shelbyfv

While OP is waiting for the correct size seatpost to arrive, maybe take the time to properly adjust bars and brake levers.

bboy314

Good point. I’d say they should lower the stem back to a safe level too, but that’s just the kind of unhelpful judgement that gives the forum a bad name.

elcyc

I mean, like, WTH is one suppozed to be measurin' ?

elcyc

WTH do "brake levers" have to do with the OP seatpost topic? ... other than another off-topic post because the attention-craver is bored to tears and/or wants is increase his BF post count. Yes?

bboy314

Probably the seatpost, or even the frame since that’s the whole point of this thread/exercise in futility.

Steel Charlie

Are there prizes for post count?

DangerousDanR

Firstly, let me state here and now for the record that seat posts are a near press fit in the frame. What you are suggesting is that you should allow .6mm of motion of the seat post in the frame. multiply that the lever arm and you will have a saddle that wobbles a very noticeable amount. Doing this would cause fairly rapid fatigue of the frame.

The forums you mention give potentially dangerous solutions without mentioning the issues. I gave you several very good solutions:
1) heat/chill to make it a press fit. This is the only potentially safe way to make that post fit.
2) remove material from the frame. this will reduce the strength of the frame. Will it be strong enough? Beats me.
3) remove material from the post. How thick is the metal on that post? Will it be strong enough? Beats me.
4) obtain the correct diameter seat post. It may not be available because your frame uses a deprecated diameter seat post. Accept this fact and move on.

What you wanted was for someone to tell you that taking 0.3 mm off the wall thickness of the seat post will be OK. Maybe it will. Maybe it won't. I have had a seat post break under me. You don't want to experience that.

Someone else has pointed out that this is a very poorly designed item. Steel springs provide almost zero damping. The amount of energy dissipated as heat in the spring will be minimal. The energy transfered to your body will be almost the same; you will just be bouncing more.

It will yield a variable distance between the pedals and the saddle, which is not a good thing.

By the way... Amazon gave you clear directions. RTFM!

Wileyrat

Seriously? Again, if you’re not measuring the inside diameter of your seatpost, you’re just guessing, and it seems you guessed wrong.

FWIW, I have a Team Fuji that is around the same vintage as your Miyata, I checked yesterday, and your 27.2 seatpost definitely would not fit.

Atlas Shrugged

Perhaps this forum should have a portal into one of the more popular AI engines. Here is the response generated for your post.

When dealing with a seat post that doesn't fit in your bicycle, here’s what you need to measure and check:

1. **Seat Post Diameter**: Measure the outer diameter of your seat post. This is typically done using a caliper. The diameter is usually marked on the seat post itself, but measuring it can confirm the exact size.

2. **Seat Tube Inner Diameter**: Measure the inner diameter of your seat tube, where the seat post inserts. This also should be done using a caliper to ensure precision.

3. **Length of the Seat Post**: Ensure the length of the seat post is appropriate for your bike and riding style. While this doesn't affect the fit in the tube, it's important for adjusting the seat height properly.

4. **Check for Roundness**: Verify that both the seat post and the seat tube are round and not deformed. Any dents or out-of-roundness can cause fitting issues.

5. **Insertion Depth**: Check that the seat post can be inserted to the minimum insertion depth marked on the post. This is important for safety and structural integrity.

**Steps to Take If There's a Problem:**

1. **Clean the Seat Tube**: Dirt and debris inside the seat tube can cause fitting problems. Clean it thoroughly.

2. **Check for Damage**: Look for any damage or deformities in the seat tube or seat post.

3. **Correct Seat Post Size**: Ensure you have the correct size seat post. If it’s too large or small, you may need a different size.

4. **Use a Shim**: If the seat post is too small for the seat tube, a shim can be used to make it fit correctly.

5. **Seek Professional Help**: If you're still having trouble, take your bike to a professional bike shop. They can provide precise measurements and solutions.

By measuring the seat post and seat tube accurately and checking for any issues, you can determine why the seat post doesn't fit and take the necessary steps to resolve the problem.

The best part is if you don’t agree with the response you can argue infinitely a not waist others time.

unterhausen

OP has received good advice and seems to have chosen to ignore it. The thread is just going to deteriorate from here. I'm closing for moderator review.