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Bottom Bracket Woes
This is a bit long, apologies but I have no other way to explain it,
and hopefully someone can help me out with this vexing issue. Finally got a Matt Chester frame (love it), which has a BB issue I need to address. The original owner had a Schlumpf crank installed which required chamfering the BB shell. In doing so, the BB threads were cross threaded. Although they were chased, the threads are still not perfect, and the Phil BB I have in there creaks pretty badly because the thread interface is somewhat loose after the chasing, plus it's a 68mm BB which doesn't use all the threads in the Phil lockring anyway, and chamfering it takes away another 1.5mm or so of threads in the BB. I've tried loctite, teflon tape, etc, with no joy. There was also a Shimano BB in there when I got it with plenty of thread engagement and teflon tape, that creaked also. The guy I got the frame from also had a Mavic 616 BB (the one that uses the 45 degree chamfer and lockrings/external threads on the BB to secure it) he included. It has a 114mm spindle, which sounded good since I use a 113mm spindle with Sugino XD (110bcd triple) cranks and it gives me a perfect chainline (52mm, I believe) with the Phil KISS- Off double fixed hubs I use. Problem is that the BB is ISO, and the cranks are JIS, so can't use that combo. Question 1: Is there another, ISO, crank (TA or Campy triple, maybe, or...?) that will give the same chainline with a 114mm spindle, using the outer ring? Question 2: If not, what spindle length would it take, with what crank, to get the 52mm chainline using the outer ring position? Anyway, if you've made it this far I appreciate it, and hope you can help. Thanks, Rod |
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#2
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Bottom Bracket Woes
Rod wrote:
This is a bit long, apologies but I have no other way to explain it, and hopefully someone can help me out with this vexing issue. Finally got a Matt Chester frame (love it), which has a BB issue I need to address. The original owner had a Schlumpf crank installed which required chamfering the BB shell. In doing so, the BB threads were cross threaded. Although they were chased, the threads are still not perfect, and the Phil BB I have in there creaks pretty badly because the thread interface is somewhat loose after the chasing, plus it's a 68mm BB which doesn't use all the threads in the Phil lockring anyway, and chamfering it takes away another 1.5mm or so of threads in the BB. I've tried loctite, teflon tape, etc, with no joy. There was also a Shimano BB in there when I got it with plenty of thread engagement and teflon tape, that creaked also. The guy I got the frame from also had a Mavic 616 BB (the one that uses the 45 degree chamfer and lockrings/external threads on the BB to secure it) he included. It has a 114mm spindle, which sounded good since I use a 113mm spindle with Sugino XD (110bcd triple) cranks and it gives me a perfect chainline (52mm, I believe) with the Phil KISS- Off double fixed hubs I use. Problem is that the BB is ISO, and the cranks are JIS, so can't use that combo. Sheldon has an article on this topic: http://www.sheldonbrown.com/bbtaper.html According to that, your 114mm ISO spindle would act like a 110.5mm spindle with a JIS crank. I'm not familiar with your other components (i.e. the Phil hubs), but maybe you could adjust away a mm or two, leaving a very good chainline. -- Dave dvt at psu dot edu |
#3
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Bottom Bracket Woes
if red does not work then try one of these, remembering surface prep
is important and that one metal surface is to be ferrous but not ferrous stainless. if neither surface is ferrous then ask locktite for a compound carrying ferrous material: http://www.loctite.com/int_henkel/lo...d=130&layout=1 |
#4
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Bottom Bracket Woes
On May 29, 7:00 pm, " wrote:
if red does not work then try one of these, remembering surface prep is important and that one metal surface is to be ferrous but not ferrous stainless. if neither surface is ferrous then ask locktite for a compound carrying ferrous material: http://www.loctite.com/int_henkel/lo...&pageid=130&la... hyperlink failure! search the above list for "retaining" and click |
#5
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Bottom Bracket Woes
On May 29, 7:05 pm, " wrote:
On May 29, 7:00 pm, " wrote: if red does not work then try one of these, remembering surface prep is important and that one metal surface is to be ferrous but not ferrous stainless. if neither surface is ferrous then ask locktite for a compound carrying ferrous material: http://www.loctite.com/int_henkel/lo...&pageid=130&la... hyperlink failure! search the above list for "retaining" and click sorry about this being piecemeal but I'm cooking dinner- is the spindle tapered? a primary service problem containing the words "creak creak" occurs at the tapered spindle and crank with the crank loosening: all creaking noises go to the loose crank first./ grab the end, pull and push it inboard/outboard. see: 'beer can shim datakoll' in tech archives |
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