Fit Aitken S3.5 Frame Review

This Aitken frame is a throwback to a frame that fit made in 2008. It has a clean retro look at a light 4.8 lb weight. Made in America, the Fit Aitken frame will hold up to all kinds of riding. Available now for just 409.95

βœ… American Made

Price & Weight are comparative to how good the deal is.

Good deal = 5 Star

Bad Deal = 1 Star

Fit Aitken S3.5 Frame Overview

This limited edition re-issue is an identical replica to the original, first produced in 2008.

The S3.5 is an American made FIT classic with a light and responsive feel.

  • Heat treated, butted, air-hardening Supertherm tubeset
  • Tear drop downtube and tapered seat stays
  • Laser cut seatstay and chainstay bridges
  • Thread On brake mounts
  • Integrated seat clamp
  • Micro dropouts
  • American Made

From Fit

Fit Aitken S3.5 Frame Specs

Price: $409.95



  • 20.75"
  • 21"
  • 21.25"

Learn about frame sizes here


TOP TUBE LENGTH 20.75β€³,21β€³,21.25β€³
REAR END LENGTH 13.65β€³ – 13.9β€³
HEAD TUBE ANGLE 75Β° - Learn About Head Tube Angle Here
HEAD TUBE STYLE Integrated (45Β°/45Β°, 41.8mm)
SEAT CLAMP Integrated
BB HEIGHT 11.8β€³
DROPOUTS 14mm, 4Q-Baked
GYRO TABS Optional
WEIGHT 4.72 lb (2.14 kg)
TUBESET Butted True Temper Supertherm

Fit Aitken S3.5 Frame Geometry

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A: Top Tube Length: 20.75", 21", or 21.25" - Learn what size is right for you here.

It's sick that they included a 21.25" frame size in there. Shout out to all of my tall riders out there.

B: Chain Stay Length: 13.6” to 13.95" - Learn About Chain Stays Here

This is a really long chain stay. Slammed, it is 13.6" and not many frames are this long maxed out. You will have a lot of control but it will not be very responsive.

C: Head Tube Angle: 75ΒΊ

Steep head tube angles make the bike "snappy" meaning more responsive to fast turns.

A less steep head tube gives you more control.

D: Seat Tube Angle: 71Β°

E: Bottom Bracket Height: 11.8"

F: Stand over height: 8.25"

This is a medium standover. A medium standover gives you more control with barspins and t-bogs. while also making whips a little easier.


One thing that Fit does really well is make good parts. I know I was pretty harsh on their 2020 line reviews. But the frames they make are top notch American made quality. I love the retro look of this frame. It's also pretty light.

Buying a frame?

Don't forget a bottom bracket here

Don't forget to get a headset here

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