Is my Tiagra rear derailleur missing a screw?

Asked by: Erika Hernandez

How do you adjust a Tiagra rear derailleur?

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.

What is the purpose of the B screw on rear derailleur?

Most derailleurs have some form of adjustment for the spacing of the guide pulley to the cogs. This spacing is controlled by the B screw, or body-angle screw. This adjustment is check when the chain is on the smallest sprocket up front, and the largest cog in back.

What is the B tension screw?

B-Tension is an adjustment using that mysterious third screw on the back of your rear derailleur. Its proper adjustment is the final step to clean and quiet shifting. It also provides a degree of chain tension assuming: Chain is properly installed and the right length.

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 does the B screw do?

Simply put, the B-Tension screw is there to control the gap between guide pulley (the upper pulley on the derailleur) and the bottom of the cogs.

What does L and H mean 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.

Where is the B tension screw?

Quote from video: The G is the guide pulley it guides our chain across the cassette B is for the B set screw that's the body angle screw that helps position the guide pulley close to the cogs.

Where is B screw on derailleur?

Quote from video: I've been asked what is the B screw. Where is it and what does it do let's take a look when we look at the rear derailleur.

How do you set a Shimano B screw?

Quote from video: And shift the rear derailleur to the biggest cog. I'm gonna start off by backing the B screw all the way out. So I'm gonna do that by turning this counter clockwise.

What size is a derailleur B screw?

M4 x 17.4 mm

The Shimano B-screw for XT RD-M8000 11-speed rear derailleur is an adjusting screw in the size M4 x 17.4 mm.

What is the B gap?

The B Gap is the space, or split, between the offensive guards and offensive tackles on either side of the offensive line. Gaps can be widened by blocks, used as holes or lanes by running backs, and/or targeted by defenders as an entry point to the backfield.

What does the low limit screw on a rear derailleur prevent?

The L-limit stops the derailleur from moving inward (toward the spokes). The limit screw does not make the derailleur move, pulling the inner wire makes the derailleur move. 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.

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.

How do I know if my rear derailleur is worn out?

Worn Derailleur



All derailleurs wear out at some point. Check for wear by pulling laterally on the lower cage. Compare this movement in the linkage of a new derailleur. Sloppy pivot and linkages will produce inconsistent shifting, and the only solution is a new derailleur.

How do I know if my rear derailleur is bent?

Quote from video: When we're trying to shift. Down becomes quite erratic or vice-versa. The key is to look at the rear derailleur we can see it's bent slightly inward.

How do you adjust Tiagra shifters?

Quote from video: And then if you wind it anti-clockwise then the gap opens back up between there and there. So again to close the gap up you just turn it clockwise a few clicks.

How do you use Shimano Tiagra shifters?

Quote from video: So you move the whole shifter across with your left hand and then click down with the small lever on your right hand now there are two exceptions with Shimano gears but firstly it's for di2.

Is tiagra any good?

They are a real highlight both in terms of all-out power and fingertip control. Tiagra offers excellent value for money but 105 is certainly the better groupset and we’d recommend going for it if your funds allow because of the better brakes, the small weight saving and the upgrade to 11-speed.

How do you adjust a Shimano Tiagra front derailleur?

Quote from video: Turn it clockwise now it helps to kind of pull that derailleur out too. So that's not up against the stop and that makes the screw a little bit easier to turn.

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.

How do you adjust a limit screw?

Quote from video: We're going to find the correct setting by purposely making it too tight then we'll back it out slightly. Until it's just right. So grab your screwdriver and tighten the age grew a half turn.