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Jan
28
comment early 1993 Trex 4200 aluminum frame
Did you put the axle in the right way around? some of them have an offset to account for the fact that you need a longer axle on the crank side in order to accommodate connecting the chain rings.
Jan
26
comment Worries about a gear ratio of 1:1?
I guess if it's the easiest gear, you might spend some time in that gear, but I personally wouldn't set up a bike such that I would be in the easiest gear for a significant amount of time. The most extreme gear on either end should not be something you use a lot in most cases because it means that you should probably have a gear or two beyond that one in case the riding gets a little tougher or easier than you would usually encounter.
Jan
25
comment Ideal % jump between gears?
Ideally you would have a CVT type system like Nuvinci, but weight and complexity have resulted in such system being uncommon on bicycles. If you are working with derailleur gears using cogs, we've basically moved to the point where there is 1 tooth difference between adjacent cogs, with 2 teeth as the cogs get larger, and perhaps 3 teeth between the final 2 cogs. This is more a requirement to get the required range, and not because it is ideal in terms of efficiency. If they could get the same range with smaller steps, they would. Smaller gaps is always better in terms of efficiency.
Jan
25
comment Flywheel on a bike to smooth things out?
Also would affect braking if it was on the wheels. I didn't downvote, but I'm not even sure if these questions are really on topic. They are kind of "opinon" and aren't really answerable. They're more hypothetical, "what if" type questions that require long drawn out discussions as opposed to a concise answer with sources to back it up.
Jan
25
comment Flywheel on a bike to smooth things out?
I think that a flywheel on the chainrings would cause more problems than it is solve. Being able to stop pedalling quickly as you go into turns is a pretty important feature.
Jan
22
comment Multi directional release pedals for road bicycling?
@Carel I tend to have strong disagreements with that rule. Road pedals (like SPD-SL or LOOK) are great for guys doing grand tours who will clip in at the beginning of the ride and then won't unclip for another 170 km. However, for cyclist who has to deal with traffic lights, cars, pedestrians, and might have to walk around in their shoes, something like SPD with a recessed cleat and the ability to clip in on both sides of the pedals makes things so much easier. In my opinion anyway.
Jan
21
comment Multi directional release pedals for road bicycling?
It's also worth mentioning that Shimano makes a multi-release cleat for their SPD system that will release both when pulling up as well as twisting. They also have the Click'r pedal system which is specifically designed to make it easier to clip in and clip out for recreational cyclists.
Jan
21
comment Left side isolated granny gear, right side all other gears? Possible and practical?
I think that this is a lot of complication for something that wouldn't be much benefit over a triple chainring. Using chainrings with 48-36-26 with a 12-30 cassette would give a plenty easy "granny gear" for the hills most people would willing to approach on a bike. Having a 20-50 super-granny gear as you propose would mean you were only going 4.5 km/h at 90 RPM, which is less than walking speed. At that pace, you might as well get off the bike and walk, as it will be more energy efficient.
Jan
21
comment Triple chainring + nonstandard sloped cogset. Can this work?
Apparently the Shimano XTR electronic shifter employs a similar method to the synchrobox and will shift both the front and back derrailleurs together to minimize cross chaining.
Jan
20
comment Can an aluminium frame rust from the inside if water has been in it for some time?
You do see stainless steel in bicycles. Just Google stainless steel manufacturers and you will see many manufacturers of SS bikes. But they tend to be pretty pricey. A well cared for chromoly steel bike will last decades, so there isn't really much demand for a bike with the added cost associated with purchasing a stainless steel bike. Plus, stainless can still rust if it isn't cared for correctly. If you want a true corrosion free bike, you should be looking at something like titanium.
Jan
20
comment At what temperature do you say its too cold to ride a bike?
-10f translates to -23c. If you travel at a slow speed of 15 km/h, that will yield a wind chill of -33c. At this temperature, you can get frostbite on exposed skin in 10 to 30 minutes.
Jan
13
comment Gear shifts and drive speed on bikes
53/19 is an even smaller ratio at 2.79. Unless I really don't understand gear ratios.
Jan
13
comment Gear shifts and drive speed on bikes
Wouldn't 53x13 yield a gear ratio of 4.077? 53/13 = 4.077. If i use that gear ratio with your numbers it works out to 15.2 km/h, which is the same result I get with my formula.
Jan
13
comment Are presta valve cores universal?
I've snapped a few in the past. I found it helps to not unscrew the valvle completely when inflating. Usually better to just give it a couple turns to the point where when depressed the air escapes. If air can get out, air can get in, and usually unscrewing it more gives the screw a higher probability of bent and breaking off.
Jan
13
comment Windows Phone as a Bike Computer - What is the current State of the Art?
I guess turn indicators do help a bit, but are a long way off from showing actual maps with all the roads and trails. You can make up a route as you go instead of having to preload your route.
Jan
8
comment Why (and how) would someone steal only my innertube?
It seems that President Skroob has become more stealthy in his quest for clean air.
Jan
7
comment Is commuting 10 km on an empty stomach harmful?
Anecdotally this seems to fit with my experience. I've recently taken do waking up early and doing 50 minutes on the trainer (Zwift calculates distance at 25 km) in the morning a few days a week. I don't feel low on energy even though I do my morning rides before breakfast.
Dec
16
comment Is it OK for a child's bike to have a radially-laced rear wheel?
@JamesBradbury Appears you are right. It's a little optical illusion I guess when you view it straight on because you're seeing the spokes on both sides of the hub and it looks like spokes are crossing.
Dec
14
comment Is it OK for a child's bike to have a radially-laced rear wheel?
It looks like the spokes aren't completely radial and that there is a single crossing very close to the hub.
Dec
14
comment How far should I be able to bike?
How far and fast you can bike is also going to depend on the bike you ride. That isn't to say you need a really expensive bike, but having a cheap heavy mountain bike with knobby tires is going to be a lot less efficient than riding a decent road bike. What kind of bike are you riding?