THANK YOU for showing the BACK of the derailleur and the action the B screw takes against the spring tension! Many videos show adjusting the B screw, but no one ever shows what is mechanically happening on the back side. Thank you!!
who cares about taking the tension off to adjust it if he never showed us "how" to adjust it, he never showed us a methodology like he did on the H and L screws on other videos
Thanks Calvin. This helped a lot. I completed my first build this year, a Velo Orange Passhunter. It’s set up with downtube friction shifters. It shifted ok but not perfect. Now that I made a B screw adjustment with your help everything is working perfectly.
Dear Calvin, thanks for your very efficient video, and your useful advice. It will also help me, to pay more attention before acting on any part of my bike!
as far as i understand it, the screw pushes against the frame and therefore pushes the derailleur back. This creates the gap between guide pully and rear sprocket. The screw always does this, you cant really have it not touch the frame. But depending on how much the screw is screwed in or out, it pushes the derailleur more or less away from the sprocket. The grinding comment is supposed to tell you to pull the derailleur back by hand when you turn the screw, to release tension on the screw while you turn it. As soon as you let go of the derailleur, it will snap back and the screw will touch the frame again
@@Aditya-wg3lp had issues with shifting into the highest gear, tried adjusting the tension screws on the rear mech but nothing worked until I saw this vid and realised there was a B screw, adjusted that and it finally shifted properly
You will use the B screw to set the distance from the large sprocket to the top pulley when in the smallest front sprocket and largest rear sprocket. You want the pulley to be close but not touching. Some newer systems are very particular on the b screw adjustment and actually have a jig to tell you when it is set correctly. For most others as close as practical is perfectly adequate.
It depends on the system you are running. A good place to start would be about 4mm away from the largest cog. Some systems are more sensitive to this than others.
Hi I Have adjusted the B screw all the way in and its still hitting . I can't adjust it enough to get a space . The chain is the correct length and all the parts are factory parts . Will the T adjustment on the pulley have any affect on setting of the B screw ? Is it possible there is to much tension on the T adjustment and its not allowing the spring that controls the B setting ? I have the sora derailleur and it doesn't have a T adjustment screw so now what ? Is the spring that is inside the housing that bolts the derailleur onto the frame of the bike where the B adjust is made just to weak and its no longer pulling back and its allowing the hanger wheel to rest on the gears ? Would you make a video that shows how to fix this bumping of the gears once you have adjusted it as far as you can and its still bumping ?
Chain length or component compatibility would be what we would check first. Factory parts can be spec'd improperly. If your chain length, component compatability, install, and your B tension are setup correctly this should not happen and there could be a defective component. There is no other setting on the derailleur to correct it.
I overloosened mine and somehow all the tension has been removed from the chain and now when I try to shift the gear it no longer works. I also can no longer tighten the screw. I think somehow the cable became unhoused at the front. Is this possible?
It would have been helpful had you demonstrated or illustrated how the B screw affects the alignment of the tension pully with the sprocket and how to determine when the alignment is correct.
Tech Tuesdays offer great tips. For how to videos our repair help content is awesome. Follow this link for an in depth view of how to adjust a b-limit screw. ua-cam.com/video/UkZxPIZ1ngY/v-deo.html
hello, can you show us a video of how to remove the B bolt off the Sram X01 derailleur? Is it possible to use any Sram B bolt to replace the broken one?
We will look at doing that. Those are tricky. All the bolts are the same thread standard, but that doesn't necessarily mean they are interchangeable, due to design differences in shoulder diameter and length. - Calvin
Well noted Calvin. thanks for the feedback. I've downloaded the service guide from Sram to the specific derailleur, X01 11Speed, and they show some drawings of how to do it, it seems to be easy, but I've not tried it yet. It is quite common to break the Bbolt and I believe it would be interesting if you guys made a video about how to replace it. Many people just throw their derailleur away (advised by the shop's mechanics) and buy a new one because they don't know it could be replaced. these derailleurs are really expensive! It would be really nice of you to do so.
got a weird problem on my 2016 trek slash 8, with sram GX derailleur, Seems to keep snapping the notch which the 'b-bolt' part pushes into on the rear hanger. It completely shears it off, causing obviously no tension there, so the jockey wheels slam into the cassette and the chain goes really slack. Any ideas ?
The notch or stop breaks off of the derailleur hanger? Impressive. Have you checked chain length? It could be that your chain is slightly short. Have you noticed if it is in a certain gear that it happens?
@@parktool here is a link to the pinkbike fourm where i have asked the same question, with pictures of the broken part... www.pinkbike.com/forum/listcomments/?threadid=209769 The chain if anything seems a bit long, as i get quite a bit of chain slap, and do not have any trouble selecting gears
Interesting. Could you post a picture to that forum of how you have the derailleur set up on the bike and also what it all looks like in the largest cog? There should not be that much force on the system. When pedaling, the derailleur tension is un effected and pedaling should not do this.
If it is shifting well, leave it alone. If the upper pulley rubs against the largest sprocket, tighten it. If there is a big gap between the pulley and largest sprocket, say more than 6 or 8mm, loosen the B.
+Md Alamin First, it is always good to check with the manufacturer. If your sora is a nine-speed, and your 5700 shifter is a 10 speed, then no, it will not work well.
hey!!!! what the heck?? thumbs down today. You showed us the b screw but never told us the methodology of how to adjust it properly like you did the High and low adjustment in other videos. You always have a method or an approach to adjust tension and screws, why don't you show us the same methodology when you set the B screw? thanks.
ok,... you forgot the most important part... HOW DO WE ADJUST THE SCREW B, you told us which screw to turn, but you did NOT tell us how much or how little to turn it, till we see what? any references ? the general one you gave with your passive hand waving its too vague.
And boom, that poem at the end just wrapped up this simple yet incredibly helpful video beautifully.
Shakespeare in gears
Hahaa who would’ve thought I’d find that here 😂😂
THANK YOU for showing the BACK of the derailleur and the action the B screw takes against the spring tension! Many videos show adjusting the B screw, but no one ever shows what is mechanically happening on the back side. Thank you!!
who cares about taking the tension off to adjust it if he never showed us "how" to adjust it, he never showed us a methodology like he did on the H and L screws on other videos
best bike tech video i have seen on many levels
Thank you, Calvin, for the clear explanation of how the B screw works, and for the rhymes at 1:17.
No engineering BS talk, just pure mechanical knowledge being shown here. Quick and to the point.
The mechanic from park tool is spittin rhymes man I love this guy
Thanks Calvin. This helped a lot. I completed my first build this year, a Velo Orange Passhunter. It’s set up with downtube friction shifters. It shifted ok but not perfect. Now that I made a B screw adjustment with your help everything is working perfectly.
These vids are so useful. Rear mechs used to be very scary things until I discovered uncle Calvin!
These videos are amazingly well done and easy to understand !
so good, now I have understood the B-screw principle!
Best regards from Switzerland
Dear Calvin, thanks for your very efficient video, and your useful advice. It will also help me, to pay more attention before acting on any part of my bike!
I love these videos. Thank you for posting the guidance and for making the learning process fun.
2 words
Poetic
Mechanic
What a beautiful poem, brought a tear to my eye
These videos are the best and very well explained and demonstrated..thanks Calvin!!
Low key in love with this man
Couldn’t have imagined a better explanation!
Very important for smooth running, I'm going up to a 12-30T cassette, so this is a big need to know.Thanks.
Excellent tutorials. Very helpful, ty
Quick to the point, to the point, no faking
that outro poem ima say that poem to my wife when I get married .. so beautiful.
Well done park tool
and it's tuesday and I am watching!
love this channel
Calvin when u drpping an Album?
Calvin got bars
Thank you!
Calvin Jones with those “BARS”
He maintains the bicycle like a poem
0:51 I didn't get that part (which is most important), screw must be grinding against the frame ?
as far as i understand it, the screw pushes against the frame and therefore pushes the derailleur back. This creates the gap between guide pully and rear sprocket. The screw always does this, you cant really have it not touch the frame. But depending on how much the screw is screwed in or out, it pushes the derailleur more or less away from the sprocket.
The grinding comment is supposed to tell you to pull the derailleur back by hand when you turn the screw, to release tension on the screw while you turn it. As soon as you let go of the derailleur, it will snap back and the screw will touch the frame again
Only video I've seen that mentions the B Screw, solved my gear shifting problems!
Friendly Xeno what kind of problem did you have?
@@Aditya-wg3lp had issues with shifting into the highest gear, tried adjusting the tension screws on the rear mech but nothing worked until I saw this vid and realised there was a B screw, adjusted that and it finally shifted properly
@@friendlyxeno6352 yeah i had the same problems, thats why i asked
@@Aditya-wg3lp sorry about the delay haha, never got the notification for it, but yeah, adjusting the b screw sorted my gear shifting issues
@@friendlyxeno6352 lol its all good
Calvin got some rhymes
“Don’t be a hack pull it back” “That’s your Tuesday tip for today” everything is rhyming 👌🏼
Yeah, but how do I know when I have it set correctly? In other words, what am I trying to look for while adjusting the B Screw?
You will use the B screw to set the distance from the large sprocket to the top pulley when in the smallest front sprocket and largest rear sprocket. You want the pulley to be close but not touching. Some newer systems are very particular on the b screw adjustment and actually have a jig to tell you when it is set correctly. For most others as close as practical is perfectly adequate.
(1:02) how do u fix the b screw hole that is loose?
What a boss💪
Is there a recommended distance between large cog and guide pulley? Thanks.
It depends on the system you are running. A good place to start would be about 4mm away from the largest cog. Some systems are more sensitive to this than others.
Park Tool Thank you.
Awseme, thank you Park tool
Wow, just wow!!!
Should this be done before or after the h, l and indexing adjustments
This should be done before other adjustments as it will have a big impact on where those should be set.
@@parktool Thank you very much for your quick answer. Your videos have helped me a lot! Keep up the good work!
Poetry in motion !
Hi I Have adjusted the B screw all the way in and its still hitting . I can't adjust it enough to get a space . The chain is the correct length and all the parts are factory parts . Will the T adjustment on the pulley have any affect on setting of the B screw ? Is it possible there is to much tension on the T adjustment and its not allowing the spring that controls the B setting ? I have the sora derailleur and it doesn't have a T adjustment screw so now what ? Is the spring that is inside the housing that bolts the derailleur onto the frame of the bike where the B adjust is made just to weak and its no longer pulling back and its allowing the hanger wheel to rest on the gears ? Would you make a video that shows how to fix this bumping of the gears once you have adjusted it as far as you can and its still bumping ?
Chain length or component compatibility would be what we would check first. Factory parts can be spec'd improperly. If your chain length, component compatability, install, and your B tension are setup correctly this should not happen and there could be a defective component. There is no other setting on the derailleur to correct it.
I overloosened mine and somehow all the tension has been removed from the chain and now when I try to shift the gear it no longer works. I also can no longer tighten the screw. I think somehow the cable became unhoused at the front. Is this possible?
Sir my b tension screw have come out form my derailleur what to do sir help me 🙏🙏🙏🙏
Idk what to do with my chain and rd. When i'm climbing at highest up to 3rd gear, the chain was slipping to my cogs. What should I do?
so...where's the T screw??
Clutch if you have one
T means tension.
You are fighting the B (screw) against the T (tension of it directly against the frame) so pull the derailleur back to help the B screw.
You're a poet, i didnt know it.
It would have been helpful had you demonstrated or illustrated how the B screw affects the alignment of the tension pully with the sprocket and how to determine when the alignment is correct.
Tech Tuesdays offer great tips. For how to videos our repair help content is awesome. Follow this link for an in depth view of how to adjust a b-limit screw. ua-cam.com/video/UkZxPIZ1ngY/v-deo.html
absolute bars
hello, can you show us a video of how to remove the B bolt off the Sram X01 derailleur? Is it possible to use any Sram B bolt to replace the broken one?
We will look at doing that. Those are tricky. All the bolts are the same thread standard, but that doesn't necessarily mean they are interchangeable, due to design differences in shoulder diameter and length. - Calvin
Well noted Calvin. thanks for the feedback. I've downloaded the service guide from Sram to the specific derailleur, X01 11Speed, and they show some drawings of how to do it, it seems to be easy, but I've not tried it yet. It is quite common to break the Bbolt and I believe it would be interesting if you guys made a video about how to replace it. Many people just throw their derailleur away (advised by the shop's mechanics) and buy a new one because they don't know it could be replaced. these derailleurs are really expensive! It would be really nice of you to do so.
WTF why wouldnt you mention where it should B??
Can a chain thats too long prevent me from getting my B tension right?
Yes it can. And commonly will.
@@parktool what about too loose?
I wish I used the tip to relieve the stress from the b screw when adjusting before I broke my extra long b screw in the derailleur D:
Calvin didn't know it, but he's turned into a poet.
got a weird problem on my 2016 trek slash 8, with sram GX derailleur, Seems to keep snapping the notch which the 'b-bolt' part pushes into on the rear hanger. It completely shears it off, causing obviously no tension there, so the jockey wheels slam into the cassette and the chain goes really slack. Any ideas ?
The notch or stop breaks off of the derailleur hanger? Impressive. Have you checked chain length? It could be that your chain is slightly short. Have you noticed if it is in a certain gear that it happens?
@@parktool here is a link to the pinkbike fourm where i have asked the same question, with pictures of the broken part...
www.pinkbike.com/forum/listcomments/?threadid=209769
The chain if anything seems a bit long, as i get quite a bit of chain slap, and do not have any trouble selecting gears
Interesting. Could you post a picture to that forum of how you have the derailleur set up on the bike and also what it all looks like in the largest cog? There should not be that much force on the system. When pedaling, the derailleur tension is un effected and pedaling should not do this.
Don't fight the B... got iit. Thanks!
B is for beer?
So How do you adjust the Flippin B screw ? Does anyone out there know how to adjust it ?
Great tip but I can't figure this one out, it seems.
I dont have a b screw its a vintage derailluer what to do now pls help
If it is shifting well, leave it alone. If the upper pulley rubs against the largest sprocket, tighten it. If there is a big gap between the pulley and largest sprocket, say more than 6 or 8mm, loosen the B.
Hi hello, Can i use shimano 105 5700 sti shifter with sora 3500 derailleur.
+Md Alamin First, it is always good to check with the manufacturer. If your sora is a nine-speed, and your 5700 shifter is a 10 speed, then no, it will not work well.
Thank u
what is the distance recommendation on shadow plus between the Guide pulley and the cog?
5mm
That should be a poem
Epic
My B screw doesn't work if I tightening the screw there's nothing happen
LOL beautiful *claps*
cool uncle that's,,,,,, 😯
Don´t be a hack pull the derailleur back words to live by
thank you i dont understand
hey!!!! what the heck?? thumbs down today. You showed us the b screw but never told us the methodology of how to adjust it properly like you did the High and low adjustment in other videos. You always have a method or an approach to adjust tension and screws, why don't you show us the same methodology when you set the B screw? thanks.
Ridiculous - So, no mention of what the correct setting actually is !
When adjusting the b-screw, you'll want the G pulley as close to the cogs as possible without causing any noise during pedaling.
Not helpful. Please show the desired distance between chain and the guide pulley.
it varies but you should be good at 5mm-6mm.
Noice.
ok,... you forgot the most important part... HOW DO WE ADJUST THE SCREW B, you told us which screw to turn, but you did NOT tell us how much or how little to turn it, till we see what? any references ? the general one you gave with your passive hand waving its too vague.
I wish I'd seen this video before I completely f'd the thread on my b screw
screws have letters, very well, finally i heard something new
I'd appreciate less poetry, and a more clearly visual presentation of where the G pulley is supposed to exactly be for proper adjustment