Surly Ultra New Disc Fixed Rear Black Hub
The Surly Ultra New is the everyday single-speed hub: a forged aluminum shell, sealed cartridge bearings, a bolt-on axle, and a rear that comes fixed/free flip-flop for track and street or with a 6-bolt disc mount for single-speed mountain and commuter bikes, in 100, 120 and 135mm spacing and 32 and 36 hole. It is not fancy and it does not need to be; it is the hub we build when a customer wants a reliable fixed-gear or single-speed wheel that costs sensible money. This page covers the Surly Ultra New Disc Fixed Rear Black Hub.
The Ultra New is not sold bare. You choose the rim and the rest of the build in the configurator, and it ships from our shop in Georgia laced, tensioned and trued by hand.
Design and construction
The Ultra New shell is forged rather than machined from bar, which keeps the price down without giving up strength, and it rides on sealed cartridge bearings in common sizes. The rear has standard fixed and freewheel threading with a lockring on the fixed side of the flip-flop version, and the disc version adds a 6-bolt rotor mount and 135mm spacing for mountain frames. Axles are bolt-on with solid nuts, which is what a track dropout wants. Black, J-bend flanges. Surly makes the Ultra New in 32 and 36 hole and it takes any standard track cog, lockring and single-speed freewheel.
How it rides
An Ultra New wheel is simple and durable, and the Ultra New has been the default fixed-gear hub for a generation of city riders. The sealed bearings roll for years, the flip-flop lets you swap between fixed and free by turning the wheel around, and the bolt-on axle stays put under skidding. It is the hub for fixed-gear street bikes, single-speed commuters and single-speed mountain bikes on a budget; for a lifetime hub in a color the Paul or White Industries is the step up.
Specifications
| Position | Rear |
|---|---|
| Axle options | Bolt On or QR 10x135mm Rear |
| Driver bodies | Single Speed Fixed Gear |
| Drillings | 32h |
| Spoke head | J-bend |
| Brake | 6-bolt disc |
| Left flange diameter | 54 mm |
| Right flange diameter | 54 mm |
| Left center-to-flange | 37.5 mm |
| Right center-to-flange | 37.5 mm |
| Spoke hole diameter | 2.4 mm |
| Weight | 345g |
| Material | Aluminum |
| Finishes | black |
This listing
This is the iso disc version: Bolt On or QR 10x135mm, 32h drilling, about 345g, in black. Same internals and flanges as every other Ultra New; only the mount and axle differ.
Sizes, fit and compatibility
The Surly Ultra New Disc Fixed Rear Black Hub comes in the drillings listed on this page with the spacing and brake options shown in the configurator: 100mm front, 120mm flip-flop or 135mm disc rear. J-bend spokes in any gauge; we build most Ultra New wheels with DT Champion or Sapim Race spokes and brass nipples.
It pairs naturally with the Velocity Deep V and Chukker, H Plus Son Archetype and TB14, Stan's Crest and any rim in the catalog that matches its drilling. Pick fixed-gear or single speed as your bike type in the configurator and it recommends a spoke count and lacing pattern.
Put it in a custom wheel
Build a custom wheel around the Surly Ultra New Disc Fixed Rear Black Hub — the link drops you into our Custom Wheel Program with this hub pinned, ready for you to choose the rest. It is set up for track and road single-speed and MTB single-speed builds.
What Surly says about testing
Surly's Ultra New hubs use shells of "6061-T6 forged and machined aluminum alloy with medium-height flanges", CroMoly steel axles and fixing bolts in "10.9 stainless steel (i.e. high grade) for corrosion resistance, high strength, and good looks"; bolt caps and cone nuts are also stainless and knurled. Surly states the hubs "spin on non-adjustable 6901 model bearings" with self-adjusting hardware that sets preload when the wheel is bolted in, and that the hollow axles convert easily to quick release. Fronts are 100mm; all are 32h or 36h. Surly's FAQ states "Most of our products (including all frames and forks) are manufactured in Taiwan", and the original 1x1 hub sheet is marked "Made in Taiwan".
Ultra New rears come in 120mm, 130mm and 135mm spacing in Fix/Free or Fixed versions. The 1x1 rear sheet specifies a 10 x 1 x 174mm cro-moly bolt-on axle, a #6200 sealed cartridge bearing, English threads both sides (1.37 x 24tpi RH) and axle nuts torqued to 35-40 ft/lbs.
Certifications
- Made in Taiwan — FAQ: "Most of our products (including all frames and forks) are manufactured in Taiwan"; 1x1 hub sheet: "Made in Taiwan" (source)
Sources on Surly's site:
- Ultra New Hubs
- Surly Component Warranty
- Surly FAQ
- Surly 1x1 Hubs instruction sheet (PDF)
- Surly Hubs collection
Everything in this section is published by Surly. ProWheelBuilder is the wheel builder, not the tester, and the hub reaches us as the maker ships it.
Building it at ProWheelBuilder
Surly makes the Ultra New; ProWheelBuilder is an independent custom wheel builder in Georgia and not the manufacturer. Every Ultra New wheel we build gets spokes cut from the measured ERD of the rim, staged tensioning with a gauge, stress relief and a final true before it ships.
In the configurator you will only see parts that fit this drilling; combinations that are not made are struck through, and the price updates as you pick.
Warranty
Manufacturer's warranty. Surly warrants this product against defects in materials and workmanship. The duration, conditions and claim process are set by Surly and can change without notice, so ask us and we will confirm the current terms before you buy.
ProWheelBuilder. Lace this into a wheel here and the finished wheel gets our own one-year warranty as well as the maker's. For twelve months we replace broken spokes however they broke, and the work on the wheel is on us - truing, re-tensioning, a rebuild where it is needed. If the rim or hub is covered by its manufacturer we put the claim in and chase it; if it is not, we supply an eligible replacement rim or hub at 25% off the current retail price. Carriage both ways is the customer's, and this does not cover wheels built from parts you send in.
Full terms are on our Policies & Warranty page.
Ultra New Disc Fixed Rear Black Hub questions
What does flip-flop mean on the Ultra New?
The rear hub has fixed threading with a lockring on one side and freewheel threading on the other; turn the wheel around to switch.
Which spacing does the Ultra New come in?
100mm front, 120mm flip-flop rear for track frames, 135mm disc rear for mountain and commuter frames.
Is the Ultra New rebuildable?
The bearings are sealed cartridges in common sizes and replaceable anywhere.
Ultra New or White Industries ENO?
Ultra New for a reliable single-speed hub at a fair price; ENO for a lifetime American-made hub with the eccentric option and colors.
Which axle spacing does it fit?
Bolt On or QR 10x135mm Rear. Measure between the inside faces of your dropouts if you are unsure, or text us.
Does it need special spokes?
No. It takes standard J-bend spokes, which the configurator offers in every gauge and finish we stock.
Not sure? Text or leave a voicemail on 470-253-0929 or email info@prowheelbuilder.com — you will be talking to the people who build the wheels.
