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Adjusting the saddle height everyday, bad idea??

Old 07-15-20, 08:40 PM
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cubewheels
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Adjusting the saddle height everyday, bad idea??

I have a sister who wants to borrow my bike for short errands. She is shorter than me and also wants a very low saddle height for convenience.

I'll put a paint mark on the saddle post so I can quickly adjust it to my fit.

But is it okay to adjust the saddle height everyday?? I'm worried that the part of the frame where the seat post clamp is located would crack from repeated tightening and loosening.
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Old 07-15-20, 08:45 PM
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Good worry as any clamp that gets frequent adjusting and isn't designed to handle the many loosenings and retightenings will stretch and slowly loose the ability to tighten at some point. Note that the "bikes" designed to handle this often have either "overdesigned" clamps or have through pins (like some spinner bikes have).

So the best advise is to only tighten the binder bolt as much as needed to retain seat height and no more each time. This way whatever the design can handle will last as long as possible. Andy
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Old 07-16-20, 03:30 AM
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Whoa, I didn't realize that the clamp can stretch! Maybe I shouldn't tighten too much as you said. My clamp came with quick release bolt btw and I only tighten it with my thumb.

Another thing is that the seat post is a little bit tighter than a snug fit to the frame. Even if the clamp bolt is removed, the seatpost will take some force and twisting to move it up or down and completely no play. Not worried about that and maybe it's a good thing to minimize stress to the frame.

I probably wouldn't mind replacing the clamp every couple of months, as long as the frame wouldn't mind these daily adjustments.
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Old 07-16-20, 08:14 AM
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I think (he said without any supporting evidence) that many mountain bikes, at least of a certain vintage, were designed and built for frequent seat height changes. If your seatpost has a quick release, it's likely one of these and can be readjusted as you propose without problems.
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Old 07-16-20, 09:31 AM
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Brompton and Dahon bikes depend on pushing the seat post down as part of their folding procedure
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Old 07-16-20, 01:19 PM
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Sounds like an excuse to buy another bike. It can be your bike and you just use it occasionally. Or it could be all her's. Either way a win win.

Even with a quick clamp there is still wear and tear, just slower about it. Some better than others for certain.
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Old 07-16-20, 01:54 PM
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The clamp is a cheap disposable part. I don't see the problem whatsoever. It's not like a thru axle where the axle threads into the actual frame.
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Old 07-16-20, 02:31 PM
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Originally Posted by RowdyTI View Post
The clamp is a cheap disposable part. I don't see the problem whatsoever. It's not like a thru axle where the axle threads into the actual frame.
On some of my steel bikes, the steel beneath the clamp would grow a little every time you clamped it really hard. Eventually the notch cut in the back of the seat tube to let the clamp squeeze it against the seat post would meet at the top and prevent the clamp from putting any squeeze to hold the seat post.

I such case all I had to do was just file or remove some material from the notch area to give it a gap again.
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Old 07-16-20, 02:48 PM
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A good brother would find a beater or similar for his sister
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Old 07-16-20, 02:52 PM
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You say it's a quick release. Post a photo so we can see what you are talking about. Most of these replies have been for straight clamps with just a bolt. A good quick release in a sturdy setup can be opened and closed many times.
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Old 07-17-20, 10:45 AM
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Originally Posted by squirtdad View Post
A good brother would find a beater or similar for his sister
A better brother would buy a dropper seat post. While this may be an expensive overkill, it will allow you to safely lower and raise your seat height.

John
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Old 07-17-20, 11:01 AM
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The mountain bikes with quick release clamps are/were the functional equivalent of dropper posts, so it should be fine.

Make sure the clamp is at the rear if the slot in the seat tube is at the rear.

Make sure the clamp is at the front if the slot in the seat tube is at the front.
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Old 07-17-20, 11:02 AM
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The best brother would buy her a bike in a smaller frame size
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Old 07-17-20, 06:02 PM
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Originally Posted by 79pmooney View Post
You say it's a quick release. Post a photo so we can see what you are talking about. Most of these replies have been for straight clamps with just a bolt. A good quick release in a sturdy setup can be opened and closed many times.
Here we go. The seat tube is actually installed backwards by mistake (it's a very cheap $100 bike anyway) And the top tube is behind the clamp in this picture.

I've put Lithium EP complex grease in the seat post as precaution. Additional worry is the seatpost is a little tight fit in the seat tube. It takes some effort and twisting to move it up and down the tube with the clamp fully loose. Might accelerate wear during constant adjustments.

I made a stick of the right length to put against the seatpost so I can adjust it to my fit quickly. Sister only cares about being able to stand while sitting on the saddle (casual riding for errands only).

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Old 07-17-20, 06:10 PM
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What's backwards again?
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Old 07-17-20, 06:26 PM
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Originally Posted by squirtdad View Post
A good brother would find a beater or similar for his sister
Not really necessary. I only use the bike for 1 hour of "torture training" and some quick errands and it's all hers. I'd like to spend a lot more hours but I'm also caregiver for mom. Sister can use the bike for a lot more hours if she would!
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Old 07-17-20, 06:27 PM
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Originally Posted by trailangel View Post
What's backwards again?
The slot in the seat tube for the seatpost clamp is facing back . Never had a bike with the seat tube slot facing backwards.
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Old 07-17-20, 06:30 PM
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Originally Posted by cubewheels View Post
Here we go. The seat tube is actually installed backwards by mistake (it's a very cheap $100 bike anyway) And the top tube is behind the clamp in this picture.

I've put Lithium EP complex grease in the seat post as precaution. Additional worry is the seatpost is a little tight fit in the seat tube. It takes some effort and twisting to move it up and down the tube with the clamp fully loose. Might accelerate wear during constant adjustments.

I made a stick of the right length to put against the seatpost so I can adjust it to my fit quickly. Sister only cares about being able to stand while sitting on the saddle (casual riding for errands only).

You have no worry whatsoever. That can go up and down for the next 5 years every day, and you'll get where you need to go, and you're a good brother and a good sister for sharing a bike. If anything happens, it will be that the tight seatpost will slide up and down a little more easily. It's a $100 bike. It's doing its job. It doesn't need anything. Seatposts are made to be raised and lowered. You're not stretching anything. You might be wearing off a little rough metal that's binding things right now. Keep it up and enjoy your family. Safe riding and good health to you both.
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Old 07-17-20, 06:47 PM
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Seat tube binder slots are traditionally found on the backside of the ST. It is slots on the front side that are less (as in far less) common. The debate of which is better might be another thread

The OP didn't mention ant specific binder clamp and thus I, as a pro, have to assume the worst cast when dishing out advise. That is the binder in a nonreplaceable item, as has been the standard on millions of bikes over many decades.

I agree that the replaceable collars do change the equation.

cubewheels- I suggest that you see if a LBS can hone the tube's ID to reduce the scratching of the post. Andy
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Old 07-17-20, 07:29 PM
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Originally Posted by Andrew R Stewart View Post
The OP didn't mention ant specific binder clamp and thus I, as a pro, have to assume the worst cast when dishing out advise. That is the binder in a nonreplaceable item, as has been the standard on millions of bikes over many decades.
I think I can use an angle grinder much much later on to increase the slot width when it has stretched significantly.

cubewheels- I suggest that you see if a LBS can hone the tube's ID to reduce the scratching of the post. Andy
Excellent call, thanks! It never crossed my mind until you mentioned it. Tube and post is both aluminum though which I hope would reduce wear to a minimum with grease.

Going to the LBS if they can get it removed.
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Old 07-17-20, 07:33 PM
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Originally Posted by ljsense View Post
You have no worry whatsoever. That can go up and down for the next 5 years every day, and you'll get where you need to go, and you're a good brother and a good sister for sharing a bike. If anything happens, it will be that the tight seatpost will slide up and down a little more easily. It's a $100 bike. It's doing its job. It doesn't need anything. Seatposts are made to be raised and lowered. You're not stretching anything. You might be wearing off a little rough metal that's binding things right now. Keep it up and enjoy your family. Safe riding and good health to you both.
Thanks man! Appreciate the peace of mind and well wishes! Yea hopefully the quick release prevents over tightening!
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Old 07-17-20, 07:36 PM
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IT is not so much the slot's width as it is measured right at the contact with the post that is what get's stretched. It's the width of slot between the binder's ears that closes up first. With a replaceable collar that has it's own ears the solution is generally not to use a non reversible method, like a grinder/cutter, but to replace the now stretched collar. Do no harm is the first priority in any service.

Now if one were to replace the very snug post with a smaller diameter one then the seat tube's slot would indeed close up. Andy
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Old 07-17-20, 10:07 PM
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Originally Posted by Andrew R Stewart View Post
Now if one were to replace the very snug post with a smaller diameter one then the seat tube's slot would indeed close up. Andy
Definitely not an option! I think a more loose tube would increase material fatigue from more flexing. Tube's perfect for now (just a teensy bit worried about rub due to tightness) but seems like a non-issue based on replies.
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Old 07-18-20, 08:04 AM
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One can combine a seat post sizing shim, of the appropriate OD, and a smaller seat post.. fitting in that larger seat tube..
Brompton has a plastic one on its folding bikes,, there are also machined aluminum ones..
I have 3 bikes so outfitted.. all of them the company fitted a sleeve to use a 27.2 seat post,
one of them I had a 2nd one with a 27.2 OD, 25.0 ID, to re use the seat post ..
.. for the screwed & Glued AlAn I used to own, sold, & kept the seatpost.. so has 2 sleeves inside of each other..






...
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