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Oct
25
comment Are tubular tires still used today?
Did you ever determine the cause of the punctures? I rarely if ever get actual through the tread punctures with my clinchers (never used tubulars). However, I do get flats, especially with my 23 mm, because the tube gets caught between the rim and the bead when mounting, or the tube was twisted (which is only apparent after I remove the tube and you can see deformation on the tube), or I didn't put enough pressure and hit a pot hole, leading to a snake bike, or the rim tape moved leading to exposed spoke holes. Basically, all stuff that would never happen on tubulars.
Oct
24
comment What kind of road tyres should I go for winter commuting?
You'll be hard pressed to find a modern road bike that has clearance for spiked tires. A touring bike or a cyclocross bike is more likely to have the needed clearance for spiked tires. Surly also makes road bikes that are compatible with larger tires.
Oct
24
comment Does this sound right: $485 ticket for not walking my bike across the street?
A bike is technically a vehicle as far as the law is concerned, unless otherwise stated. If you're going to start to let bicycles ride through the crosswalk, then where does it stop. Are electric assist bicycles ok? What about those technically an "electric bicycle as defined by law but really a full sized scooter with pedals bolted on"? What about a gas scooter with a really small engine? Seems like a slippery slope to me. Best to keep the vehicles and pedestrians as segregated as possible (with mobility devices like wheelchairs grouped in with pedestrian).
Oct
24
comment Tightening torque: 5Nm, 40Nm… how do I tell?
Those numbers are good for quick estimation, but to be more specific, 1 kg at 10cm gives .98 Newtons. This is because of gravity. The force of gravity (F from above equation), is 9.8 N/kg. So a 1 kg mass creates as a force of 9.8 N. The number r in the force above is the distance in meters. So 10 cm is .1 meters. This gives us a torque of 9.8 * .1 = .98 newtons. Using 10 as the force generated by 1 kg of mass is sufficiently accurate for most purposes of estimating torque.
Oct
23
comment triathlon beginners guide
You'll want to try out the bikes and take them for a good test ride. You'll be able to tell which ones are twitchy when you're riding them. In general, a longer wheel base, lower bottom bracket, and more fork rake (distance the fork is ahead of the steering axis) will equate to a more stable bike.
Oct
23
comment triathlon beginners guide
Many triathlon specific bikes are twitchy and difficult for beginners. You might be better off getting a road bike, which will probably be more stable, cheaper, and fast enough for a beginner.
Oct
22
comment Does this sound right: $485 ticket for not walking my bike across the street?
Depending on where you live, it's quite easy to fight a traffic ticket, and you usually don't need a lawyer to do so. You may not get it completely nullified, but you'll most likely get it reduced.
Oct
22
comment Does this sound right: $485 ticket for not walking my bike across the street?
Can you cite what you were actually fined for. Possibly with links to specific laws. Even if you can't point to specific laws, can you describe what you actually did?
Oct
22
comment Tips for getting sponsored as an individual racer?
Even stuff like free jerseys, water bottles and tune-ups can help with your costs. One of my local bike shops has a whole bunch of paraphernalia with their name on it. I even got a free jersey from them, and I'm not even a racer. I just go on the group rides run by the shop. Getting people to know about the bike shop is half the trouble of running one.
Oct
22
answered How can I develop my abs while I ride my bicycle?
Oct
22
comment Why have 29-ers arisen only recently?
650b is actually more new (or old, and then brought back, and is somewhere between 26 and 29 inch, at 27.5 inch). However I think a lot of it has to do with there not being a big enough market to support multiple standards. Having more wheel sizes means that shops and manufacturers have to stock, and manufacture many different sizes of spokes, rims, tires, tubes, forks, frames, and other related items. If there's not a very good reason to have another size of wheel, then it simply can't survive. The size of the wheel requires most of the other parts of the bike to be resized to fit properly.
Oct
21
comment Why does reducing bike weight have such an impact on speeds?
I agree with @DanielRHicks. The amount of work required to get your wheels spinning is negligible. For a demonstration, lift your bike off the ground (or put it on the work stand, or using a trainer, removing the resistance), and see how easy it is to get your wheel spinning really fast. A minimal amount of effort with your arms will get your wheels moving quite quickly. Any additional force required when your bike is on the ground is what's necessary to get forward motion of the bike and the rider.
Oct
18
comment Why does the rear hub (cassette) moves on the axle when I pedal?
From what I can tell, the Burner SuperCycle is a 21 speed (7 sprocket) bike from Canadian Tire, and therefore most likely uses a freewheel. Also, in this case, bent axle isn't unlikely.
Oct
18
comment Must a Bicyclist Riding on a Sidewalk Stop at a Stop Sign?
If you were going for a jog, would you just jog through the intersection? or would you slow down a bit to make sure that there wasn't any cars coming? I guess it depends on the corner, and how far up the intersection road you can see. If you can see far enough up the road to ensure that there won't be any cars, it's probably OK to continue straight on through (assuming it's legal to begin with), but if you can't see the car coming, don't assume they'll stop for the stop sign either.
Oct
18
comment Nice Work Shoes That Won't Get Messed up in Toe-Clips
I have these pedals. They are great if you have one bike, and don't want to ride clipped all the time. I ride clipped when commuting or for exercise, but when I just want to go to the store, I can ride with regular shoes.
Oct
17
comment Nice Work Shoes That Won't Get Messed up in Toe-Clips
Personally, I just keep a separate pair of shoes at the office, as office shoes aren't really optimized for cycling, and my shoes always end up wet when it rains.
Oct
15
comment Why no threaded headset cups?
@Moz Something like that probably works quite well. Parktool makes a headset press that's remarkably similar to what one could make at home (see reviews), but sells for $70. Their high end press is $140, not $300, and similar tools from others can be bought for $70. Which doesn't answer why they aren't threaded, but does give options for installing them that won't break the bank.
Oct
15
comment How can I transport a Madsen bike?
According to wikipedia, a Suburban is 79 inches wide, which is 9 inches less than the bike. If you could perfectly center the bike on the rear rack, it would only stick out 4.5 inches on either side, which is no more than the mirrors. Also, you could remove the wheels for some extra clearance, and they would fit easily in the back of the truck. The only concern is for me is whether the bike can be easily centered on a hitch rack. It would be much easier than climbing on top of the truck to get it on a roof rack.
Oct
15
comment Definitive reference for tire widths?
If the contact was on the chainstay, it should have been contacting both chainstays evenly, unless your wheel was warped, or not seated properly. Are you sure this wasn't the case? On a touring bike that can accomodate fenders, it seems odd that 3 mm (1.5 mm radially) would cause such a problem.
Oct
11
comment Why no threaded headset cups?
There used to be threaded headsets. However I think they have fallen out of fashion. Perhaps they had a tendency to become loose, which would be catastrophic, as you would no longer be able to steer, or your front fork could disengage. Compared to your bottom bracket cups coming lose, which would just cause problems with providing power to the bike (cranks would still be connected to the bottom bracket). Also properly designed (not Italian), they are self tightening, and won't ever come loose, for the most part.