Fixed Super Light Super Safe

Chain ring looks good .. Fibrelyte? don't skid stop it though, that'll pull the teeth off it quick fast!

Probably... Oswald i think suggested a alu cog, but i needed something cause of all the whining.

Its actually quite hard finding a 3/32 15T lightweight cog...

Avoid aluminium sprockets (apart from >20t for hill climb use) as they are not Super Safe. Echo Ti would be nice, 19g of nitrided drillium for only £35, although the long boss of trials sprockets can create problems (chain line, no lock ring clearance) on track bikes, so it would probably need to be ground down a couple of mm.

sexy!

Chain ring looks good .. Fibrelyte? don't skid stop it though, that'll pull the teeth off it quick fast!

Yup! Fibrelyte :-)

No skidding!??! Fuck... How am I going to brake without a rear brake?!

yep .. that was me! I've never had a problem with aluminium, but that 19g Mr Tester posted looks very nice :)

You've got a front brake! and I'm sure Ed will do some awareness cycle training if you asked nice ;)

I'm no expert in chainrings but I don't think skidding is going to cause much harm to the teeth on that. The teeth on the carbon chainrings are known to snap during shifting operations, of which yours will be doing none. Everyone thinks carbon is such a fragile material and that it will break in anything other than a perfect world, but I think its fit for purpose for its intended usage, ie transmitting load to the chain under pedalling.

I could of course be talking nonsense, but thats my hunch, perhaps mdcc will clarify.

I hope its safe for skidding... mine has been so far. They're designed to take huge strains when on the track so I doubt a skid would be that bad for them

I will venture an opinion from Castle Ignorance:

• I think resisting to slow will be fine
  
• Personally I'd avoid skidding due to the abrupt stress exerted on the ring
  
• Unless I was riding your bike, when I think skidding would be fine
  

I think its fit for purpose for its intended usage, ie transmitting load to the chain under pedalling.

Well, up to a point, but...
Carbon teeth are weaker than high strength aluminium alloy (e.g. 7075), but just about strong enough when used with low chain tension, i.e. big chainrings for testers.

Fixie skidding is not a low chain tension activity at the best of times, and CB's ring isn't very big making matters worse.

I'd be happy to use a 54t Fibrelyte on my T3, it would last years because I only do about 500 miles a year, it stays clean, the ratio of crank length to chainring radius is small and I don't do maximal sprint efforts on it. I'd be much less enthusiastic about a 42t ring on my hack bike for reasons which are pretty obvious from the foregoing description of acceptable service conditions for carbon chainrings.

Just weighed a 39t/135pcd aluminium road inner and it's 40g, that's a cheap (Veloce) one, I suspect TA Competition might be lighter. For the sake of 12g, I'd have gone with a metal ring in keeping with the Super Safe design requirement.

They're designed to take huge strains when on the track

On bigger chainrings than 42t, and shock loads from skidding can easily exceed the starting loads of world class sprinters; a simple way to see why this must be so is to look at how rarely kilo riders get wheelspin off the line.

For the sake of 12g, I'd have gone with a metal ring in keeping with the Super Safe design requirement.

This. Re-read your design brief fibrelytesnapper

Hi, i just joined LFGSS after skimming through this thread. Seem to be talking bout allot of the stuff i considered when i was building my light but sturdy fixie.

For reference im over 100kg and don't ride smooth. I've broken all kinds of bikes/parts and this is my (just over 5kg) fixie.

Please excuse the FB links for photos, ill learn to embed by the time i post in the hello here are all my bikes thread (which one is that?).

Spec:
Frame and fork: DB 3Al 2.5V Ti of my own design
.
Wheels: Echo hubs (i know their not light but they are pretty),
ZTR olympic rims (32h),
cx-ray spokes,
alu nipples and conti GP supersonic tires 26 by 1.00 (sadly dont make these any more). Did have supersonic tubes aswell but being fat bastid led to pinching very quickly.

Drivetrain: FSA K-force cranks (broke the Tune fastfoots),
Tune Ti 36t chainring,
E-thirteen chainring bolts (tunes ones failed),
Salsa ring dinger (really annoys roadies seing that on the K-force)
Echo Ti 12t sprocket (seen you mention these but this is the proprietary splined one)
KMC X9Sl gold
Eggbeater stainless (had the Ti ones with matching red springs but they broke)

Tune Bobo headset
Syntace F99 stem (Ti bolts)
Random carbon headset spacers.
Schmolke TLO custom bar
Poshbikes nitrile grips
Tune speedneedle saddle (last gen before Tune took production in house, had a red one before that died in a crash)
Tune seatpost
Tune alu torx seat clamp

http://www.facebook.com/photo.php?fbid=10150850567860627&set=a.471731990626.385880.532475626&type=3&theater
http://www.facebook.com/photo.php?fbid=3107264340943&set=t.532475626&type=3&theater

good suggestion! too bad youre late Damo

Ian. I am old. This thread has gone on a long time. Forgive me if I can't recollect all the suggestions made for you and your "project".

I note that Fox has finished his carbon project bike.

You're younger than me.

Who isn't?

BTW - Iain I haz BB toolz courtesy of Hovis Brown multiseed batch loaf.

Who isn't?

Saucy fucker!

I note that Fox has finished his carbon project bike.

Lies - no wheels built up yet and was still dithering over details on Tuesday. Is coming along though, but the comparison is unfair as component sourcing wasn't a matter of research and bodge with Fox, it was a matter of finding things with tasteless bits of red on them instead which is altogether easier.

They still have the same end point then? Tasteless carbon bikes?

Not quite, I think the end-point for this one will be a snapped tasteless carbon bike.

I see.
Won't someone think of the children?

Get back to your babysitting >>>

The first squirrel i find will get it good!

.

Speaking of squirrels
http://d24w6bsrhbeh9d.cloudfront.net/photo/5399855_460s.jpg

aaaaaaawwwwwwww