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Minimum Insertion...
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 2009-09-10 3:53 PM |
Sensei  Sin City |  Subject: Minimum Insertion...Now that I have your attention. How 'strict' is the minimum insertion line on a seat post? My LBS fitted my new bike and raised the seat about 1/4" HIGHER than the minimum insertion line. After a couple rides, I felt it needed another 1/4" or so. So now I'm riding about 1/2" higher the the recomended insertion (if that makes sense). I'm wondering what I may be risking and if it's prudent to get a slightly longer seat post. I tend to think it's ok, but would like a second opinion. BTW, it's a carbon fiber seat post. |
| 2009-09-10 3:54 PM in reply to: #2399585 |
Master  2426   Central Indiana | Subject: RE: Minimum Insertion... Personally I would not risk it. Sudden seatpost failure could be a REAL bummer!!! |
| 2009-09-10 4:07 PM in reply to: #2399585 |
Veteran 499 El Segundo, CA | Subject: RE: Minimum Insertion... Based on a conversation I had my LBS fitter about the exact same issue, I wouldn't recommend riding with the post that high, especially a carbon fiber post. The results of seatpost failure could be catastrophic... |
| 2009-09-10 4:12 PM in reply to: #2399585 |
Expert 1116 Thornton, CO | Subject: RE: Minimum Insertion... I was given a mountain bike where the previous owner had the seat post too high. Luckily it was an aluminum post and not carbon fiber, but it was bent about 30 degrees because of the added leverage that having it too high put on it. A carbon fiber one on a road bike could easily snap off because of that extra leverage... or it could bend/snap that part of the frame (seat post tube) that sticks above your top tube because the seat post is not far enough in. Don't risk it. |
| 2009-09-10 4:14 PM in reply to: #2399585 |
Master 1641 Seattle, California | Subject: RE: Minimum Insertion... I had a seat post on my mountain bike fail when it was about 3/4 inch above that line. Not fun at all. |
| 2009-09-10 4:23 PM in reply to: #2399585 |
Extreme Veteran 3177 | Subject: RE: Minimum Insertion... definately don't risk it. Those lines are there for a reason! They are not just a suggestion but are for safety. |
| 2009-09-10 4:37 PM in reply to: #2399640 |
Sensei Sin City | Subject: RE: Minimum Insertion... I'm going to stop by the LBS on the way home in 30 minutes and get their take. I'm hoping they will swap out for free, or just make me pay the difference on a new seat post. In reality, I bet it's ok. However, I would sleep easier/worry less if I knew for sure it was ok. |
| 2009-09-10 4:47 PM in reply to: #2399585 |
Elite 3091 Spokane, WA | Subject: RE: Minimum Insertion... I'll chime in with another vote for don't risk it. It's not just the seatpost failure you have to worry about. I have a buddy who had a frame failure on a mountain bike and they wouldn't honor the frame warranty because he exceeded the minimum insertion line on the seatpost. |
| 2009-09-10 6:02 PM in reply to: #2399585 |
Champion 5782 Northridge, California | Subject: RE: Minimum Insertion... Yeah...I could probably use another 1/4" of height on my saddle, but I'm right at the minimum insertion line now and just don't want to chance it. I'll do that with the safety line for the elbow pad brackets on my clip-on aerobars, but the thought of a carbon seatpost failure while riding scares me, frankly. |
| 2009-09-10 6:11 PM in reply to: #2399585 |
| Subject: RE: Minimum Insertion... And, no offense, but you are a big guy. Seat post failures can be catastrophic. No way I'd chance that...... |
| 2009-09-10 7:32 PM in reply to: #2399585 |
Member 86 Columbia, MD | Subject: RE: Minimum Insertion... I had an aluminum post bend with less than 1/4" above the line. I'd guess a lot depends on the post; I'd feel better running a couple mm above with a thomson than a cheap kalloy (and you couldn't pay me to ride with a carbon post past extension). Honestly, I'd be asking if the new bike fits in the first place though. If you need better than a CM extra post, that sounds like the frame is likely too small. Also, you paid for a fitting, and are going to second guess it raising your seat past what the recommend? Heck, you paid for a fitting and they let you leave with your post above min insertion? To me that screams "find another shop" Edited by fausto 2009-09-10 7:33 PM |
| 2009-09-10 8:25 PM in reply to: #2399888 |
Sensei Sin City | Subject: RE: Minimum Insertion... Official word from the LBS is that the post is 'ok' as long as it extends below the bottom weld of the top tube. It does. I have 3.5 of the 4 inches still in the frame. |
| 2009-09-11 12:26 AM in reply to: #2399953 |
Pro 5892 , New Hampshire | Subject: RE: Minimum Insertion... Smart move Aikidoman. Never ride a seatpost that are exposed above minimum insertion. Hopefully it will never fail if you do, but the injuries if you it does fail is not worth the $100 or so that a new seatpost will put you back. Thompson makes some really nice seatposts! Edited by audiojan 2009-09-11 12:26 AM |
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