very worn brake pads and change one inner tube. The slow puncture I picked up on the last two days would wait until I got home.
Sonder have deliverd a durable, comfortable and reliable machine which transported me without issue. Of all the things I had to tackle on my trip I was very thankful a troublesome bike wasn't one of them.
Simply put, I thoroughly recommend this bike.