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Questions tagged [seattube]

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6 votes
4 answers
2k views

Cracked Carbon Seat Tube

I was riding when my seat tube cracked as I rode over a hump. Are there any possible fixes for this like epoxy, sanding, or something? I'm losing sleep over this.
holocris's user avatar
6 votes
2 answers
949 views

Seatpost/saddle moving down when riding

I noticed that that my saddle started moving down when riding (maybe 1cm/hour). When cleaning the inside of the seattube I noticed that the part at the height of the clamp became smooth, compared to ...
Rеnаud's user avatar
  • 21k
4 votes
2 answers
794 views

What is the meaning of multiple front derailleur clamp measurements?

I am putting a front derailleur on a Surly Long Haul Trucker frame. I know from the LHT specs that the front derailleur clamp diameter should be 28.6mm. However, for the Shimano Deore front derailleur ...
Christopher C.'s user avatar
4 votes
1 answer
169 views

Seat Tube Size?

I was just wondering if there was anyone on here who knows or could help me figure out my seat tube size. My bike is a 2008 Kona Stinky Deluxe. I don't have any calipers for checking either, and I've ...
Keyin Liu's user avatar
  • 231
3 votes
1 answer
57 views

Trimmed seatpost gets stuck without bottoming out

I have a new-to-me bike that I can comfortably standover, but I just cannot get the seat down as low as I need. Thinking I'd just need to trim the seatpost, I took it to my bike shop and they did it ...
wfc0003's user avatar
  • 31
2 votes
1 answer
4k views

Can a dropper post be added to a Giant bicycle with D-Fuse?

I just bought a Giant Revolt that comes with a D-Fuse seat post. I really hate this mechanism, I have to remove the seat frequently to store the bike. I was wondering if it's possible to change to a ...
Gonzalo Garcia's user avatar
2 votes
1 answer
214 views

Chip in carbon seat tube?

I pulled out the seatpost on my Giant TCR and notice something like a chip in the seat tube, are defects like this normal?
Luigi's user avatar
  • 21
1 vote
1 answer
80 views

How to adapt a tube-mounted clamped accessory for a larger diameter tube?

I bought an Abus bike lock which came with a tube mount called the Abus EaZy KF. The issue is that this mount only supports up to 36 mm diameter tube but the smallest tube on my bicycle is 38 mm. I ...
Daniel's user avatar
  • 163
0 votes
0 answers
63 views

Carbon seatpost stuck due to damaged grub screw

I have an Orbea Orca 2024 with Di2 and the grub screw for adjusting seat height has potential thread damage and it won't come out. The bike mechanic explained that the reason the grub screw went so ...
Lalit Chilka's user avatar
0 votes
2 answers
471 views

How do I fix, repair, or replaace a bent seat post?

Awhile back, the seat post on my bicycle bent over. The seat post is a hollow metal tube located just underneathe the bike seat or bicycle saddle. How do you fix this problem?
Samuel Muldoon's user avatar