A supple-riding disc-braked Gravel road bike for Mark, with T47 BB, super-clean flat-mount rear disc and internal brake routing. The chainstays have my crafty crimp-free shaping at the tyre and chainring, AND yet plenty of clearance for large tyres!

 







 

A bike for endurance rides on road and gravel.; the smaller diameter Columbus Life main tubes in “OS” sizes give a supple ride that will lessen rider fatigue during long hours in the saddle. On anything more than an hour long ride, a stiff frame is neither smart nor efficient. As it was explained to me by another customer Fraser, Mark borrowed his Gellie bike and was impressed by the comfort and speed during a two fast 200km audax events, and ordered this frame soon after. Fraser’s bike has travelled approximately 35,000km.

The rear hydraulic brake hose is internally-routed for a clean look, running the entire length inside the frame, made possible by the recently introduced larger diameter “T47″ threaded bottom bracket.

The T47 is a great development. I have ONLY ever used threaded bottom brackets because they have unrivalled reliability and are wonderfully noise-free in use. My caution and scepticism about press-in BB bearings has been rewarded. Who asked for creaky, troublesome BB bearing systems anyway? Press-in bearings are entirely about making it easier to mass-produce carbon-fibre frames and they are not worth the downside when they go wrong.

The tapered head tube is compatible with tapered forks which have become the road standard. This frame uses the Columbus tapered head tube and it’s pleasing that they have got the dimensions right.

The frame is Di2-ready with reinforced ports, done right! (see below) Doing it this way takes extra time, but it is the benchmark for a robust yet minimalist port.

Flat mount rear disc brakes have a fantastic clean design and are a great development for Road bikes. 

 

 

 

Tech extra; 

 All the frames I make are constructed from tubing with thinner walls than the mass-produced “equivalent” frame. The craft is in making a robust product from what in the wrong hands would be considered too delicate to use.  

 To benchmark a “supple” build, I have constructed and ridden frames far more supple than this, proving that they are viable, even when ridden with a 12kg front load.  It pays for me to be knowledgeable!  Mass-produced frames are not supple, since they must be made for the heaviest rider who will ever walk into a shop and buy it, and that is usually not you! I have inspected and or repaired, and weighed many mass-produced steel frames, some sporting Reynolds or Columbus tubing stickers, yet all but one used heavy, thickwall seat and chainstay tubes, and all were mysteriously 2.1 to 2.3 kg’s in weight. The “same” Gellie frame weighs 1.6-1.7 kg.  

It takes time and care to measure and locate the chainstay and provide clearance for larger tyres. Excessive crimping of the chainstay to provide clearance for the tyre and chainring is in my opinion lazy, mediocre framebuilding, a seemingly easy solution but that drastically reduces the durability of the chainstay!  Where a tapering chainstay was designed to flex along its length (for additional durability and a lighter-weight), a crimped tube flexes at the crimp, and fails early. I am so disappointed when I see so many young new framebuilders, and some older ones who are currently doing this.  

Reinforced ports for internal cabling and Di2; I’ve done my research and this style lasts where lesser styles do not. So I make the extra effort for everyone’s benefit. Think about it; drilling a hole in a thinwall frame tube, close to where the fork is hanging off it requires a careful considered approach. The impact in terms of  stress concentration is huge, and the issue is how the frame tube performs in being subject to load cycles numbering in the thousands. The current fashion for “clean” looking internal guide ports, with no external reinforcement plate, or a small fillet of silver-solder built up simply does not cut it, unless you want a show bike or will only ride it to the cafe. That style of internal routing port HAS developed fatigue-cracks prematurely in the past, and the recent craze for putting pictures of that detail on the internet does not alter that. If it sells more frames by your business, then that’s an approach to selling that I cannot understand. Small fillets of silver-solder have not proven to be rigid enough to to act as a reinforcement against fatigue-failure in this application. The small cable guide tubes are also made of low-strength material which only makes worse the potential for problems. I hope this explanation will clarify for you the shortcomings of what is currently popular in images of custom frames on the web. I prefer knowledgeable and discerning customers, and I will not take shortcuts.