On Nov 6, 7:30 pm, John Thompson <j...@vector.os2.dhs.org> wrote:
> >[OP wrote:]
> >>That said, looking at the specs of the ISO BB it looks like they're > >>1.375 x 24 TPI, which comes to 34.9, or possibly close enough to 35... > >>could a shop w/ two ISO tap sets use two right handed taps and chase > >>it w/o ruining the existing threads?
> No. You'll trash the threads. Do it right or just use your old bottle > bracket.
To amplify, the French BB thread is 35x1mm pitch, so the ISO taps are the wrong pitch.
> > >>That said, looking at the specs of the ISO BB it looks like they're > > >>1.375 x 24 TPI, which comes to 34.9, or possibly close enough to 35... > > >>could a shop w/ two ISO tap sets use two right handed taps and chase > > >>it w/o ruining the existing threads?
> > No. You'll trash the threads. Do it right or just use your old bottle > > bracket.
> To amplify, the French BB thread is 35x1mm pitch, so > the ISO taps are the wrong pitch.
To confuse, note that cartridge BBs do not need to be tightened nearly as much as cup'n cone units.
On 6 Nov, 07:24, RonSonic <ronso...@tampabay.rr.com> wrote:
> Not speaking from much experience, but the Italian BB is also RH threads both > sides and the ones I've seen were simply hogged all the way through from one > side. I'd think that was the point of having only RH threads, you trade off cup > loosening for a straight easy to machine bottom bracket.
During the time of the bicycle boom when national standards were adopted, Italians drank coffee, French drank water and English drank gin or porter.
thirty-six wrote: > On 6 Nov, 07:24, RonSonic <ronso...@tampabay.rr.com> wrote:
>> Not speaking from much experience, but the Italian BB is also RH threads both >> sides and the ones I've seen were simply hogged all the way through from one >> side. I'd think that was the point of having only RH threads, you trade off cup >> loosening for a straight easy to machine bottom bracket.
> During the time of the bicycle boom when national standards were > adopted, Italians drank coffee, French drank water and English drank > gin or porter.
> >> Not speaking from much experience, but the Italian BB is also RH threads both > >> sides and the ones I've seen were simply hogged all the way through from one > >> side. I'd think that was the point of having only RH threads, you trade off cup > >> loosening for a straight easy to machine bottom bracket.
> > During the time of the bicycle boom when national standards were > > adopted, Italians drank coffee, French drank water and English drank > > gin or porter.
No evidence there of assembly workers beverage consumption at breakfast and lunch when bottom bracket threads became standardized. What's the point in that?
> > > >>That said, looking at the specs of the ISO BB it looks like they're > > > >>1.375 x 24 TPI, which comes to 34.9, or possibly close enough to 35... > > > >>could a shop w/ two ISO tap sets use two right handed taps and chase > > > >>it w/o ruining the existing threads?
> > > No. You'll trash the threads. Do it right or just use your old bottle > > > bracket.
> > To amplify, the French BB thread is 35x1mm pitch, so > > the ISO taps are the wrong pitch.
> To confuse, note that cartridge BBs do not need to be tightened nearly > as much as cup'n cone units.
(Assuming you meant tightened as much in terms of thread length, not torque)
On Nov 6, 3:49 am, thirty-six <thirty-...@live.co.uk> wrote:
> Cut the thread off your cartridge unit to length to match your bottom > bracket shell. Use a file. Scrape the threads in the shell with a > steel pick. Oil up and try again. If it still wont seat, tapering > the thread on the cartridge shell for the last two or three threads > should get it sorted.
I've considered that, but it feels really hackish. I may have to resort to that, but would rather not!
On 8 Nov, 22:40, Rex Kerr <rexk...@gmail.com> wrote:
> On Nov 6, 3:49 am, thirty-six <thirty-...@live.co.uk> wrote:
> > Cut the thread off your cartridge unit to length to match your bottom > > bracket shell. Use a file. Scrape the threads in the shell with a > > steel pick. Oil up and try again. If it still wont seat, tapering > > the thread on the cartridge shell for the last two or three threads > > should get it sorted.
> I've considered that, but it feels really hackish. I may have to > resort to that, but would rather not!
Be professional, wear an apron and a pair of latex gloves. ;-)
"b...@mambo.ucolick.org" <bjwei...@gmail.com> wrote: > On Nov 6, 10:40 pm, Chalo <chalo.col...@gmail.com> wrote: > > bjw wrote:
> > > John Thompson wrote:
> > > > >[OP wrote:]
> > > > >>That said, looking at the specs of the ISO BB it looks like they're > > > > >>1.375 x 24 TPI, which comes to 34.9, or possibly close enough to 35... > > > > >>could a shop w/ two ISO tap sets use two right handed taps and chase > > > > >>it w/o ruining the existing threads?
> > > > No. You'll trash the threads. Do it right or just use your old bottle > > > > bracket.
> > > To amplify, the French BB thread is 35x1mm pitch, so > > > the ISO taps are the wrong pitch.
> > To confuse, note that cartridge BBs do not need to be tightened nearly > > as much as cup'n cone units.
> (Assuming you meant tightened as much in terms > of thread length, not torque)
> More threads than a random BB cup set I looked > at for comparison. It's French, it has to be different.
What I do not understand is the hollow spindle. I know about the math, and have not done the calculation. Still, my intuition tells me that bottom bracket spindles are so on the edge that removing any material takes them too far into the frequent failure regime to be worth the minuscule weight saving.
> >> Not speaking from much experience, but the Italian BB is also RH threads both > >> sides and the ones I've seen were simply hogged all the way through from one > >> side. I'd think that was the point of having only RH threads, you trade off cup > >> loosening for a straight easy to machine bottom bracket.
> > During the time of the bicycle boom when national standards were > > adopted, Italians drank coffee, French drank water and English drank > > gin or porter.
>>>> Not speaking from much experience, but the Italian BB is also RH threads both >>>> sides and the ones I've seen were simply hogged all the way through from one >>>> side. I'd think that was the point of having only RH threads, you trade off cup >>>> loosening for a straight easy to machine bottom bracket. >>> During the time of the bicycle boom when national standards were >>> adopted, Italians drank coffee, French drank water and English drank >>> gin or porter.
> >>>> Not speaking from much experience, but the Italian BB is also RH threads both > >>>> sides and the ones I've seen were simply hogged all the way through from one > >>>> side. I'd think that was the point of having only RH threads, you trade off cup > >>>> loosening for a straight easy to machine bottom bracket. > >>> During the time of the bicycle boom when national standards were > >>> adopted, Italians drank coffee, French drank water and English drank > >>> gin or porter.
> > Many surprises there. I expected Sweden, Iceland, and Norway to match Finland. > > I knew many Finns are heavy drinkers.
> > USA is below average, and average is weighted by population. > > Another surprise.
> > France, Spain, Portugal above average; Italy below.
> > I am average or above for USA. > > Probably all the Baptists in the USA. > > They need to pick up the slack.
> I assume the Russians play in their own league - off the chart.
According to what little I could find through some klutzy searches it's between 15 & 18 L/yr, or right up there with *.lu. Another interesting thing is that the Whirled Health Orgasm convieniently says, "consumption of more than 8 liters per year poses a real threat to the health of the nation. "
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