Shimano Acera hits spokes. Which screw to turn?

Asked by: Jonathan Nice

How do I adjust my Shimano acera?

Quote from video: The derailleur down into the small cog. Once we do that we're going to turn the barrel adjuster all the way in so that we have room to adjust it. After adjusting the cable position at the anchor.

Which way do limit screws turn?

Turning the screw clockwise, moves the derailleur limit to the left, turning it counter clockwise, moves it to the right. In the end, the sprocket and the upper pulley should be aligned perfectly.

What does the low limit screw do?

L-Limit screw adjustment



The L-screw allows the pulley wheels to shift the chain to the innermost sprocket and yet not shift off the sprocket into the spokes. 1 Shift bike to middle chainring (or smaller ring of double chainring bikes) and to second-to-innermost rear sprocket.

How do you set a limit B screw?

Quote from video: If the B screw is too loose it will Rumble as we ride. If the B screw is too tight this gap will be very large and the shifting will be sloppy to set the screw we must turn it.

How do you adjust a Shimano Acera front derailleur?

Quote from video: We will start by adjusting the L script shift the front derailleur to the smallest ring. If the limit screws are not marked pick one and turn it while watching the cage.

What is the on/off switch on my Shimano derailleur?

SHADOW PLUS rear derailleurs feature an on/off switch used to adjust spring tension, which optimizes chain retention over bumpy terrain. This keeps the chain stable for smooth, seamless shifting so you can focus on the ride without noisy distractions from a clanking chain.

What does the B screw do on a Shimano derailleur?

The B-gap or B-tension screw is located at the very back of your derailleur. It pushes against a tab on your frame’s derailleur hanger, allowing you to adjust the distance between your rear derailleur’s top pulley and the cassette.

Which way do you turn a barrel adjuster?

To do this, turn the barrel adjuster (see below) counter clockwise. If the chain is not shifting well from the largest to the smallest chainring, then the inner wire tension needs to be lowered. To do this, turn the barrel adjuster clockwise.

How do you adjust an H screw?

First turn the H-limit screw count-clockwise a few turns. Pedal and see if it makes the shift outward. If it still does not shift outward, turn the barrel adjuster on the derailleur body clockwise a few rotations. Pedal to see if it shifts.

What are the 3 screws on a derailleur?

On most derailleurs there are three limit screws: the upper limit, Lower limit, and B-limit. The upper limit screw sets the maximum distance the derailleur can shift in high gears. The lower limit screw sets the maximum distance the derailleur can shift in the lower gears.

What is the H and L on a bike?

You need to adjust the high (H) and low (L) limit screws on the derailleur. Viewed from behind the bike, the H screw limits how far the derailleur can move to the right, while the L screw limits how far the derailleur can move to the left.

Should you adjust the front or rear derailleur first?

In a nutshell, adjust the front derailleur first, then the rear. Show activity on this post. If the derailers just need minor tweaking (they are basically in adjustment but are “not quite right”) then you adjust the one that is obviously wrong, check the overall adjustment again, then again adjust what needs adjusting.

What do the screws on a front derailleur do?

Like a rear derailleur, the front derailleur will have limit screws marked ‘H’ and ‘L’. These screws are used to stop the cage at the extreme ends of travel. The end of the limit screw strikes the linkage, and this stops cage travel. The ‘L’ screws determines the amount of innermost cage travel.

Which way do you turn a barrel adjuster front derailleur?

Turn the barrel adjuster clockwise (a quarter turn at a time) to move the derailleur cage inward, away from the chain surface. Turn it the counterclockwise direction to move the cage outward.

How do I adjust my rear derailleur?

Quote from video: Set to increase this gap tighten the B screw. To decrease the gap loosen the B screw. If you made significant changes to the B screw double check the indexing adjustment.

How do you set Shimano gears?

Quote from video: This clockwise on the limit screw you can see the derailleur moving inboard an anti-clockwise. It moves outboard. If it's too far inboard you'll never get that a small gear or the high gear.

How do you adjust a Shimano Altus rear derailleur?

If your derailleur hesitates when shifting into bigger cogs (lower gears), increase cable tension by turning the Barrel Adjuster counterclockwise. If your derailleur hesitates when shifting into smaller cogs (higher gears), decrease cable tension by turning the Barrel Adjuster clockwise.

How do you adjust a Shimano 7 speed rear derailleur?

Quote from video: All on its own. So now whilst the cable is still loose. We need to get the height. Set screw which is this one they're labeled this one has an l4 low this one has an h4.

How do I adjust my rear derailleur?

Shift into a small ring on the cassette. With your thumb, push the body of the derailleur toward the large cog. The top pulley should align with the largest cog in the cassette. If the pulley moves past the largest cog toward the spokes, turn the limit screw marked “L” clockwise to tighten.

What does the B screw do?

The B-screw controls the body angle of the derailleur. It pulls the pulleys away from the sprockets, so you don’t rub against them. If you set it in the largest rear cog (as you should), when you’re adequately clear, you don’t have rubbing.

What do the screws on a derailleur do?

Derailleurs are fitted with limit screws that stop the derailleur from moving too far inward or too far outward. If you look closely as the derailleur moves, you can see the limit screws stopping the derailleur at each end of it’s travel.