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Bob Jackson Ultra lightweight single speed road bike:

Fabulous example of a Bob Jackson Ultra Light frame. A no compromise single speed road build with some very tasty retro Campagnolo track parts.

  • Superb fillet brazed Bob Jackson Ultra Light frame made from Reynolds 853a Pro Team tubing.
  • Whole bike is only 8.2Kg inc pedals!
  • Stronglight track crank set with Campagnolo 48 tooth chainwheel
  • Single speed freewheel (not a fixie but easy to swap if you want the full fixie experience)!
  • Royce Titanium BB
  • Campagnolo Record track hubs built with Aero Hardox Anodised rims and 20mm sprint tub front, Vittoria 23mm rear.
  • These can be swapped out for some less track focussed wheels with slick tyres
  • Lightweight Froglegs cantilever brake set
  • Easton carbon EC70 seat post
  • Custom leather Fizik saddle with manganise rails
  • Nitto Bullhorn bars
reynolds 853

The benefits of air-hardening steels are particularly noticeable in the weld area of Reynolds 853, where, unlike conventional steel alloys, strength can actually increase after cooling in air immediately after welding. 853 is heat-treated to give high strength and damage resistance, and the steel properties allow thin walls to be used, so that lower weight but fatigue-resistant structures can be made.

Why Reynolds 853 works:

UTS: 1250-1400 MPa, density 7.78 gm/cc

The chemistry includes carbon, manganese, chrome, molybdenum, silicon, copper.

The interaction between the alloys result in a fine grain structure that forms with air-cooling without the traditional “quenching” (fast cooling in water or oil) process. High strength from bainitic phase steel after a series of cold-working operations.

Heat-treatment to the 853 specification raises the yield strength for the entire tube, increasing dent and impact resistance.

Reynolds have two specific variations in 853 a) ProTeam: the thinnest wall tubes made for road bikes and b) DZB: for Double Zone butted tubes, which are particularly suitable for ATB and 29er frames. This helps reduce or eliminate the gussets normally required to pass the stringent EN fatigue testing standards.

For more on the difference between 853, ProTeam and DZB, watch this 80 second video summary: