Current Projects chat and miscellany

They're both Welsh, so probably.

#sckbrn

rep!

If you could seal dura aces, that'd be sick

They're both Welsh, so probably.

Reported for racism.

Last time I adjusted the cones, I'm pretty sure those outer shiny bits were just covers. Are those not modern hubs?

These ^ are C-record LF hubs. Here below are the modern Campagnolo track hubs. As you see, the difference is exactly the "outer shiny bit" or the absense of such in modern ones. But you're right, i referred to the cover caps as to "seals", but actually real track hubs wouldn't have those - MTB ones would.

New, shorter, black stem.

One. Component. At. A. Time.

Re hubs,
no bearing is truly sealed, although cartridge bearings tend to be sealed better than cup and cone systems. cup and cone systems use bigger ball bearings, but i think it'd be pretty much impossible to tell the difference between the two when you are actually riding.

the sealing on loose bearing systems varies, i know that the campag track hubs are pretty useless for day-to-day use, and have heard that the dura-ace ones are fairly similar. conversely, the sealing on some of shimano's other hubs is fantastic, although this is useless to anyone who wants a shimano track hub for daily use.

cup and cone systems will require more regular maintenance, but are fairly easy to maintain. however if you leave them without maintaining them for an extended period of time then they will fuck themselves. cartridge bearings are easy enough to maintain as well, you just knock out the old bearings and put 2 new ones in with a mallet.

personally i wouldn't spend a massive amount on road hubs, as the bits which wear out can be replaced for not very much at all, but that's just me..

Not being awful, but I seriously doubt that is down to your hub bearings. **Your weight **will probably have more of an effect.

ftfy

Heavy blokes go down hill fast, as aero drag on the body tends to rise as mass^⅔ whereas the force pushing you down the hill is directly proportional to mass.

no bearing is truly sealed,

So the >30bar external water pressure will deliver a high velocity jet into the ~1bar internal air pressure, since the shaft runs through a not "truly sealed" bearing between the internal machinery space and the external propeller.

So the >30bar external water pressure will deliver a high velocity jet into the ~1bar internal air pressure, since the shaft runs through a not "truly sealed" bearing between the internal machinery space and the external propeller.

okay okay, i bow down to your infinite wisdom.
the bearings that are commonly used in bicycle hubs are not truly sealed.

the bearings that are commonly used in bicycle hubs are not truly sealed.

If they have contact seals*, they are truly sealed. The pressure differential needed to force fluid past the seal is obviously much smaller than it is for submarine prop shafts, but it still exists.

*And they do, for the most common cartridge bearings

so I have seals on my da 7600 hubs, Ive been using it most days but no rain...will they get ruined?

hhsb/rat

what frame?

i think you went a bit overboard with this post, MT
=))

So the >30bar external water pressure will deliver a high velocity jet into the ~1bar internal air pressure, since the shaft runs through a not "truly sealed" bearing between the internal machinery space and the external propeller.
http://www.navy.mil.za/newnavy/submarines/images/type_209_1400_mod_san.jpg

so I have seals on my da 7600 hubs, Ive been using it most days but no rain...will they get ruined?

I rode mine on a 30 mile commute for 14 months, every day, all weathers with zero maintenance. Stupid, I know, but hey ho. After this time the cones were shagged, the balls looked okay (but are so cheap I'd replace regardless), and the hubs were still as new. New set of cones from loosebikeparts.com (£15), new balls from some link Tester posted a while back (£4?) and I'm good to go, albeit with more frequent checking/repacking/greasing this year.

I haven't yet, but have been meaning to just cake the area around the cone/seal with Vaseline or similar. I assume it'll get crap caked onto it, but should help the seal a bit.

That may actually function to attract grit etc to the area.

That was my immediate thought, but a guy I know that's been riding forever swears by it. And I figure it would attract a load of crap, get all caked and clogged to the outside of the Vaseline, but as long as there was enough on there and it stayed put, then you should have a cruddy, grimy shell with clean Vaseline underneath and fresh, shiny bearings under that. Sort of like waxoyling a car's chassis (or my ghetto "just not fixing that slight oil leak as an anti-corrosion" technique).

I rode mine on a 30 mile commute for 14 months, every day, all weathers with zero maintenance...After this time the cones were shagged, the balls looked okay (but are so cheap I'd replace regardless), and the hubs were still as new...

so you're saying the cones were screwed, but the insides of the hub - the other end of where the balls are rolling - was still in tact? i find this hard to imagine, tbh, did you look good enough? =))

Just paid for this...can't wait to try out 753!


Bars and bar tape arrived at work. Conveniently I bought my allen keys and brake lever, so about to go fit them in my lunch break.

ftfy

Heavy blokes go down hill fast, as aero drag on the body tends to rise as mass^⅔ whereas the force pushing you down the hill is directly proportional to mass.

Lol, cheeky, but probably most of the reason!
Me + bike probably around the 90kg mark, though there are much bigger riders (weigh 90kg+ on their own) with much more aero positions that still don't roll as well. Guess man weight + 27s + 28c's + smooth hubs = fast rolling, no?

I was out-rolling loads of roadies on the charity ride I did at the weekend... Me on my alu frame vs roadies on all sorts of carbon things. Me = 110kg+

Of course, going back up the hills kinda sucked.

Just paid for this...can't wait to try out 753!


I built that frame :)

Before:

After:

Looking at the photos, I think my saddle needs adjusting, which I hadn't noticed.

And it also makes me think that the frame might be a bit small for me...

#sadface