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All About DriveTrain Discuss tech help/info on: Rear/Front Deraileur, Cranks
Bottom Bracket, Chains, Sprockets and Shifters.

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  #1  
Old 02-06-2013, 05:05 PM
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Question Bottom bracket adjustment

Hi tanong ko lang kung pwede ba ma adjust ang bottom bracket ng mtb ko, medyo maiksi kasi yun sa drive side nya kaya hindi na pumapasok si granny gear ko. kahit anung tono ko ayaw talaga nya pumasok.
Pinacheck ko na sa LBS sabe palitan ko daw ng BB kasi maiksi yun aken, nagtataka lang ako kasi date ok naman ang drive train ko nag simula lang tung problem nang minsan mabuhol ang chain at crank ko.
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  #2  
Old 02-06-2013, 05:27 PM
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Default Re: Bottom bracket adjustment

pede naman sir. check mo lang placing ng spacers sa drive and non-drive side. tanggal or kabit ng spacers to adjust. adjust as necessary to have that nice chain line.

this is assuming that you have the correct bb size. 68/73mm ba yung bb nyo?
  #3  
Old 02-06-2013, 05:42 PM
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Default Re: Bottom bracket adjustment

or...baka naman napihit ang FD sa pagkakabuhol ng chain. try to remove the cable and loosen the L screw (did i get the correct?). see how low the FD cage can go.
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Old 02-06-2013, 06:08 PM
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Default Re: Bottom bracket adjustment

kung dating ok yan at sinabi sayo ng LBS na napuntahan mo eh palitan na yan, sila ang palitan mo, punta ka nalang sa ibang LBS...
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Old 02-08-2013, 03:45 PM
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Default Re: Bottom bracket adjustment

inadjust ko yun FD down to halos dumikit na sya sa rear tire kaso wala paren ayaw paren ni granny...
  #6  
Old 02-08-2013, 05:38 PM
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Default Re: Bottom bracket adjustment

pano mo po inadjust yung FD? did you turn it? or did you loosen the cable? was the L screw turned?
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Old 05-21-2013, 09:53 PM
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Default Re: Bottom bracket adjustment

sir yung bb tinangal sa bike ay 122 mm ang haba ok lang ba gumamit ng 118 mm lenght na bb ? nakabili ako ng alivio crank sabi ng lbs maiksi daw ang bb na binigay sa akin (d ko nakuha lenght )yun ang nakalagay sa bike ko .pag nasa big chainring natatangal yung chain. nakakuha yung inutusan ko na 118 mm na bb oklang ba yung 118mm sa dating 122mm . ?
  #8  
Old 05-21-2013, 11:21 PM
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Default Re: Bottom bracket adjustment

sure po ba na 122mm? or kasama/spline sa sukat?

parang lapad naman ng bb na yon. ano po yung/frame?

anyway, kung bitin, baka di pumasok ng husto yung crank arms sa splines.
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  #9  
Old 05-22-2013, 07:13 AM
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Default Re: Bottom bracket adjustment

122mm? 'di ba't 68 or 72mm lang ang bb shell?

nahuhulog paano ang chain? palabas ba (papunta sa pedals) or paloob (papunta sa midring)? baka naman spacer lang ang problema.
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  #10  
Old 05-22-2013, 03:40 PM
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Default Re: Bottom bracket adjustment

Mukhang kasama spline sa sukat! Anong frame po gamit nyo?
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Old 05-22-2013, 09:30 PM
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Smile Re: Bottom bracket adjustment

ty sir sa reply yung old bb 73x122mm axle bc 1.37x 24t.yung naman bago bili =68 bc1.37x24, 118.para sir maibalik ko kung mali . ty

giant revel 1 sir yung frame. @sir anthrax natatangal yung chain papunta sa pedals . yung nakalagay maiksi daw. kaya napabili ako ng bago kaso mali pa ata.



sir yung taas yung luma

Last edited by galva; 05-22-2013 at 10:15 PM. Reason: add picture
  #12  
Old 05-23-2013, 01:03 PM
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Default Re: Bottom bracket adjustment

papunta sa pedals? baka naman adjustment lang ng FD yung problem. or baka spacer lang ang kailangan for the bb.
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  #13  
Old 05-23-2013, 07:03 PM
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Default Re: Bottom bracket adjustment

@ sir antrax .pinatono ko na sir sa lbs pagnasa malaki na chain ring at nasa maliit na cogs natatangal yung cadena papunta sa pedals. sir paano at san nakalagay yung spacer ?baka yun ang kulang para lumabas yung cranks palabas .
  #14  
Old 05-23-2013, 09:35 PM
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Default Re: Bottom bracket adjustment

sa hollowtech bb yung spacers na pedeng ilagay/adjust sa drive or non-drive side - kung san mas maganda ang chain line.

in your case, kelangan saktong pasok yung thread ng bb according to the frame. yung dati ko na sealed cartridge bb, walang provision for spacers for square taper bb. sakto lang talaga sa frame.

medyo unfortunate din, kasi puro 68mm ang labas ng suntour na sealed cartridge bb ngayon.

check ko rin yung dati ko. kung 73mm, kahit ibigay ko na lang sa inyo, sir galva.

naku sir, sorry. unfortunate na naman. hehe.

73mm yung shell kaya lang octalink yata hanap nyo. tapered square yung sa akin.

[IMG][/IMG]

dalawa din po yung octalink, v1 saka v2.
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  #15  
Old 05-24-2013, 10:45 PM
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Default Re: Bottom bracket adjustment

ghetto remedyo.. you can actually put a 1mm or 2mm spacer (those used in outboard BBs) on the drive side. ang effect nyan, lalabas ng konti yung drive side spline mo and lulubog ng konti yung Non Drive Side (notice mo na 1 side lang ng BB ang may parang "harang"). problem lang is on some cranks di na maisagad yung NDS crank mo (since mas maiksi nga ang spline/axle mo ngayon). In my experience, naipasok pa naman ng maayos ang NDS crank. Depends din siguro sa frame and crank. Worth trying.

about the natatangal na chain... parang di dapat. kahit di ganun ka straight ang chainline mo sa big-small gearing. case in point- meron mga naka 1x9 na hindi gumagamit ng chainguide. and on the average ride (as long as hindi naman sobrang baragan), di natatangal ang chain kahit saang cog nakalagay. And your FD actually works both ways- to derail the chain para lumipat... and to keep it in place (that's why some people use old FD's pag walang budget for chainguide.) I think anthrax is right, may mali lang sa position ng FD mo. Try ka ibang mechanic--- yung hindi puro pabili ang solution :)
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Old 05-26-2013, 01:46 PM
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Default Re: Bottom bracket adjustment

@sysdev. ty pre sa pagtulong.@sir stab dinala ko sa lbs d na daw puede lagyan ng spacer tatama na daw yung crank (yung walang ring )sa lagayan ng bb . napabili tuloy ng bago bb 120 mm ang haba.
  #17  
Old 06-27-2013, 01:23 AM
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Default Re: Bottom bracket adjustment

OT question po pero about sa bottom bracket naman din.
Ano-ano po ba ang sizing ng bottom bracket? If ever na magupgrade ako ng bb sa Alivio crankset ano po yung maganda? thank you na rin po.
  #18  
Old 06-27-2013, 09:59 AM
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Default Re: Bottom bracket adjustment

eto sir, sa database ni saint sheldon brown: http://sheldonbrown.com/bbsize.html


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