Questions tagged [bmx]

BMX is a style of off-road bicycles used for racing and stunt riding. It also refers to the sport itself.

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27
votes
4answers
10k views

What is the foam tube on the top of bmx frame for?

What is the foam tube found on some bmx bikes for? Here's an example: Besides for advertising, I'm guessing its there to save biker's legs when doing tricks, but I could be wrong, because I've seen ...
19
votes
4answers
14k views

Why is BMX gearing so low

I was watching the BMX racing on the 2012 Olympics and the gearing seems incredibly low. About half way down the start ramp they are already going too fast to keep pedalling and they barely seem to be ...
18
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2answers
26k views

What is the name of the part, often seen on BMX bicycles, that allows an additional rider on the back the bike?

What is the name of the part, often seen on BMX bicycles, that allows an additional rider on the back the bike? It appears to be a set of relatively short but thick poles that go on either side of the ...
17
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2answers
7k views

Can riding without a chain damage a bike?

I've been really struggling learning to ride fakie (backwards) on my BMX. Tonight, an idea occurred to me. If I remove the chain from my bike, it'll be a "free coaster," and I won't have to pedal ...
13
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3answers
5k views

What are the advantages of investment casting?

I'm starting to see more and more frames using investment casting for head tubes, drop outs, seat tubes, etc. Such as the new WTP c.r.e.a.m. frame . It looks nice, but I'm suspect on how much more ...
13
votes
3answers
2k views

Truing stands, go big or stay home?

I'm looking to buy a truing stand. Is the Park TS-8 Home good enough? Or should I pay double the price and get the Park TS-2.2 Pro. I have some experience truing wheels, but never on a nice stand. I ...
12
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7answers
15k views

Why are BMX saddles so low?

I've seen a lot of teenagers riding BMX bikes recently. It seems that most if not all of the guys I've seen riding their BMX bikes around the streets, car parks, local parks, etc have a frame that's ...
11
votes
3answers
4k views

How did cyclists get over curbs before BMX era?

There were curbs before 1970s, right? I wonder whether everyone had to dismount or dramatically slow down before curbs until bunny hop and wheel lift became popular, I guess, in 1970s among first ...
10
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3answers
5k views

How does a bike absorb all the energy in landing from a big drop?

There are countless videos showing BMX/freeride/downhill etc. riders jumping and dropping from heights. For the unprofessional spectator, they seem impossible to survive. From the physical point of ...
9
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8answers
2k views

Armor and helmet for ultra-safe commuting (womens size)?

I'm about to start daily bike commuting again after a long hiatus and want to go all out on safety. My fear of an accident is extreme enough that I am looking into regularly wearing body armor and a ...
8
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2answers
1k views

What is it called when you ride a bmx like a unicycle?

I was looking around a bit on YouTube and found a video for a footjam decade... which is pretty cool, in my opinion. However, in this video at 2:44 he rides the bike like a unicycle, straddling the ...
7
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2answers
7k views

What's the performance difference between a front-load and top-load bike stem?

I recently bought a bmx and after doing a few tricks on it, the front-load stem became loose enough for the bars to slide forward (they rotated towards me about the point the bars were connecting at ...
7
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2answers
134 views

Deformed handlebar

My problems with this bar started with it slipping every time I jumped or yanked the bars back. So I had to tighten the screws frequently. Tightening probably caused it to deform and become oval shape ...
7
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1answer
214 views

Effect of BMX bike geometry on manualing

What aspects of the geometry of a BMX bike have an effect on the ease (or lack of ease) with which a manual can be performed? Obviously there is an element of skill to performing a manual, but do ...
6
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2answers
2k views

Why do riders swing the bike out sideways when jumping?

When people do really big jumps on a bicycle or motorcycle, they'll swing the tail of the bike way out to the side once they've taken off. Then it rotates back under them by the time they land. Do ...
6
votes
3answers
43k views

Advantages / disadvantages of freecoaster and cassette hubs

I've been reading a lot over the past few days about BMX, and last night I watched a few videos like this one. I have been seeing the words "freecoaster" and "cassette" around a lot, and I was curious ...
6
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2answers
5k views

Is there much of a difference between flatland and park/street frames?

I am a newbie at biking, and I've been wanting to get into BMX for a few years, and I can now since I actually have some money. Primarily I've been wanting a 20" BMX bike with front and rear brakes ...
6
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2answers
2k views

How can i get the most air from a jump?

I'd like to know what technique/s to use to get both the most height, and the most distance from a dirt jump. The stock image below is the kind of dirt jump I'm referring to.
5
votes
3answers
13k views

What is the bicycle Danny MacAskill uses in his “Way Back Home” video?

I was wondering whether someone could help me identify what is the bicycle Danny MacAskill uses in his video. If it is unable to determine exactly what model he has, could you guys please tell me a ...
5
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2answers
2k views

Can I swap BMX wheels for a larger size?

I am a 5 foot 10 inches 14 year old boy who would like to get into riding a BMX. So if I was to buy a BMX with a certain size wheels, can you swap them for bigger wheels
5
votes
2answers
969 views

What is a good method for constructing dirt jumps?

What is a good method for constructing dirt jumps? Not massive jumps, just something more than a simple mound of dirt for a bit of fun. It's one thing to pile up the dirt, but there seems to be a bit ...
5
votes
3answers
1k views

What BMX bicycle to buy for both urban and rough riding?

This is slightly related to my previous topic about Danny MacAskill's bicycle, but not necessarily bound to it. I'd like to buy a BMX bicycle with the following requirements: I want to use it only ...
5
votes
1answer
12k views

How many freewheel thread sizes are there?

I'm buying new freewheel and noticed that not every freewheel can be screwed onto my hub because they have different thread sizes. For example: I've found the following thread size specifications: ...
5
votes
1answer
310 views

Do Left handed bikes feel different to ride?

Want to buy a BMX bike but they only have left hand drive ones in stock. Does it feel the same as a right hand drive?
5
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1answer
7k views

Can I add gears on a bmx?

Just asking if it is possible. My friend added gears, but won't it damage the look or my cycle?
5
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2answers
459 views

Add front brake and/or improve back brake on 2012 Specialized P.24?

I love the P.24. Sometimes I like to ride it on steep offroad downhills and keep it under control. Currently, my braking strategy is brake and bail if necessary. :) According to http://bmx-bikes....
4
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3answers
3k views

BMX gearing - for road / commuting

I have a 2010 Haro Pro Race, which I bought for commuting and general tomfoolery. I commute on it 2 miles a day, and I want to be able to go faster by changing the current single-speed gearing ratio. ...
4
votes
2answers
2k views

What are some notable differences between a 20'' trial bike and a BMX bike?

I was wondering what are the differences between a small (20'") trial bike and a BMX? Were I to choose one to buy, what should I consider before I make my decision?
4
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1answer
322 views

What is this BMX brand logo?

I bought the a new bike at the local BMX shop but what brand is this logo? I don't have any idea.
4
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2answers
1k views

BunnyHop Soft Landing

I broke my pedal today. I own a bmx. It happened when I landed from an american bunnyhop. Any tips to land softly? (I have even bent the rim.)
4
votes
2answers
7k views

How to take apart this rear BMX hub?

As shown in the photo, what tool do I need to take this rear hub apart? I assume I need a tool which will fit in the 4 notches. The problem I am trying to fix is that if you pedal, the rear cog spins ...
4
votes
1answer
233 views

What year and make BMX do I have?

Front back spring shocks 1970s. I'm sure is this a kawasaki BMX EDIT from duplicate question. After a lot of digging, I found that it is a 1975 Montgomery Ward Silver Fox
4
votes
1answer
212 views

Rear sprocket clicks or points of engagement

I'm a dad learning about BMX racing and I want to know what the difference is between a sprocket which the bike shop says as 90 odd clicks, then starts talking about points of engagement. Does the ...
4
votes
3answers
692 views

How do I fix a loose saddle?

My seat on my bmx turns literally on every bump. If I tap it it'll turn and normally fall off.. The teeth on the seat look to be fairly worn. I don't really want to spend any money as it's just a ...
4
votes
1answer
2k views

Riding bicycle without using seat

I've almost always rode on a BMX, so I've never been sitting while riding because of how low the seat is.Now I've had a chance to try out a more normal bike but I found sitting on the seat to be very ...
4
votes
2answers
802 views

Are front and rear tires on BMX bikes interchangeable?

what is the difference between a front tyre and a back tire and would it matter if they was both front tyres or both back tyres on a BMX bike?
3
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5answers
10k views

Alternative Chain Grease/Lube [duplicate]

Can I use this general-purpose lithium grease on my chain until I can get some Finish Line lube?
3
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2answers
571 views

I bought a used 20 inch bmx bike from bike shop but no one has any idea of the brand

Could someone help me narrow this down? I bought a new-used bike from local bike shop in Sacramento, California, USA. I do not know what brand it is and so were the bike shop. There are no stickers ...
3
votes
1answer
274 views

Every time I move my handle bar left or right the wheel turns in different direction

I crashed my bike and now every time I push on the front wheel a little, or if I turn the handle bar a little hard the wheel turns in the other direction. What could cause this and what can I do ...
3
votes
1answer
98 views

rebuilding/frankenbike query

My son (teenager) has a second-hand Zombie bmx style bike - it's designed for kids, but as far as I can see the frame size is the same as any bmx. It needed a bit of messing around with, I've already ...
3
votes
1answer
328 views

Identify this BMX logo please?

Hi all, having trouble identifying this logo found on my Bmx frame- any ideas? Many thanks More info: It was bought with all high end parts- and was said to be WTP Justice or other WTP frame—...
3
votes
1answer
743 views

BMX V-Brake lever for MTB compatibility

Shimano have this v-brake levers in the product family DXR for BMX. Is there any difference between a BMX brake lever and an MTB one? Are they smaller?
3
votes
4answers
9k views

BMX stem slipping; how to stop?

I recently bought a BMX bike that currently has all stock parts. Recently, with the school and weather, I haven't been able to ride it that much. Anyways, when I picked it up from the shop, the bars ...
3
votes
2answers
377 views

Should my aftermarket frame have a serial number on it?

I was riding a mostly custom WTP Crysis frame which had a serial in case the bike was lost or stolen. I snapped the drop out arms on Sunday and ended up buying a new FBM Hard Way frame. I checked all ...
3
votes
1answer
3k views

Are there any tricks to make “U brake” stronger?

I rebuilt a kids bike. I had the wheelset and calliper/U-brake replaced. Parts that I used are not cheap parts, lets say its more of mid range parts for BMX, normally made of alloy. I made sure the ...
3
votes
2answers
2k views

BMX: Training routine for a beginner?

At the ripe old age of 20, I finally moved to an area with a BMX track, so this summer I'm finally going to be able to follow my life-long dream of racing. Other than spending a lot of time riding ...
3
votes
1answer
37 views

Bmx tire hole. Won't pump up!

So I found a small thorn in my tire. It did make a hole in my tube so I replaced it after trying many solutions. My question: I'm wondering if because there is a hole in the tire but not the tube, why ...
3
votes
1answer
134 views

507 rims on a narrow frame

I bought my son a powerlite Jr cruiser. He would like to but a bigger tire on it. It currently has 520mm 24" wheels with 1" tires. Question is how wide is a 24" 507 bmx rim? I can't find specs ...
3
votes
1answer
485 views

Is it possible to use BMX steerer (stem+handlebars) on fork on folding bicycle?

II want to replace my folding bike's steerer with a BMX setup. I've been told by a bike shop that it is not possible because the steerer tube protrudes 10 cm higher than the frame tube.
3
votes
1answer
798 views

What's this noise? Is it from my crank?

I have recently been riding bmx, racing to be more specific. I ride around my neighborhood a lot when im not at the track and have noticed this loud clanking noise. I didn't know where it was coming ...