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Questions tagged [adjustment-screw]

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Brake lever suddenly stuck due to an overtightened screw - what went wrong?

The issue I was biking when suddenly it felt like I was driving in the sand and not on a regular road. Upon inspection, I noticed that the brake was stuck on the 'closed' position, closing the disc ...
FunkyBezel's user avatar
8 votes
2 answers
2k views

What does this screw do (on my bicycle)?

I was trying to adjust the "H" and "L" screws on my rear derailleur to as to adjust the gears better to a Wahoo Kickr I just set up. However I accidentally gave a turn to another, ...
Cerulean's user avatar
  • 1,061
7 votes
1 answer
1k views

The pulley is not close enough to the largest sprocket even when b-screw is all the way out

I have a new bike with Shimano Ultegra di2 12sp and 11-34 cassette. Following Shimano's installation instruction, with largest sprocket and small chain ring, I cannot move the upper pulley close ...
Ning Wang's user avatar
  • 249
4 votes
1 answer
688 views

Stripped reach adjustment screw on GRX RX 815 levers

In trying to decrease the brake lever reach on my GRX Di2 shifters, I seem to have stripped the 2mm hex screws. They are located in an awkward position on the top of the shifters: https://si.shimano....
Rankeya's user avatar
  • 141
9 votes
2 answers
2k views

Which limit screw is which?

I had to replace my front derailleur on my mtb. Now I just need to adjust it however the limit screws are not marked. Does anyone know if the L limit screw is closest to the frame? Or is that one the ...
Alison's user avatar
  • 1,173
3 votes
2 answers
3k views

Impossible to properly adjust rear derailleur indexing

I can't adjust the rear derailleur to shift properly. Sometimes it hesitates to downshift from 1st to 2nd and when it shifts to 2nd you can hear a faint clanking sound, like the chain is trying to ...
Stelios Liakopoulos's user avatar
1 vote
1 answer
452 views

Purpose of this screw on my mountain bike's (BCA 29SC) rear dropout/derailleur and how to fix?

so recently I have been having problems with my bike: the wheels tended to slip out of the dropout and rub against the frame of the bike. However, I had found a way to fix (reorient) the wheel ...
Legend ile's user avatar
2 votes
1 answer
2k views

Rear dropout with adjustments screws of a single speed bicycle

I have got a single speed bicycle (Pure Fix Original Series) and I need to remove the rear wheel to the replace the punctured tube. The rear dropout has adjustment screws (I am not sure if this is the ...
Cm7F7Bb's user avatar
  • 155
4 votes
1 answer
422 views

Skipping bolts on seatpost , please help?

Couple weeks back I bought this aluminium single-bolt seatpost . Now, just 20 days later, the nut that tightens the the mechanism to fasten the saddle rails to the seatpost is skipping around and not ...
An Ant's user avatar
  • 322
4 votes
1 answer
2k views

Shimano Acera hits spokes. Which screw to turn?

I have a Shimano Acera that hits the spokes in first gear (largest rear sprocket.) I found three screws on the derailleur Which one should I turn, in which direction? The bike (Specialized Sirius 2.0) ...
Bram's user avatar
  • 327
3 votes
0 answers
87 views

Can't find a "friction screw" for a friction shifting system

I recently broke one of the two speed levers ajuster (friction screw) that adjust the pressure between the levers and the cable. It's made in plastic as shown in the picture below. I would like to ...
Gabriel's user avatar
  • 31
1 vote
0 answers
89 views

Campagnolo rear mech screw type

My limit screws' heads have gone rusty, I want to replace them for looks and to make sure they are easy to adjust on a ride. I would love hex rather than Philips heads! Does anyone know the type of ...
Richie's user avatar
  • 11
9 votes
3 answers
10k views

Handle bar rotates on its own. Can’t screw the screw all the way down

I have a second hand Peugeot road bike. I noticed the handlebar was rotating on its own, unscrewed the screw, straightened the handlebar and found out it won’t screw back. Later I found out the screw ...
Mikey Hasson's user avatar
1 vote
1 answer
1k views

Replace / Repair Diamondback bike stem

I have a Diamondback Edgewood 26" hybrid bike. I believe it is a 2008 model. Mostly it's a great bike and it certainly serves my needs right now. However, the stem has become loose so the ...
dgo's user avatar
  • 113
1 vote
1 answer
673 views

B-screw adjustment in a derailleur with a spring in the upper pivot (Shimano RD-5800)

I have tried to follow ParkTool adjustment tips for the B-screw of the rear derailleur (other company's tips are similar) , but I fail to detect the condition "the upper pulley rubs the largest cog". ...
gstorto's user avatar
  • 343
1 vote
1 answer
160 views

Rear derailleur low limit adjustment changes under load

I have a hybrid bike, which, when I am sat on the bike, shifts and remains into the largest cog on the rear cassette with no problems. However, if I take my weight off the bike, then when I start ...
texasflood's user avatar
5 votes
1 answer
391 views

Can you have too many in line barrel adjusters?

Just replacing the shifters on my bike. It had STI shifters and I'm putting thumb shifters on, the shifters have built in barrel adjusters. The bike also came with barrel adjusters on the down tube, ...
Rich's user avatar
  • 423
6 votes
1 answer
27k views

Misadjusted B-screw: symptoms?

What are the typical symptoms of incorrectly adjusted B-screw in the rear derailleur? How does it manifest itself when shifting? Obviously, if the cage pulley interferes with the cog, the problem is ...
AnT stands with Russia's user avatar
1 vote
1 answer
2k views

derailleur P-screw/B-screw does absolutely nothing

I know dérailleur adjustments are frustrating, but this is the 4th day i'm working on this... i stop working just before the rage kicks in and leave everything to continue another day :) The problem ...
gcb's user avatar
  • 1,465
18 votes
3 answers
99k views

Tightening torque: 5Nm, 40Nm... how do I tell?

I have wonderful new manuals everywhere, of brakes, wheels... In these manuals I see "tighten up to 5Nm", "tighten up to 40Nm". There must probably be tools with such measurements on them, but I don'...
Antoine's user avatar
  • 665
2 votes
1 answer
421 views

Where is the Tricross Sora front derailleur barrel adjuster

It's supposed to be on the outer casing (according to the shimano manual) but the Tricross has internal cable routing. Anyone know where it is? I really don't see it but I might be being a bit simple....
user1170304's user avatar
6 votes
1 answer
8k views

Rear dropout adjustment screws on fixed-gear conversion

I have a Surly Cross-check that I absolutely love and adore to pieces. I've also converted it from a geared bike to a fixie and am wondering if I still need the adjustment screws (see picture, in case ...
Scott's user avatar
  • 1,394