or Connect
Cycling Forums › Forums › Bikes › Cycling Equipment › Bottom Brackets
New Posts  All Forums:Forum Nav:

Bottom Brackets

post #1 of 6
Thread Starter 
I have an aluminum road frame that has the old style non-cartridge bottom bracket. I love the frame and would like to upgrade the components but not sure it's worth it if I can't convert to the cartridge style or if there is a higher end old-style.
Is there any difference in the frame or just the bb? All the rest of my components are low-end shimano.
post #2 of 6

Re: Bottom Brackets

Quote:
Originally posted by biker13
I have an aluminum road frame that has the old style non-cartridge bottom bracket. I love the frame and would like to upgrade the components but not sure it's worth it if I can't convert to the cartridge style or if there is a higher end old-style.
Is there any difference in the frame or just the bb? All the rest of my components are low-end shimano.
Cartrige BB are available. Match the BB threading to your frame and spindle length and type to the new crankset.
post #3 of 6
is your current BB a tapered square type?

if so, you may want to get a newer splined BB like ISIS or Octalink (Shimano). they are lighter and stiffer, but this could necessitate getting a new crank as well.
post #4 of 6
Your BB is probably english thread being a Japanese gruppo currently on the frame. Measure the width of the BB which which should be 68mm. This is one of the standard sizes. You should be able to find a suitable BB to fit the bike. I have a couple of bikes from the 60's that I could "upgrade" to a cartridge if I wanted to but they work just fine as is. On the other hand I have much newer bikes with the latest technology that work fine too.
If you want to spend for a newer gruppo you should be able to. You won't be able to change the gap in your rear stays of an Aluminum frame. To go to a higher gearing you may need to measure the inside spacing which could be 127, 130, or 135. This will determine the hub size you can go for. Take the frame to a good mechanic and ask his unbiased opinion as a mechanic and not a salesman first.
The gruppo can be determined on your pocket book's size and personal preferences.
post #5 of 6
Quote:
Originally posted by Deanster
Your BB is probably english thread being a Japanese gruppo currently on the frame. Measure the width of the BB which which should be 68mm.
You won't be able to change the gap in your rear stays of an Aluminum frame. To go to a higher gearing you may need to measure the inside spacing which could be 127, 130, or 135. This will determine the hub size you can go for.
Japaneese BB and groups could be had with threading other than english. 68mm shell width is english thread. Good point on spreading the dropouts,but road stuff was/is 120,126 and 130. His old stuff won't be 130 unless it's already 8 speed. There was aslo a compromise 128 spacing that was used o alot of late 7 speeds,and that can accomodate a 130 hub.
post #6 of 6
Thread Starter 
Thanks for the info. It is currently a 7 speed but I will measure the span and see what I can do. It's really a nice frame that fits me well, it just came with cheap components. I just completed my first 2 day century on it and it held up extremely well compared to alot of the more expensive bikes I saw with flats and chain breaks. It even survived an endover at about 25mph.
Even if I only upgrade minimally, it's still a great tool around bike for the Monon. Thanks again for the help.
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Cycling Equipment
Cycling Forums › Forums › Bikes › Cycling Equipment › Bottom Brackets