D_XZ":1qqvpg3g said:
It's the seller who made the original statement that this modification hasn't affected frame integrity. It's fair for any potential buyers to ask on what basis he can make that statement. Just saying that someone rode it a couple of seasons is hardly a scientific/expert explanation.
How does anyone know how far/hard this guy rides? And if he would notice if the frame was pulled slightly out of alignment etc..
If the frame has been significantly weakened then all we know is that it's had 2 seasons riding to help it get to breaking point.
Answering the (ok sarcastic) questioning by stating that someone else knows nothing about Ti without offering your own credentials or again explaining why they are wrong doesn't help your credibility.
At the end of they day you're the one selling the bike so you should be prepared to back up such strong statements with something more solid. You are asking someone to part with almost a grand here.
Educate yourself.
http://www.enigmabikes.com/technical-materials.html
Titanium
6AL-4V, also known as grade 5 titanium is notoriously hard to form into seamless tubes, a feat very few companies have mastered, most opting for technically inferior welded/seamed tubes. We have worked long and hard to master the procedure and we have! We are now proud to offer our Excel frame with seamless 6AL-4V seamless double butted tubes!
The main gains over 3AL-2.5V are:
Increased stiffness; 6AL-4V is 5% stiffer than 3Al-2.5V.
Increased strength; 6AL-4V is 20% Stronger than 3AL-2.5V which means we can comfortably bring down frame weight.
Lighter; 6AL-4V may only be 1% lighter than 3AL-2.5V but add into the equation the extra strength and stiffness and the bonus is we can bring frame weight down by up to 10%!
All of our dropouts, cable stops and head tubes are CNC machined from 6AL-4V titanium billet as the alloy is very easily machined and is extremely strong.
3AL-2.5V An alloy consisting of 3% aluminium, 2.5% vanadium, and 94.5% pure titanium. Also known as grade 9, is easily formable, excellent corrosion resistance and superb fatigue life make 3AL-2.5V the most used titanium when making an Enigma frame. All of our frame tubes are 3AL 2.5V which are seamless and cold drawn and in some cases double butted. Double butted tubes have variable wall thicknesses, usually thicker at both ends for strength and ease of welding and thinner in the middle of the tube to save weight in a less stressed area.
The only downside of butted tubes is their higher price as they are harder to produce than plain gauge.
3AL-2.5V typically has an ultimate tensile strength of 900 MPA
http://www.enigmabikes.com/technical-frame-repairs.html
Titanium Bottle Bosses per pair £50
Down tube STI/Ergo Stops per pair £60
Brake and Gear cable stops £30 each
Zip Lock Hydraulic Hose Guides £30 each
New Brake Bridge £75
New Chain Stay Bridge £75
Disc Mount £100
Mud Guard Eyes per pair £50
Pannier Mounts per pair £50
Crack Repairs price on allocation
Frame Re-brushing £50
Frame Bead Blasting £75
Full Frame Mirror Polishing £125
Bottom Bracket Shell Facing and chasing £30
Head Tube Re-facing £40
Re-align Gear Hanger £25
Realign Drop Outs £30
Full Frame Re-alignment £75
NOT that any repairs are needed, the bike weighs next to nothing and rides like a dream.
