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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28 votes
4 answers
12k 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 ...
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  • 607
21 votes
4 answers
18k 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 ...
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19 votes
2 answers
35k 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 ...
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17 votes
2 answers
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 ...
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  • 305
14 votes
10 answers
3k 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 ...
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  • 149
14 votes
3 answers
6k 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 ...
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  • 885
13 votes
3 answers
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 ...
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  • 885
12 votes
7 answers
19k 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 ...
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  • 906
11 votes
3 answers
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 ...
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  • 299
10 votes
3 answers
6k 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 ...
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  • 487
9 votes
4 answers
4k views

How old is too old for aggressive cycling?

Downhill, freeride, dirt jumping, BMX. Am I too old for complete experience of these styles at 28 ? Have no prior experience, but think to jump in. I did extensive reading on this topic, forums, blogs ...
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8 votes
1 answer
2k views

Can anyone tell me what bike logo this is? Cant seem to find it

Help!!! Please and thank you.!
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  • 89
8 votes
1 answer
890 views

Can I put pegs on any bike?

I'm back, again. I'm buying a BMX bike, its a 2021 Kink Gap XL. I wanna put pegs on it, because it doesn't have pegs, and a lot of the tricks I wanna learn require pegs. So, if I buy this bike, will I ...
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8 votes
2 answers
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 ...
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8 votes
2 answers
8k 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 ...
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7 votes
2 answers
373 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 ...
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  • 111
7 votes
1 answer
236 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 ...
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  • 355
6 votes
2 answers
5k 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 ...
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  • 5,570
6 votes
2 answers
4k 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
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6 votes
1 answer
20k 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: ...
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  • 99
6 votes
3 answers
49k 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 ...
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6 votes
2 answers
6k 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 ...
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6 votes
2 answers
3k 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.
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  • 355
5 votes
2 answers
957 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.
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5 votes
3 answers
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 ...
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  • 1,119
5 votes
3 answers
248 views

Need help with BMX Frame logo stamping

I need help with this logo, I cannot find any clear answers... The frame is aluminum, the rear dropouts have this logo stamped and the bottom bracket does have two sets of serial numbers.
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5 votes
2 answers
1k 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 ...
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  • 355
5 votes
3 answers
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 ...
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  • 1,119
5 votes
1 answer
2k 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?
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5 votes
2 answers
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.)
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5 votes
1 answer
10k 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?
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  • 71
5 votes
2 answers
493 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....
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  • 357
4 votes
2 answers
1k 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 ...
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  • 41
4 votes
2 answers
3k 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?
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  • 1,119
4 votes
1 answer
193 views

What does this emblem mean?

Does anyone know ow what kind of bike this is all I have is the emblem stamped
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4 votes
1 answer
1k 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?
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  • 183
4 votes
4 answers
4k 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. ...
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  • 143
4 votes
2 answers
534 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 ...
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4 votes
1 answer
4k 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 ...
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  • 174
4 votes
2 answers
8k 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 ...
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  • 805
4 votes
1 answer
337 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
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4 votes
1 answer
313 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 ...
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  • 41
4 votes
3 answers
2k 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 ...
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  • 327
4 votes
1 answer
3k 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 ...
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  • 41
4 votes
2 answers
953 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?
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  • 41
3 votes
5 answers
14k 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?
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  • 31
3 votes
3 answers
7k views

My stem keeps moving side to side even thought I tighten it

I just got a new Demolition Stem.I tight it with all my force And It keeps slipping side to side Like it doesnt match with the fork lined up And whenever I check it its fine but after a while it is ...
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  • 39
3 votes
1 answer
528 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 ...
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3 votes
3 answers
265 views

Choosing a gear ratio on 20" vs 24" BMX that creates the same "feel"

I am trying to create a formula to get the right gearing on my two BMX bikes. On my 24" Cruiser I have a 40/16, 40 tooth front and 16 tooth rear cog. The chart says that is a 60, and 188.5 roll-...
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3 votes
1 answer
2k 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—...
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