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Is it safe to use a mountain bike seat on a bmx bike?

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Is it safe to use a mountain bike seat on a bmx bike?

Old 03-11-17, 01:30 PM
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Is it safe to use a mountain bike seat on a bmx bike?

I got a brand new BMX bike and It's awesome but I have two complaints about it,
  • The seat is too low to be comfortable and is already raised all the way
  • the seat is not well cushioned at all

I want to use the seat from my old mountain bike because the seat can go higher and has some cushioning although I would replace it later because even that one still isn't very well cushioned. Is it safe to use the one from my mountain bike until I can get a new one?
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Old 03-11-17, 01:57 PM
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BMXes aren't meant for seated riding.
BMXes are built for fairly short bursts of standing, high-intensity riding.
If seated riding is what you want to do, you've bought the wrong kind of bike.
How high the saddle willl go isn't decided by the saddle, but by the seat post.
It's possible that your bmx and your MTB has the same diameter seat post, in which case a swap will do a little of what you wish.
Doesn't change the fact that BMXes aren't built for seated riding.
Getting a bike made for seated riding will also make it easier to get comfortable on the bike.
A properly sized bike will make it easier to get comfortable on the saddle too, as it'll let you transfer some weight from your butt to your feet and arms.

Using a MTB saddle on a BMX shouldn't be much risk as such. MTBs are expected to handle some lumps and bumps.
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Old 03-11-17, 04:59 PM
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Originally Posted by dabac
BMXes aren't meant for seated riding.
BMXes are built for fairly short bursts of standing, high-intensity riding.
If seated riding is what you want to do, you've bought the wrong kind of bike.
How high the saddle willl go isn't decided by the saddle, but by the seat post.
It's possible that your bmx and your MTB has the same diameter seat post, in which case a swap will do a little of what you wish.
Doesn't change the fact that BMXes aren't built for seated riding.
Getting a bike made for seated riding will also make it easier to get comfortable on the bike.
A properly sized bike will make it easier to get comfortable on the saddle too, as it'll let you transfer some weight from your butt to your feet and arms.

Using a MTB saddle on a BMX shouldn't be much risk as such. MTBs are expected to handle some lumps and bumps.
Thanks. I wish I had known that before. I think it's pretty obvious that I'm a noob to this. I will probably stick with the current saddle until I can get one that matches the bike better (because I really like customization on my things). I will probably get used to standing while riding because I think it would actually be a good thing. I will probably see if I can at least raise the seat though because I at least want the option to sit when I don't to be standing because I sometimes to just ride and not do anything.
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Old 03-12-17, 02:38 AM
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Originally Posted by Aaronius
I will probably see if I can at least raise the seat though..
Do note that seat posts have to be EXACTLY the right diameter, or you risk damaging the frame.
And they come in 0.2 mm steps.
Also pay attention to the minimum insertion mark. Leave at least that much post in the frame or risk damaging both frame and yourself if the top of the seat tube snaps off.
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Old 03-12-17, 08:23 PM
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Originally Posted by dabac
Do note that seat posts have to be EXACTLY the right diameter, or you risk damaging the frame.
And they come in 0.2 mm steps.
Also pay attention to the minimum insertion mark. Leave at least that much post in the frame or risk damaging both frame and yourself if the top of the seat tube snaps off.
Thanks. I will probably look into a new seat because I don't want to ride standing the entire time because it really ruins the experience. Thank you so much for your help.
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Old 03-13-17, 12:48 AM
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Originally Posted by Aaronius
Thanks. I will probably look into a new seat because I don't want to ride standing the entire time ..:.
Then you WILL have to get another bike.
Unless you're VERY short.
Or get someone to make you a super long seat post.

Stop throwing good money after bad.

A saddle is hugely unlikely to make enough difference.
Most saddles are probably within 1" in height from clamp-to-top.
You might gain 1" more if you go to a sprung, cruiser-style saddle.

Again, BMXes are NOT built for seated riding.

An adult human of average size just won't fit into a position for efficient seated riding on a BMX.

Best you can hope for is a prematurely tiring crooked-leg ride.
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Old 03-13-17, 08:39 AM
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Originally Posted by Aaronius
I got a brand new BMX bike and It's awesome but I have two complaints about it,
  • The seat is too low to be comfortable and is already raised all the way
That's not a function of the saddle itself, but rather the seatpost. Yes, you can get a longer seatpost, but as mentioned above, you'll need to make sure it's exactly the right diameter for your frame. A post that's too big won't fit in the frame's seat tube. A post that's too small will slip, or even worse, you can damage the frame clamping down on it.

Originally Posted by Aaronius
  • the seat is not well cushioned at all
BMX saddles typically aren't cushioned much, if at all.

Originally Posted by Aaronius
I want to use the seat from my old mountain bike... Is it safe to use the one from my mountain bike until I can get a new one?
Yes, it's safe.

And for whatever it's worth... Short seat tubes and low saddles have been in fashion for a while, but that hasn't always been the case. Check out sites with older BMX bikes like bmxmuseum.com and you'll see plenty of bikes from the '70s through the early 2000s whose saddles are mounted at usable heights. (Well, usable for a kid or a teenager. dabac's right about BMX bikes generally being too small for most adults.)
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Old 04-01-17, 10:37 AM
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I run a longer seat post and padded road/mtb saddle on my 26" Specialized P1. It came with a stubby post and molded plastic saddle, as would be expected, but I'm a casual rider and don't get much air at my age, so a more comfortable seat and seat height is how I roll.

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Old 04-01-17, 03:21 PM
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I will probably look into a new BIKE because I don't want to ride standing the entire time because it really ruins the experience.
FI,FY

I too think you got the wrong type bike... doing jumps and tricks bike, and just going for a ride on a bicycle are two separate goals..


I have a 20" wheel Bike Friday.. their purpose that the 20" wheels help achieve is Flying to places to ride ,
with a Bike that fits in a Suitcase..

Whole different application for a 20" wheel .. But, they are not good for X Games Half Pipes and the Skateboard Bowl .

BMX is also the bike you want if you are trying for an Olympic Gold Medal.. Moto Cross with out the motor.

humpy bump course with sharp corners... its an all out sprint for maybe 2 minutes Max.





...

Last edited by fietsbob; 04-01-17 at 03:27 PM.
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Old 04-09-17, 01:25 PM
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Originally Posted by Aaronius
I got a brand new BMX bike and It's awesome but I have two complaints about it,
  • The seat is too low to be comfortable and is already raised all the way
  • the seat is not well cushioned at all

I want to use the seat from my old mountain bike because the seat can go higher and has some cushioning although I would replace it later because even that one still isn't very well cushioned. Is it safe to use the one from my mountain bike until I can get a new one?
Most bmx seatPOSTS are 25.4mm diameter (i.e. 1 inch). Some MTB posts are also, but many others are 27.2, 30.9 and various other sizes.

A lot of "new school" bmx riders ride with their seatpost "slammed" all the way down (and stand all the time).


However, you can put a taller seatpost on a BMX bike:


https://seatpost.wordpress.com/


Who Has the Tallest Seat Post?
Who Has the Tallest Seat Post? - BMXmuseum.com Forums

In old school BMX (like the 80's) it was common to have tall laid-back seatposts. But they also sometimes bent.



Last edited by cmc4130; 04-09-17 at 01:29 PM.
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Old 04-29-17, 02:00 PM
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Originally Posted by Aaronius
I got a brand new BMX bike and It's awesome but I have two complaints about it,
  • The seat is too low to be comfortable and is already raised all the way
  • the seat is not well cushioned at all

I want to use the seat from my old mountain bike because the seat can go higher and has some cushioning although I would replace it later because even that one still isn't very well cushioned. Is it safe to use the one from my mountain bike until I can get a new one?
You're not meant to sit down and ride it, but if it's that much of a concern then you could probably get a cushion for the seat.
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