Hot answers tagged

13 votes
Accepted

Are brifters meant to spin/slide on impact, by the choice of a low attachment-bolt torque?

I am not privy to the design philosophies of SRAM, Shimano or any manufacturer and as such my answer is based solely on my own experience. I have crashed on bikes with both Shimano Sora and Dura-Ace ...
newguise's user avatar
  • 146
12 votes

I'm not sure if a torque wrench was used in assembling my carbon bike

He is unlikely to have damaged anything unless he's a complete gorilla. Loosen off any bolts or bolt pairs that you are concerned about, then do them back up to torque.
Noise's user avatar
  • 13.9k
8 votes

How to achieve a 200 Nm tightening torque when installing a freewheel body?

You could measure your lever length and put known weights on the end. Clamp the tool to a vise in a way that the wheel is upright. If your wheel has a 311mm radius you now need to put a 50kg to 65kg ...
Michael's user avatar
  • 26.8k
8 votes
Accepted

How to achieve a 200 Nm tightening torque when installing a freewheel body?

Shimano's torque ratings are best interpreted as a "ballpark" in the extreme high and low ranges. It's only the 2-20Nm range or so where you should respect the precise numerical value. If ...
MaplePanda's user avatar
  • 15.5k
8 votes
Accepted

Is it possible to damage the crankset while removing the pedals?

Torque for a pedal into a crank is ~40 Nm which is quite significant. A traditional 15mm pedal wrench does not provide a lever long enough that would make it easy to go way beyond that by hand. There ...
olliebulle's user avatar
  • 4,141
7 votes

Are brifters meant to spin/slide on impact, by the choice of a low attachment-bolt torque?

Generally you'll find that if you torque them to spec, yes they can still twist readily in a serious impact. I don't know that there's a lot of other evidence in either direction what the intent is ...
Nathan Knutson's user avatar
7 votes

How to determine torque when using quick release?

I’m presuming this is a lever-style axle, similar to a classic QR skewer? The guideline is usually to have the cam begin to fully engage when the lever is sticking out 90° (lever parallel to shaft). ...
MaplePanda's user avatar
  • 15.5k
7 votes
Accepted

Why are electric bikes ranked on torque ratings?

Addressing just the actual question as stated to avoid a 3,000 word essay: With this in mind, how to interpret the advertised torque for a bike with a mid-drive hub, since it's heavily dependant on ...
Affe's user avatar
  • 1,217
7 votes

What is the reference unit of the kgf reading on the Park spoke tension chart?

Kilograms force. It is tension equal to a weight of that many kilograms pulling on the spoke under earth gravity.
Nathan Knutson's user avatar
6 votes

I'm not sure if a torque wrench was used in assembling my carbon bike

I guess you could set your torque wrench to a slightly higher value (e.g. 4.5Nm instead of 4Nm) and see if the bolt moves when you try to turn it. If the bolt moves you know that it hasn’t been ...
Michael's user avatar
  • 26.8k
5 votes

Misaligned Carbon Rails on Brooks C13 Saddle not aligning to Seat Post Clamp

I wrote to Brooks and the Saddle Manufacturer. Brooks responded and said that their carbon saddles have a +/- 1mm deviation in their carbon rails due to the manufacturing process. They would flex into ...
Chasing Lakshmi's user avatar
4 votes

What torque to use for seatpost to saddle clamp?

8Nm is a pretty good generic saddle rail torque. Edit: Oh, that’s not a regular 2-bolt seatpost head. If there’s no torque spec anywhere on it, the necessary torque is likely to be even higher, in the ...
MaplePanda's user avatar
  • 15.5k
4 votes

What torque to use for seatpost to saddle clamp?

This Merida manual on page 130 says 5–7Nm or 6–8Nm, depending on which bolt size the clamping mechanism has. I’m not 100% sure the manual applies to your seat post but I assume going up to 7Nm should ...
Michael's user avatar
  • 26.8k
4 votes

eBike torque sensors: Are hub systems capable of the same ride feel as mid-drive?

I would say better, based on my experience with hub system + torque sensor ebike Koga Miyata Tesla (2008) and testriding newer bikes Tenways (2023) and iMove (2023). Compared to the Qwick mid-drive + ...
Ivana's user avatar
  • 191
4 votes
Accepted

Recommended torque for belt port in rear triangle?

Something is wrong with the installation of the new front sprocket that's causing the belt to ride up like that. That's not normal and you shouldn't ride it. It looks like it's happening in the same ...
Nathan Knutson's user avatar
3 votes

Are brifters meant to spin/slide on impact, by the choice of a low attachment-bolt torque?

IDK about road, but MTB controls are intentionally relatively loose for exactly the reason you describe: "Brake levers and other handlebar controls should not be clamped down too tight, but just ...
JoshuaF's user avatar
  • 261
3 votes
Accepted

What is the maximum force that an average bicycle chain sprocket can withstand?

what is the approximate maximum before teeth start flying off? Bicycle drive train parts - for reference: By "a 44 tooth sprocket" I'm assuming the chainring is meant. This question is not ...
David D's user avatar
  • 21.1k
2 votes

What should the torque of an expander plug in a carbon fork be?

The expander plug has no load to bear. After the steering has been adjusted and the stem clamped you could theoretically remove the top-cap or at least loosen the bolt. In the early stages of ...
Carel's user avatar
  • 8,299
2 votes
Accepted

Tightening torque for a Surly bike

Your frame as a steel frame made from a high quality chromium molybdenum steel is generally quite tolerant of torque. Thus, it's not as important to have precisely the recommended torque as it is for ...
juhist's user avatar
  • 18.5k
2 votes

Torque Specification for Brooks C13 Saddle with Carbon Rails

The torque spec for mounting a carbon railed saddle is not normally different from a metal-railed saddle. However, if the clamp the seatpost uses to attach to the saddle rails is not compatible with ...
Ted Hohl's user avatar
  • 6,162
1 vote

Tightening a compression plug - manufacturer says 9-12 Nm, seems too tight at 6 already

I have rode a bunch of different bikes with different styles of compression plugs and I have learn a few things and sometimes you don't need to torque it down all the way to what the makers says. If ...
dmb's user avatar
  • 818
1 vote

Slipping handle bar, how to torque safely

Not an answer, but I cannot post pictures in the comment... Please be extra careful with incrementing torque. M6 bolt will take a lot, but single-bolt interfaces are more suitable for steel handlebars....
Art Gertner's user avatar
  • 2,487
1 vote
Accepted

Slipping handle bar, how to torque safely

The paint will be contributing to slipperiness in the interface initially, but looking at the wear seems there has also been fretting which has eroded metal. I suspect the inside of the quill stem ...
Criggie's user avatar
  • 123k
1 vote

Torque Specification for Brooks C13 Saddle with Carbon Rails

The torque spec will be determined by your seatpost. Some convert torque to saddle rail clamping force more efficiently than others. For most 2-bolt infinite adjust seatposts, 6-8Nm is a good starting ...
MaplePanda's user avatar
  • 15.5k
1 vote

What is the maximum force that an average bicycle chain sprocket can withstand?

From reality, I think the chain would skip at the rear cog well before it breaks or "the teeth start flying off". This may be at quite a low force if cogs and and chain are worn, even below ...
nightrider's user avatar
  • 7,748
1 vote

I'm not sure if a torque wrench was used in assembling my carbon bike

When in doubt, do them yourself. Use reasonable force to loosen them, and tighten them back in to spec. If a bolt doesn't come out, try using PB Blaster or WD-40, or similar. If that doesn't help, you ...
NinjaJosh5's user avatar
1 vote

What is the reference unit of the kgf reading on the Park spoke tension chart?

1 kilogram or kilogram-force (kg or kgf) = 9.80665 newtons (N) = 35.2739619 ounces (oz) = 1000 grams (g) = 1000000 milligrams (mg) = 2.20462262 pounds (lbs) = 0.157473044 stones (st).
Dennis Wurster's user avatar
1 vote

Torque of the rails or torque of the post?

If the max. torque on the rails is 6Nm then you shouldn't exceed that in no case. The 12-15Nm is the maximum when the clamp is used with metal rails. In your case, start by taking the clamp apart and ...
Carel's user avatar
  • 8,299
1 vote

What should the torque of an expander plug in a carbon fork be?

You use the manufacturer specified torque, which in this case is max 8 Nm but in another component it could be different. That value sounds like more than we are used to in this area of the bike, but ...
Swifty's user avatar
  • 12.8k
1 vote

Hylix carbon fork and compression plug

Some things to consider: The plugs only purpose is to be strong enough to not move up when you tighten the headset down. The steerer will be clamped by the stem, so the stem will reinforce the ...
abdnChap's user avatar
  • 3,334

Only top scored, non community-wiki answers of a minimum length are eligible