• Calipers must be slim in width. Only TRP Spyke and Spyre and Rever cable actuated will work. Avid BB5/7 and other cable actuated calipers are too wide
• Flat bar and drop-bar brake levers have different pull ratios and require different calipers. For example, TRP makes Spyke for flat bar and Spyre for drop bar. Some lever companies make flat bar levers that work with dropbar calipers and vice-versa
• Some hybrid cable/hydraulic calipers will work
• Most hydraulic calipers will work but be sure to use 5mm hydraulic housing
• Caliper max width: 43mm
• Must be post mount

• cable: TRP Spyke and Spyre, REVER MCX-2
• cable/hydraulic: TRP HY/RD
• hydraulic: Sram, Shimano, Formula, Magura, Hope and others

Standard

Ultralight

• Most MTB cable actuated brake levers will work.
• Avid BB5/7 are popular and work well.
• Flat bar and drop-bar brake levers have different pull ratios and require different calipers. For example, TRP makes Spyke for flat bar and Spyre for drop bar. Some lever companies make flat bar levers that work with dropbar calipers and vice-versa
• Be weary of off-brand levers that are extremely light, they work very poorly and are very flimsy

• cable: Avid BB5/BB7, TRP, Mr Control
• hydraulic: Sram, Shimano, Formula, Magura, Hope and others

Standard

Ultralight

• Crankset is one part that needs special consideration. The right crankarm can interfere with the swingarm when folded, so ask the supplier to send you a fitment chart to be able to check the crankarm distance from frame center (see image below)
  
• Max 30mm spindle diameter (see BB description below for more details)
• Must be 1X single chainring (double or triple chainrings will not work)
• Must have a direct mount chainring so that the chainring bolts do not interfere with the rear tire clearance when folded. Some boost cranks with a traditional spider will also work, but be sure that the spider and chainring bolts do not extend past the chainring backside.
• Max length: Any length but be careful of crankarm clearance at swingarm when folded. Image below shows swingarm when folded. The crankarm must clear the blue tubes.
  

• Most Sram MTB cranks, Most Shimano MTB cranks, Cane Creek eeWings (165mm & 170mm)

Standard

Ultralight

• Must be 1X single chainring (double or triple chainrings will not work)
• Chainring must be Boost spacing (3mm outward offset) for tire clearance when folded
  
• Must be narrow-wide tooth profile otherwise chain may drop when folded
• Must have a direct mount interface to mount to the stock crankset
• Max size will depend on largest rear sprocket on cassette

• Sram, RaceFace, e13, Easton, Wolf Tooth Components, Absolute Black, Garbaruk

Standard

Ultralight

• English/BSA thread (1.37" x 24tpi)
• BB width: 73mm
• Max BB cup outer diameter: 46mm

• Sram GXP & DUB, Cane Creek Hellbender

Standard

Ultralight

• You can upgrade the cassette to any configuration. Everything from a 9 tooth sprocket up to a 51t will work. The limiting factor is the front chainring. Anything above 36t will need a smaller front chainring.

• Shimano, SRAM, Campagnolo and others

Standard

Ultralight

• Any road, MTB and other type derailleur will work, however we recommend Shimano "Shadow" derailleurs because they are low profile and will minimize folded dimensions and also the cable pull clamp will not interfere with the steerer knob when folded.
• Any speed is compatible
• Electronic shifting will work for both Shimano and Sram

• Shimano, SRAM, Campagnolo and others

Standard

Ultralight

• Stem mounting diameter: 31.8mm
• Drop bars will work but will affect the width of the bike when folded

• 580mm is max length to fit upcoming hard case

Standard

• Stem mounting diameter: 31.8mm
• Length: 580mm
• Grip mount diameter: 22mm
• Grip mount length: about 144mm
• Back sweep: 6 deg
• Up sweep: 4 deg
• Rise: 12mm

Ultralight

• 28.6mm steerer diameter
• 31.8mm bar diameter
• A longer stem will affect the folded dimensions slightly.
• It is not recommended to change to a carbon fiber stem as this is a critical component

• Any stem with 28.6mm steerer diameter

Standard

• Steerer diameter: 28.6mm
• Handlebar diameter: 31.8mm
• Length/Reach: 50mm
• Rise: 17 degrees (15.3mm)

Ultralight

• The stock rims are a very durable road/touring rim made from 6061 aluminum with a welded seam (stronger and lighter than pinned)
• The ultralight spec will use Stan's Crest MK3 rims, they are a strong and very lightweight at 300g. This rim can be also run tubeless but only at about 60psi. They are the lightest 24" rim that we could find, even lighter than carbon rims which came in at about 360g.

• Any 507mm (24") rim

Standard

• Diameter: 507mm (known as 24")
• Inner Width: 20mm
• Outer Width: 23.8mm
• Valve: Presta
• Spokes: 28 front wheel / 28 thru-axle / 32 Alfine
• Tubeless: No

Ultralight

• The stock inner tubes are Kenda
• The ultralight spec will use Tubolito

• Any 507-25 to 507-40 (24" x 1-1.5") tube

Standard

• 507-40 (24" x 1.5")

Ultralight

• Many aftermarket hubs will work but be sure to check that the hub manufactuer offers custom end caps to be able to adjust the spacing from the more common 142mm to 135mm. Also be sure to check the end cap diameter is max 21mm left and 19mm right.

Standard

• 135mm width/spacing
• 12mm thru-axle
• 21mm max left side end cap diameter
• 19mm max right side end cap diameter
• Centerlock brake mount
• Shimano driver (Also compatible with: Sram XD & XDR and Shimano MicroSpline)
• 28 points of enagement (POE)
• Sealed bearing (replaceable)

Ultralight

• The front hub is custon to Helix and is manufactured by Formula. It is made by 3D forging and CNC machining.
• There are no aftermarket options for this. The bearings are high quality stainless steel sealed bearings and are an industry standard size and replacements are available from us or any quality bearing supplier.

Standard

• IS 6 bolt brake mount
• Left bearing: SB6805ZZ stainless steel sealed bearing (37mm OD / 25mm ID / 7mm width)
• Right bearing: SB6805ZZ stainless steel sealed bearing (47mm OD / 35mm ID / 7mm width)

Ultralight

• The Shimano Alfine 11 is Shimano's top of the line internal geared hub. It is known to be very reliable and has top performance specs in comparison to the other IGH hubs available.
• Alfine 11 comes in an electronic shifting version as well which is also compatible.
• At the moment, no other hubs are compatible.
• Rohlhoff, Kindernay and NuVinci will not work because they use a dual cable shift mechanism and Helix only supports a single shift cable; also for Rohloff the shift mechanism is on the left side which interferes with folding.

Some notes on the Alfine setup:

• The Alfine 11 SG-S700 has a steel axle with a through hole. The nuts that secure it to the dropouts are further secured with the secondary safety axle and nut assembly. It is critical to reinstall this when removing the wheel for servicing.
• The Alfine 11 axle has been cut at the Helix factory to allow for front wheel clearance when folded.
• Helix ships with an Alfine 11 and is NOT compatible with the Alfine 8 because it doesn't have the through hole in the axle. Our new titanium dropouts will have a serrated nut that will not require the use of the secondary safety axle and will allow the use of Alfine 8 as well.

• Alfine 11 and Alfine 11 Di2 only

Standard

• Gears/speeds: 11
• Gear range: 409%
• Gears ratios: (1) 0.527 (2) 0.681 (3) 0.770 (4) 0.878 (5) 0.995 (6) 1.134 (7) 1.292 (8) 1.462 (9) 1.667 (10) 1.888 (11) 2.153
• Brake mount: Centerlock Disk
• Spoke holes: 32
• 10mm solid axle with M10 x 1.0 thread
• 135mm spacing between dropouts

Ultralight

• The thru-axle is a lightweight design made by Formula. It does not have a quick release mechanism so it is lighter and slimmer.
• All thru-axles with or without a quick release lever will work.

Standard

• 160mm length
• min 16mm / max 20mm thread length
• Thread is M12 x 1.5mm

Ultralight

• Helix ships with Kenda Kwest foldig bead tires. They have low roling resistance are long lasting, durable and puncture resistant.
• There are many aftermarket options available. The main limitations are chainring to frame clearance and swingarm chainstay clearance.

• Kenda Kwest, Kenda Small Block 8 Pro, Donnelly MXP

Standard

• 507mm diameter
• Width: 40mm
• Folding Bead
• Puncture resistant
• Max 100psi

Ultralight

• Many aftermarket rotors will work
• Rotors must be 160mm diameter
• Front rotor is ISO 6 bolt mount
• Rear rotor is Shimano Centerlock and uses an oversized lockring for thru-axle bikes and a regular lockring for Alfine

• Front: 160mm IS 6 bolt
• Rear: 160mm centerlock
• Alfine uses regualr lockring; thru-axle uses oversize lockring

Standard

• 160mm diameter

Ultralight

• Many aftermarket pedals will work
• Wellgo QRD has over 100 different models
• Sram NX crankarms have 9/16" x 20tpi thread for pedals

• Wellgo QRD-I and QRD-II
• MKS
• Suntour folding

Standard

• 9/16" x 20tpi thread left/right

Ultralight

• Many aftermarket saddles will work
• Saddles with carbon rails will need our carbon clamp set which is coming soon
• Seat tube inside diameter is 28.6mm. Only seatposts that are 28.6mm diameter will fit. It is possible to use smaller diameter posts with a shim but it is not recommended.

• All CrMo, Ti and carbon rails saddles
• All 28.6mm diameter seatposts

Standard

• CrMo rails 7mm

Ultralight

• Any Shimano freehub driver compatible cog will work (Hyperglide)

Standard

Ultralight

• Shimano and Sram shifters will work
• Be sure to match cable pull ratios when mixing shifters and derailleurs from different brands

Standard

Ultralight

• Many aftermarket grips will work
• Flatbar diameter at grips: 22mm

Standard

Ultralight

• Many aftermarket cables and housing will work
• For TRP calipers use only compressionelss brake housing not to be confused with low-compression housing (compressionless has straight internal wires while all others have coiled).

• Jagwire LEX-SL
• Shimano doesn't have compressionless

• Jagwire KEB-SL
• Shimano SP41

Standard

Ultralight

• Make sure to match cassette speeds with chain and cassete brand with chain will work best

• Shimano, Sram, TYC, KMC, FSA, YBN and others will work

Standard

Ultralight

• Mudguards will soon be available for your Helix. They will offer full coverage and will not affect the folded dimensions or ability to roll when folded.
• Many seatpost mount rear mudguards will work. There are currently no complete front and rear options available.

• Helix custom and many seatpost mount rear mudguards

• Full coverage
• Won't affect folded dimensions
• Still rolls when folded
• Max tire size: 507-40 (24" x 1.5")

• Front and rear racks will soon be available. The front rack mounts to the head tube and will not affect steering range. It has a quick release for easy removal.
• The rear rack mounts to the seat tube and has an additional supporting mount to the swingarm if high loads are being carried. The rack can also accept a pannier attachment for left and right pannier mounting.
• The rear rack can be folded and it can also be removed easily without tools and mounted in various configurations to accomodate almost any use case scenario.

• Helix custom racks and some seatpost mount racks

• Front rack max weight: 10kg
• rear rack max weight: 20kg (40kg with built in support)

• A custom trailer mount is coming soon. It will allow for quick and easy mounting of a trailer. Trailers with left, right and left and right mounting are all supported. The trailer mounts will also be quick release to allow for quick removal for folding (right mount doesn't need to be removed).

• Helix custom and some thru-axle attachment types such as Robert Axle (right side trailers only)

• Left and right hand mounting with quick release to allow for easy folding (right mount doesn't need to be removed).
• Trailers that use left and right mounts will work.
• Trailer mounting stud is M10 x 1.0
• Trailer mounts work with all drivetrains.

• The upcoming electric conversion will be available in Q3 2022. It will be a rear hub motor from Bafang. The battery will be mounted to the seat-tube universal mount and can be removed for travel. When removed the battery mount will not affect the folded dimensions.
• An extended battery pack will be available that mounts inside of the main triangle space.
• Many third party conversion kits will work, however you will need to get the electric conversion dropouts from us. The battery can be mounted to the upcoming rear seat-tube mount or rear rack for these systems.
• Mid drive motors will not work because there isn't enough space between the wheels when folded.

• Many rear wheel hub motors will work

• Electric Assist: rear hub sensor
• Power: 250w
• Drivetrain: Shimano Deore 11 speed
• Brake mount: IS 6 bolt disk
• Rim: Stan's Crest D with 36 spokes
• 12mm solid axle
• No drag when not powered