Tag Info

Hot answers tagged

36

Do you hear a "tick" sound every time you spin the wheel anti-clockwise? that's the freewheel mechanism composed by two small parts called "pawls" and when you spin it on that direction, those pawls turn loosely until they find the "dent" in the inner mechanism (the ratchet body), that's when the "tick" sound happens. When you ride your bike, those two ...


20

Physics! Landing big jumps is all about dissipating the inertia that pesky old gravity has created on your trip back to earth. The better you dissipate that inertia, the better the chance that you wont kill yourself. There are several factors in play here: The Transition of the Landing.The landing is almost always sloped downwards. Combine forward momentum ...


12

They are called Pegs. Pegs are mainly used by BMX riders to help perform various tricks. Flatland trick (standing with all of his weight on one peg, not damaging anything): Grinding a wall on the rear peg (imagine the forces when the rider jumps on the wall, still: no damage to the hub but of course to the peg and the wall): Images from Wikimedia ...


12

While you can certainly wear BMX armour, or possibly even use motorbike armour and wear full face helmets, I would put much more emphasis on changing the way you cycle to reduce the risk from cars. You say cars turn without seeing cyclists- well, you have two options: become more visible. It isn't high fashion, but wear colours and lights, flashing and ...


12

The tracks do not have many long stretches and so cornering and getting ahead of the pack is a lot more important than going fast in the flats. The gearing on a race BMX is higher than on one you will buy out of the store. Most BMX will come with 44:16 gear ratio where racers will use 46-48:16, and I have seen higher. (There are different rear sizes but the ...


11

This is all my guessing based on BMX racing when I was younger, but getting ahead of the pack out of the starting gate is a rather big deal. Once you're behind or right next to someone else, you sometimes have to tap the brakes to avoid them, so there's a huge advantage to this sudden rush of acceleration. This would be a clue as to at least an upper limit ...


9

I think the investment casting of the entire headtube is something particular to BMX bikes. It makes sense, for reasons outlined below. Typical parts of a bicycle which can be investment-cast are: Head lugs Dropouts Seat clusters Bottom bracket shells Seat-stay and chain-stay bridges Fork crowns The easiest way to see why investment casting is ...


8

The TS-2 is what I use and I quite like it. 3 of them are 17 years old and we just purchased a brand new one. Of course everyone likes the older ones ... hah. Anyways, in my opinion you do not NEED to buy the more expensive one. If you are truing 10+ wheels a day, yes you need it (in my opinion). For home mechanic work, the TS-8 is just fine.


8

He rides a prototype trials bike by Inspired Bicycles that will be called 'Skye' when it comes out. Full details on his rig: http://www.inspiredbicycles.com/danny_macaskill_r3.php Inspired sell frames that you can build up to your own specification, useful if you already have a bike that isn't quite up to the job as you can move the parts across and go ...


8

They are called pegs. Designed for tricks, in a BMX park or Flatland style. And they are not meant for another person to stand on. Quite the opposite. It is dangerous to ride a second person in that manner. And you risk damage to the hub of the bike, since the axle can bend or break.


7

According to this site on artisitic cycling they refer to a trick called a "head-tube wheelie" which is probably a good name for it. BMX enthusiasts may have a different name for it, but that's essentially what it is. I was also able to find this other site referring to headtube wheelies. Also, this Youtube video refers to it as a headtube seated wheelie, ...


6

Trial bikes more often have flat handlebars rather than the "tall" bars common on BMX bikes. Trial bikes are more likely to come with "bash guards" around the chainring. BMX bikes may come with somewhat higher gears than trial bikes (but not always). Some trial bikes have no seat or seatpost at all, whereas most or all BMX bikes do have a seat. Trial bikes ...


6

Low seats provide clearance for more acrobatic body movements. This is essential for bunny hops and nearly every other trick which builds off of this skill. If you look at trials bikes they similarly have lots of clearance for the rider over the frame and the saddle. Since speeds are relatively low, and long distance riding is not the goal, pedaling ...


6

what spacing is the is the rear hub? I bought an s2c recently to commute on my track bike, two speed internal geared hub with a gain of 38% but it might be over kill for yourself. Given your setup you have a gearing of about 55inches, if you were to switch out the rear cog to a 12 tooth you would gain 5inches, bring you to around 60 which is considered a ...


6

Is it possible you tightened the pinch bolts before tightening the bolt that runs vertically and holds the top cap down? If you do that, the entire assembly won't be fixed tightly on the vertical and will allow side-to-side play. I did that once and the symptoms were exactly as you describe. To check this, loosen the pinch bolts and the bolt in the top ...


6

Unequivocally, yes, you can - it's just a matter of whether or not it's worth it to you. Without seeing pictures or details: to avoid unnecessary added expense, you'll want to stick with frames that have: The same head tube diameter, so you don't have to replace the headset The same bottom bracket shell width (usually 68mm or 73mm), so you don't have to ...


5

The freewheel allows forward pedalling to lock and drive the bike, but spins freely when reversed. Some BMX style bikes (and kids bikes) have coaster brakes, where if you pedal backwards (well usually they do not actually pedal backwards, just the motion is begun) and it brakes the bike. I remember well locking the back wheel and trying to generate skid ...


5

There should be no difference, other than the quality of the materials and workmanship. One can clamp just as tightly as the other, and both will be apt to produce the same symptoms if the bar is slightly undersized or too flimsy at the mount point. In both cases, if you do have a slightly-undersized bar you want to keep you can grind down the faces of the ...


5

Not ideal. You need something that will penetrate into the chain, and grease will not readily do that. If your chain really needs lubing and you can't get any proper chain oil then plain old engine oil would be a better choice. ("Sewing machine oil"/3-in-One oil would be a second choice, but it's probably a hair too "light".) The real bike maintenance ...


5

the 14t, 15t, etc. is the number of teeth. You currently have a 16 tooth or 16t freewheel. More teeth and the easier to spin, but the slower it spins. Think of teeth on the rear cog as inverse to ease...lower numbers take more power to move; higher numbers take relatively less power. You want to find a good mix that allows you to make it up whatever hills ...


5

It is possible. There are a lot of 20in wheel bikes with gears. There are some problems, though: The frame might need to be opened so that the larger hub can be inserted; There are no derailer hanger in bmx frames, so you'll have to use an adaptor, or a simpler derailer model which is mounted together with the axle; The derailer itself is closer to the ...


4

You mentioned KINETIC ENERGY, which obviously have to go somewhere. Sometimes you have reception, and the bike comes at speed, but sometimes, like in bike trial, the bike lands "flat" on plain concrete. Sometimes, too, freeriders land on flat concrete at speed, and at least the vertical component of the drop's kinetic energy disappears. I would say there ...


4

Rarely do you see people riding 'stock' BMX bikes - the bikes are as individual as the riders. Typically 'mummy' buys a 'stock' BMX and over time it gets more evolved, e.g. a frame with a longer top tube and fancy, bespoke parts. In the UK 'Mongoose' branded bikes are probably the best stocked and even then it is rare to find a bike shop with more than a ...


4

Investment casting has always been used for lugs and dropouts. What happened is that bike manufacturers got away from using lugs about 20 years ago, when NC welders became available that could weld a frame quickly enough to not destroy the temper of high-quality chromoly or aluminum. What you're seeing is really just a return to the old techniques, in a ...


4

The cheaper one will probably work reasonably well, but (crucial point) you'll need to use a dishing tool with it. With reasonably careful adjustment, a TS-2 can substitute for a dishing tool most of the time (i.e., anytime the dishing isn't really critical). You need a dishing tool to adjust the stand, but you only rarely need to use it otherwise.


4

I ride a motorcycle on the freeway (interstate for those back east) and you have to live with the fact that if you are hit by a car there is really nothing you can wear to protect you the way you would like. A helmet will protect your head from the impact of you falling 6 feet to the ground going 20 MPH, but I have yet to see one that will fully protect you ...


4

Frankly, what you want is impossible. A good bicycle helmet provides substantial protection from head-impacts-pavement and head-impacts-vehicle events, but basically only those where the velocities involved are small. The helmet functions by slowing the skull down slowly, avoiding the skull-brain impact which often does the most damage. But, where the ...


4

If you have a modern BMX then the saddle should be super low. If it is not then move it at the very bottom. BMX bikes are very very stiff (100psi tyres, rigid cromo frame, rock solid wheels) so you need to absorb the imact with your feet and upper body. Landing with the rear wheel first (just slightly) helps trigger the feet at the exactly correct time. ...


3

I think that the more expensive one would be worth it in the long run. The home one looks like it's made from a much lighter material so would be more likely to get damaged in the house (moving....). If you end up buying the home one twice because of damage the pro one would have survived then you didn't really save any money. It's also much easier to work ...


3

The advantages of investment casting are: Excellent surface finish High dimensional accuracy Extremely intricate parts are castable Almost any metal can be cast No flash or parting lines



Only top voted, non community-wiki answers of a minimum length are eligible