Soma Smoothie HP steel road bike gets disc brakes w/ sleeker frame to match

The new Soma Fab Smoothie HP road bike took what they loved about their steel frame and made it all better. And disc brakes and thru axles are just the start, adding more braking power to a stiffer yet more compliant frame.

Soma started with the need to update their classic road bike with modern group compatibility. What started with the brand itself as a straight-tubed classic had, over the years, received a sloping top tube, carbon fork, and upgraded Tange tubing.

closeup of soma smoothie hp steel road bike swappable dropouts

Now, it gets disc brakes, and an entirely new frame using Tange’s Prestige Japan tubing with a mix of tube shapes and walls to make it “High Performance”, hence the HP in the model name.

The Smoothie HP gets the thinnest walled downtubes of any of their bikes, but the diameter increases to oversized 34.9 and 38.1 millimeters (depending on frame size).

closeup of soma smoothie hp steel road bike chainstays

Those, combined with stiffer oversized and tapered chainstays (32x18mm oval) give the bottom half of the bike a laterally stiffer, stronger platform for pedaling torque.

closeup of soma smoothie hp steel road bike top tube

The top tube gets ovalized, too, which further improves lateral stiffness but adds a bit of vertical compliance. It still slopes, giving the bike a more modern look and feel.

Soma kept the geometry somewhere between endurance and stage racer, which they say provides a balanced, smooth ride for general (and now somewhat high performance) road riding where the emphasis is on comfort and ride quality.

closeup of soma smoothie hp steel road bike frameset

Modern upgrades include:

  • Flat mount disc brake mounts
  • 44mm head tube for tapered forks
  • Carbon fork included with frameset
  • 12mm thru axles
  • ED rust-proofing coating inside the frame
  • 700x32mm tire clearance
  • Candy Apple Red paint

Traditional touches and backward compatibility remain, though:

  • Threaded BSA bottom bracket standard
  • Fender eyelets
  • External cable routing
  • Downtube shifter bosses
  • Rim brake mounts with clearance for 57mm long-reach calipers

2022 soma smoothie HP disc brake steel road bike geometry chart

Framesets run $1,149.99 and are available now.

SomaFab.com

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Dockboy
Dockboy
1 month ago

Rim brake mounts? With a thru axle?

Choncho
Choncho
1 month ago
Reply to  Dockboy

Yeah i totally think they should have done canto bosses as well. Real shame

Dr_LHA
Dr_LHA
1 month ago
Reply to  Dockboy

At least the rear dropout system is modular and replaceable, so you can likely replace it with a QR setup if you’re going to run rim brakes. No clue about the front fork?

Dockboy
Dockboy
29 days ago
Reply to  Dr_LHA

Yeah there’s some sort of mount up there but I’d be shocked if it were for a caliper brake.

Dinger
Dinger
29 days ago
Reply to  Dockboy

They call for it in the spec. It’s also clearanced for 57mm reach calipers, which is good for tire clearance but pretty limiting to brake choice.

I bet most would build this up with disc. Almost everyone who wants a steel, rim brake bike must have one by now, right?

Triplin
Triplin
28 days ago
Reply to  Dockboy

The combo is unusual of course, but is there anything technically wrong with it?
I recall this article discussing much the same. https://bikerumor.com/why-no-road-bikes-with-rim-brakes-and-thru-axle/

You probably can’t find a non-disc hub in thru-axle, but a centerlock disc hub w/o a rotor looks pretty clean… just build it with a compatible rim.

Velo Kitty
Velo Kitty
1 month ago

The front center dimensions are too short to run 32 mm tires comfortably.

Dinger
Dinger
29 days ago
Reply to  Velo Kitty

I noticed they do not specify a different tire clearance when used with mud guards, too. Those will also crowd toe overlap, which I believe is governed by CPSC here in the US.

d $
d $
1 month ago

wonder if the dropouts can be replaced with a sliding set to run it as a singlespeed.

Hank Wirtz
23 days ago
Reply to  d $

No. The modular dropouts can get you 142mm TA or 135mm QR, and ISO or Flat Mount brakes, but all are fixed wheelbase.

They’re made by Long Shen and are model LR28. I’ve got them on my Soma Fog Cutter.

https://www.somafabshop.com/shop?&search=lr28