B.B. size for 1983 miyata 1024 grand touring
08-29-19, 10:59 AM
#1
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B.B. size for 1983 miyata 1024 grand touring
I'm rebuilding my 1983 miyata 1024 grand touring. I'm updating the components to more modern tech. I'm having trouble finding the right bottom bracket size. Does anyone know where to find the spec's for this frame?
08-29-19, 04:05 PM
#2
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I dont, but one thing to do , assuming you are going to put a square taper in , is to remove the cranks arms and measure the length of the axel, as this will be important to know for buying a new bb, also assuming you are going to use the same crankset.
what are you thinking of putting on it, crankset wise?
being 1983 and japanese, one would think it uses standard threading and shell diameter and all that, but do find out, good luck getting the proper info.
the mid range shimano UN-26 or 25 works fine, and the un-55 is a better quality one at a reasonable price also.
but then again, myabe you are going to go outboard bearings and cranksets.
what are you thinking of putting on it, crankset wise?
being 1983 and japanese, one would think it uses standard threading and shell diameter and all that, but do find out, good luck getting the proper info.
the mid range shimano UN-26 or 25 works fine, and the un-55 is a better quality one at a reasonable price also.
but then again, myabe you are going to go outboard bearings and cranksets.
08-29-19, 06:36 PM
#3
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If using a triple my guess is that it will be 118 to 122mm or longer. Certainly not anything under 118mm. It will take some experimentation with the different lengths and crank. Not sure any specs for vintage cranks are available, or reliable.
If square taper, spend the little extra and get the UN55 from Shimano. Nearly indestructible.
If square taper, spend the little extra and get the UN55 from Shimano. Nearly indestructible.
08-29-19, 07:39 PM
#4
Senior Member
If using a triple my guess is that it will be 118 to 122mm or longer. Certainly not anything under 118mm. It will take some experimentation with the different lengths and crank. Not sure any specs for vintage cranks are available, or reliable.
If square taper, spend the little extra and get the UN55 from Shimano. Nearly indestructible.
If square taper, spend the little extra and get the UN55 from Shimano. Nearly indestructible.
Great value bb. Has the metal loose cup, not plastic, used to any way.
09-02-19, 09:10 AM
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If you are trying to use an external bottom bracket, you’ll need at least 2 spacers.
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Stuart Black
Plan Epsilon Around Lake Michigan in the era of Covid
Old School…When It Wasn’t Ancient bikepacking
Gold Fever Three days of dirt in Colorado
Pokin' around the Poconos A cold ride around Lake Erie
Dinosaurs in Colorado A mountain bike guide to the Purgatory Canyon dinosaur trackway
Solo Without Pie. The search for pie in the Midwest.
Picking the Scablands. Washington and Oregon, 2005. Pie and spiders on the Columbia River!
