Johan Bornman

Just about all hubs, except those sold on bikes at Makro, have sealed bearings, including Shimano hubs. Before you decide on any hub, first ask the price of: a) pawl b pawl spring c) Freewheel body This little exercise will reveal whether the importer keeps stock of what are essentially consumables on hubs. Do not buy a hub for which you cannot source spares locally.

I'll say this again: we already have the maximum traction (in other words, tyre performance in braking) that the bike design can handle. It is no use making tyres better in the front since they already cannot skid. It is no use making them better at the back since at maximum deceleration only the front wheel makes contact. Tyre design is already even better than what we can utilise,

Depends what you mean by modulation. I see modulation as two issues: 1)The smoothness of the mechanism and therefore the predictability of X-amount of finger force. 2) The way the freeplay is taken up (preferably quickly) and thereafter how the increased finger pressure translates to increased stopping force. You may want to include effort (finger pull) in the modulation equation. On a new cable brake, modulation is excellent. On worn cables, it is poor. The amount of effort required to stop the bike can be increased or reduced at the designer's will. By simply modifying the lever, you could exert more or less force and indeed, some fancy V-brakes have a variable lever that takes up freeplay quickly but then reduces leverage to improve modulation.

The device on a vehicle that helps you stop is called a brake. Note, no "e" in brake, unless it is broken. I think you need to do some research as to why trucks still have drum brakes. I'll give you a clue. Mileage has nothing to do with it. Like Saddam, you use "efficient" too lightly. Stick to its meaning. The smoke you see billowing out of truck brakes is the friction material burning. Incidentally, it is the same friction material used on disc brakes. Bringing brake drums into the argument isn't helping this debate.

Hmmmm. Last time I looked all heavy trucks still have drum brakes. You still haven't explained efficiency. Remember, cables don't stretch and there is no significant loss of force applied. No cables snapping - is that really an issue? Adjustment - is that an issue? I really think we're looking at disc brakes for all the wrong reasons. I have already acknowledged conditions where they do makes sense but I just see the same old fallacious arguments over and over again.

I can't remember the post. However, mechanical advantage in brakes has a very specific meaning and perhaps this is not what you intended in your question. The mechanical advantage of a brake is simply the amplification of force applied at the lever, over the force experienced at the caliper. I don't think this is the question, but correct me if I'm wrong. The disadvantage of a cable is simply friction and maintenance. Hydraulic systems always feel good whereas brake cables quickly deteriorates, especially the long rear one with openings everywhere. The advantage of a hydraulic rim brake would simply be the convenience and feel of hydraulic, nothing else. In saying that I include the fact that a grippy, sticky cable doesn't allow you to modulate well and a hydraulic system would modulate better. Since we already have enough mechanical advantage (as explained above) with cable brakes, we don't need more for actuating that same brake caliper with hydraulic. Enough is enough, so to speak.

I don't understand what you mean by efficiency in this case. Perhaps you can explain or give an example pertaining to brakes.

I recently switched to a Cateye Adventure. It has an altimeter, total accumulated climb, temperature, countdown mileage counter whacchamacallit, and all the other stuff. It is small, doesn't require charging every night (works off a small CR2032 battery) an is nice and compact. I've given up on charging Garmins and putting up with Polar's crap.

OK then, go ahead and tell us how to mis-install an XTR brake and make it noisy.

No, don't do that. If your spray contains chlorine, it will make the rubber go gooey. You do get chlorine-free sprays but they are slightly more expensive and will specify on the can that they are Chlorine-free.

Oi, the pull generated by that little bellows is less than what a flea can pull - nothing. The brake lever returns because of a spring attached to the master piston. The only thing I can think of that will prevent it is a swollen piston ring or a weak spring or very gritty lever pivots. @ the OP. As for the mixing of the various fluids, Dot 3 and 4 shouldn't be mixed. Here's a table of the various DOT fluids, the first column is obvious, the second one is the dry boiling point, the third one its composition and the fourth one, whether it can be mixed with other fluids OF THE SAME COMPOSITION. In other words, only mix Dot 4 and 5.1 Presentation1.pdf Sorry, can't get the table in here as an image. Type Boiling Point Primary Constituent

There is no adjuster on the shock remote, only on the fork. The adjuster is the lockout threshold setting and really only required on the fork.

Statins have been thoroughly discredited. However, it is such a big business - the leading revenue-spinning drug out there, that it will be difficult to the truth to ever reach the patient.

OK, I know which ones those are. They are not chamfered like other headset bearings and are almost perfectly square except for a small chamfer on the inside race. I have them for R420-00 for the set. The non-chamfered, non-bike ones are much cheaper but may not work, depending on the headset. These one-offs and esoteric Lefty-like stuff is expensive. I wish manufacturers would just stick to standards. They look like this:

Give us the bearing dimensions, including any tapers, and I'll see what the alternatives are. But, 1 1/2 inch bearings are expensive animals.

If your frame is for Shimano pressfit, you cannot fit a BB30 in there. Decide which child you love most - the frame or the crank, and swap out.

No

One McGuyver Two McGuyvers

I doubt there is a distributor in ZA. I haven't seen a Tange headset in many, many years.

I have a position for a senior mechanic/workshop manager in a business where service, not retail is the core business. This person will have 8 or more years of experience in the workshop and would have managed junior mechanics and support staff. This busy workshop requires someone with industry contacts, good mechanical skills, excellent product knowledge, good communication skills and be easy on customers. Salary and inventive schemes will be negotiated in private, not on this forum. If you think you fit the bill, send me your CV. You will work in the north-west of Jhb.

Since 29er bikes (on paper) require more torque to turn the wheels and move the bike forward, 29er hubs should (technically) be stronger in the torque transfer department. Think about it this way: if you have a long spanner and you want to tighten a bolt, you would require less effort than if you had a short spanner. Conversely, if you want to transmit torque through a longer lever (longer spokes) you would have to apply more force. Some hub manufacturers have now rated their hubs for 29 and 26er use, notably Shimano. My guess is that none of us are strong enough to break a 26er hub on a 29er wheel and therefore nobody (other than Shimano) has bothered with this rating. On paper though, you need stronger pawls and ratchets to do the same job you previously did on a 26er.

I know the stuff. Good. I discovered if you put pesto in it becomes truly yummy.

This is fanatastic, just what he predicted. What an althlete!

Earlier than 2000. Those are still dual pivot brakes and Campag moved to single pivot rear brakes sometime in early 2000. They didn't differ from year to year and stayed the same for ages. So you can call them anything from about 1994 to 1999 model, whatever suits your agenda.

No they won't. With current brakes you can already do an endo, no matter what your weight. On the back, you can already drag the wheel without much effort, so extra stopping force there would be a waste too. Benefits have to come from other areas, not quickness of coming to a standstill where we are already at the max.