Questions tagged [clamp]

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What to do if new hinge clamp has no gap (brompton)

I just installed new hinge clamps on my Brompton, but there's no gap. What should I do? It's been just under 3 years since I last replaced the hinge clamps on my 2015 Brompton M6R. I noticed that ...
Michael Altfield's user avatar
3 votes
2 answers
147 views

Cruiser handlebar rotating because clamp not strong enough

My new cruiser handlebars rotate no matter how much I tighten the clamp on my electric bike. The bike is a Lectric XPremium: https://lectricebikes.com/products/xpremium-black Here is the handlebar: ...
jon_le's user avatar
  • 33
1 vote
0 answers
852 views

What is the appropriate torque for a single bolt saddle clamp

I had to adjust my saddle position and was unsure how tight the saddle clamp should be attached to the tube. Some numbers (22-24?) are engraved on the clamp (first image), but I'm not sure if they ...
conste's user avatar
  • 483
4 votes
1 answer
232 views

Seat rail clamp does not lock in the angle of the saddle

Just put together this bike which is a VB-r-068, i've tightened it to the point where I can't tighten it anymore yet I can still tilt it and what not. I've greased the threads since I thought that ...
user2602766's user avatar
2 votes
2 answers
257 views

Cutting back seatpost binder slot

I've got a tandem with brazed on seatpost binder ears. The slot between them is so narrow that I can't clamp the seatpost with sufficient force: with the two sides bottomed out, the stoker can apply ...
Adam Rice's user avatar
  • 30k
5 votes
1 answer
1k views

Seat post clamp bracket failure - how to repair?

I have a Jamis TAXI beach cruiser needing repair. Part of the bracket that is welded for holding the seat post clamp in place has come loose. The frame says T6 6061 aluminum. I am having trouble ...
Old Grouch's user avatar
4 votes
1 answer
166 views

Saddle / Seat slowly creeps backwards

So, over the course of several months, I notice that my saddle has been creeping backwards on the seat post. Road bike. Fizik seat post (two screws, one manual, one hex head.) Ti rail saddle. I tend ...
Mark Wistrom's user avatar
2 votes
4 answers
1k views

Can I attach a rear cargo rack directly to the seat clamp?

I'd like to install a rear cargo rack on a bike that doesn't have eyelets for the top attachment. Would it be a bad idea to attach the rear rack stays to this seat clamp that's welded onto the frame, ...
chpatrick's user avatar
  • 121
1 vote
1 answer
1k views

How to determine my bike's seat post clamp size?

My mountain bike came with a quick release clamp that reads '34' on its side (embossed or debossed, am forgetting. Reading online there are about 3 sizes for seat post clamps I went with i believe '...
slackexchange's user avatar
2 votes
2 answers
735 views

Zero-gap stem (FSA Afterburner) inverted installation

My question is somewhat related to this one. I apologize in advance for such a long question! And thanks to everyone who manages to get to the end. I've bought an FSA Afterburner 12° stem. On the ...
Gene Pavlovsky's user avatar
9 votes
6 answers
2k views

PRO LT Handlebar Stem asks to tighten top handlebar screws first before bottom screws? Conflicting manual instructions?

I bought this PRO (Shimano) LT handlebar stem. However, I'm having difficulty decoding the instructions in which to tighten the handlebar clamps. The stem itself has this piece of cardboard in between ...
andoofthewoods's user avatar
8 votes
4 answers
1k views

Handlebar slips in quill stem clamp when going over bumps

I bought this new Kalloy quill stem, with Sakae 25.4mm handlebars as pictured below. The handlebars were purchased at an eBay auction. Here's the setup from the side I've tightened the handlebar ...
andoofthewoods's user avatar
5 votes
4 answers
4k views

What saddle rail clamp should I get?

I just got a new supercycle bike that came with everything, including the saddle rail clamp (the part connecting the double-railed saddle to the shaft beneath). After riding about 20km on it, the bike ...
Anthony's user avatar
  • 53
0 votes
1 answer
616 views

Seatpost clamp arrow and too wide saddle rails

I have two questions in one: :) The first would be what direction does this arrow on the seatpost's top clamp indicate? Is it towards the front or rear of the bike? Second would be what should I do if ...
PhantomR's user avatar
  • 241
5 votes
1 answer
836 views

Seat rail clamp spins in the seat post

When I last got on my Specialized Stumpjumper the seat wanted to spin freely. The seat post was firmly clamped in the frame. With further inspection the seat is spinning where the seat clamp goes into ...
Mark Bartholet's user avatar
0 votes
2 answers
2k views

What to use on saddle clamp?

I'm purchasing a new seat-post as my saddle refused to stay at the same angle with my current one; it was a second hand bike (B'Twin Triban 500) with a single bolt clamp. I'm going to switch to a two ...
Noah P's user avatar
  • 137
3 votes
1 answer
855 views

Very confused about the seatpost clamp

I can't figure the seatpost clamp on my bicycle (maybe it's stuck?). I've had it for a few months, it's quite old. I hit a bump in the street and the force lowered the seat but now I can't figure out ...
Cam's user avatar
  • 31
5 votes
1 answer
967 views

Cube stereo 150 race "do not clamp" warning

I have the following warning on my (carbon) CUBE stereo 150 race (2019) : Ultra thinwall tubeset DO NOT CLAMP Currently I clamp my bike like this, and make sure that there is nearly no force ...
Pieter De Bie's user avatar
4 votes
1 answer
847 views

Suggestions for protecting jeans from saddle clamp bolt

I’ve got a bike whose seat post uses the traditional style saddle clamp. It works! The saddle is firmly attached to the bike. Hooray. However. This bike is sort of a “café racer” - I mainly pootle ...
hairboat's user avatar
  • 562
3 votes
1 answer
483 views

The best way to mount a rear rack

I've bought Bontrager Backrack light and I am thinking about different ways to mount it on my road bike. Some details: at the bottom the rack attaches to the quick release screw. the tubes ...
one too many's user avatar
1 vote
2 answers
751 views

Hose Clamp Salsa Watter Bottle Cage to Rigid Fork with No Sliding (Gravel)

Last year, I used some plastic clamps I bought from a LBS to mount two stainless steel Salsa water bottle cages to my rigid fork as shown in this picture: Unfortunately, the plastic clamps wouldn't ...
Shawn Eary's user avatar
2 votes
0 answers
787 views

upgrade traditional saddle clamp (not seat tube clamp)?

I'm currently restoring my folding bike and it has a large diameter (34 mm/1.34 in) seatpost that tapers to the standard 22 mm/0.87 in diameter at the end. The bike currently uses that traditional ...
Gregory Leo's user avatar
  • 1,295
3 votes
1 answer
5k views

How to change the seat clamp on a dropper post?

While trying to tighten the screws on the seat clamp on my wife's bike, I overtightened one of the screws, damaging both the screw and the seat clamp. (I had used a torque wrench and had set it to the ...
nwinkler's user avatar
  • 193
3 votes
2 answers
938 views

Brifter loose even with bolt tight

How to clamp a brifter to the bar more securely if the clamp is already very tight? More detail: After a small crash (no scratches on me, just a few on the bike), one Shimano Ultegra brifter was ...
Sander Heinsalu's user avatar
1 vote
1 answer
208 views

Shimano front-derailleur with 28.6 Clamp

For my new Shimano M780 based gear I need a pull down (or bottom pull) front derailleur with a 28.6mm clamp for a 3x10 without direct mount. All the derailleur I have checked do not have a 28.6mm ...
ruedi's user avatar
  • 779
2 votes
1 answer
3k views

Brake lever clamp too loose for handlebars

I'm trying to attach a new brake lever onto my handlebars, however, the clamp (circular part) of the brake lever that slides onto the handlebars is a bit too loose. I've tried to tighten it but ...
Steven's user avatar
  • 81
0 votes
3 answers
490 views

Brake hanger causing seatpost slippage?

I have an aluminum seatpost in a steel seat tube and I have been noticing some slippage lately. The size of the seatpost and of the seat collar match perfectly the size of the frame. I inspected the ...
Alessandro Cosentino's user avatar
0 votes
2 answers
5k views

Seatpost clamp sizing issues?

I have a carbon bike frame that has a seat post with diameter of 31.6mm and i got a clamp that said 34.9mm but it doesn't fit on the frame (too small). There is no manufacturer details outside of the ...
nolawi's user avatar
  • 1,290
5 votes
3 answers
11k views

Slipping aluminium seatpost in aluminium frame

I've already seen this question: Problems with a slipping seatpost The main difference is that I have an aluminium frameset and a forged alloy seatpost - lightweight clamp. After every couple ...
RoKa's user avatar
  • 417
2 votes
1 answer
467 views

Braze on or what sort of clamp on a Cinelli frame?

I'm seeing a ridiculously good local deal on a Cinelli Experience frame. I think I'll build it up with entry Campagnolo stuff (also seeing a deal). I am mildly confused about the front derailleur ...
rjt_jr's user avatar
  • 199
1 vote
1 answer
1k views

Does a carbon frame need two-bolt seat clamp?

Does a bike with an alloy seat post and a carbon frame need a seat post clamp with two bolts? Most clamps these days seem to be either quick release or single bolt. Is that safe to use with my set up? ...
Matt's user avatar
  • 977
13 votes
7 answers
17k views

Which way should a seat post clamp be oriented?

I heard somewhere (I don't remember where) once that a seat post clamp should be oriented with the gap at the front of the seat tube, opposite of the gap in the top of the seat tube. The logic behind ...
jimchristie's user avatar
  • 11.8k
2 votes
1 answer
878 views

Seat clamp tolerance

Manufacturer specifies a seat clamp/collar size of 36.6mm. I was wondering if a 36.4mm clamp will work? How much tolerance is there with a seat clamp?
AllDayer's user avatar
  • 123
7 votes
3 answers
4k views

Does anyone make a split seat clamp?

I built an 'Urban Mountain Bike' and I sometimes like to take it off drops. Accordingly, I cut the 'nub' that sticks up above the top tube so that the seat can be removed without a scary open pipe ...
Ehryk's user avatar
  • 3,973
2 votes
2 answers
31k views

How do I install a bike seat clamp properly?

I recently moved, and had to take off the seat to my bike while I moved. I was surprised to find when I arrived and settled that I couldn't find the clamp to my bike seat. I managed to find a new bike ...
PearsonArtPhoto's user avatar