27" to 700 wheel and cassette conversion
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27" to 700 wheel and cassette conversion
I have on old '70's steel frame home built 27" as a spare bike and don't want to throw it away. I would like to fix it up so that my son can join me on some rides. Problem - it's an old 10 speed, and I would like to add a better gearing. Stay with me on this! I am also thinking of updating my roadie from 9 speed veloce to maybe record or similar. How much of the group set would fit the 27" with success? I know I won't be able to use the brake set, but would like to try to use the rest? Do Campy make 36 spoke hubs? Any ideas or tips
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Other than the 4mm extra reach brake issue which you're already aware of, the only other real barrier is the rear triangle width, which is now either 120 or 126mm and needs to be spread to 130mm (from 126, you don't have to actually have to spread the stays, you can simply spring it open and shove the wheel in. This was a common practice in the era when this change was happening, though I still prefer to spread (cold set) the frame to make wheel changes easier.
Campagnolo made 36h hubs for decades, but I believe (subject to correction) that they no longer do, due to the lack of demand. No problem building 32h wheels for the conversion though.
Campagnolo made 36h hubs for decades, but I believe (subject to correction) that they no longer do, due to the lack of demand. No problem building 32h wheels for the conversion though.
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Couple of additional notes:
1. The bikes of the 70's aren't or overtime have become miss-aligned. Running modern index shifting system requires good alignment, so after cold setting check the derailleur hanger's alignment.
2. I would suggest lacing wheels with a 700c rim. This will provide move tire choices and rim selection, versus trying to lace an old rim onto a new campy hub. To adjust for the short diameter of the 700c wheels use a long reach brake caliper.
3. Front derailleur clamp, if not brazed on, might be to small, as 70's tubing was traditionally smaller then modern tubing.
Best to read this: https://www.sheldonbrown.com/frame-spacing.html
Enjoy the rides with your son. Riding with my dad 25 years ago is how I got into cycling.
Good luck!
1. The bikes of the 70's aren't or overtime have become miss-aligned. Running modern index shifting system requires good alignment, so after cold setting check the derailleur hanger's alignment.
2. I would suggest lacing wheels with a 700c rim. This will provide move tire choices and rim selection, versus trying to lace an old rim onto a new campy hub. To adjust for the short diameter of the 700c wheels use a long reach brake caliper.
3. Front derailleur clamp, if not brazed on, might be to small, as 70's tubing was traditionally smaller then modern tubing.
Best to read this: https://www.sheldonbrown.com/frame-spacing.html
Enjoy the rides with your son. Riding with my dad 25 years ago is how I got into cycling.
Good luck!
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Other than the 4mm extra reach brake issue which you're already aware of, the only other real barrier is the rear triangle width, which is now either 120 or 126mm and needs to be spread to 130mm (from 126, you don't have to actually have to spread the stays, you can simply spring it open and shove the wheel in. This was a common practice in the era when this change was happening, though I still prefer to spread (cold set) the frame to make wheel changes easier.
Campagnolo made 36h hubs for decades, but I believe (subject to correction) that they no longer do, due to the lack of demand. No problem building 32h wheels for the conversion though.
Campagnolo made 36h hubs for decades, but I believe (subject to correction) that they no longer do, due to the lack of demand. No problem building 32h wheels for the conversion though.
As velorider says, it would be better to use 700c's to give me some more tyre (aus spelling) choices, and that's another option, might keep that option open for now.
Thanks
PS We're all thinking of you guys over here.
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Couple of additional notes:
1. The bikes of the 70's aren't or overtime have become miss-aligned. Running modern index shifting system requires good alignment, so after cold setting check the derailleur hanger's alignment.
2. I would suggest lacing wheels with a 700c rim. This will provide move tire choices and rim selection, versus trying to lace an old rim onto a new campy hub. To adjust for the short diameter of the 700c wheels use a long reach brake caliper.
3. Front derailleur clamp, if not brazed on, might be to small, as 70's tubing was traditionally smaller then modern tubing.
Best to read this: https://www.sheldonbrown.com/frame-spacing.html
Enjoy the rides with your son. Riding with my dad 25 years ago is how I got into cycling.
Good luck!
1. The bikes of the 70's aren't or overtime have become miss-aligned. Running modern index shifting system requires good alignment, so after cold setting check the derailleur hanger's alignment.
2. I would suggest lacing wheels with a 700c rim. This will provide move tire choices and rim selection, versus trying to lace an old rim onto a new campy hub. To adjust for the short diameter of the 700c wheels use a long reach brake caliper.
3. Front derailleur clamp, if not brazed on, might be to small, as 70's tubing was traditionally smaller then modern tubing.
Best to read this: https://www.sheldonbrown.com/frame-spacing.html
Enjoy the rides with your son. Riding with my dad 25 years ago is how I got into cycling.
Good luck!
The only thing with going to 700c as sheldon brown states is that the older style give a more comfy ride. Now as my lad is a self confessed MTB and BMX NUT, I think he will appreciate the softer ride, so i'll consider all options carefully before I jump into one?
Now i'm not too sure about the front derailleur clamp braze on type v the other type? so i'll have to research that.
Anywho, thanks for the valuable advice, now at least I have a better idea of my feasible options.
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Couple of additional notes:
1. The bikes of the 70's aren't or overtime have become miss-aligned. Running modern index shifting system requires good alignment, so after cold setting check the derailleur hanger's alignment.
2. I would suggest lacing wheels with a 700c rim. This will provide move tire choices and rim selection, versus trying to lace an old rim onto a new campy hub. To adjust for the short diameter of the 700c wheels use a long reach brake caliper.
3. Front derailleur clamp, if not brazed on, might be to small, as 70's tubing was traditionally smaller then modern tubing.
Best to read this: https://www.sheldonbrown.com/frame-spacing.html
Enjoy the rides with your son. Riding with my dad 25 years ago is how I got into cycling.
Good luck!
1. The bikes of the 70's aren't or overtime have become miss-aligned. Running modern index shifting system requires good alignment, so after cold setting check the derailleur hanger's alignment.
2. I would suggest lacing wheels with a 700c rim. This will provide move tire choices and rim selection, versus trying to lace an old rim onto a new campy hub. To adjust for the short diameter of the 700c wheels use a long reach brake caliper.
3. Front derailleur clamp, if not brazed on, might be to small, as 70's tubing was traditionally smaller then modern tubing.
Best to read this: https://www.sheldonbrown.com/frame-spacing.html
Enjoy the rides with your son. Riding with my dad 25 years ago is how I got into cycling.
Good luck!
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Between two reasonably similar wheels, the biggest influence on ride quality is tire pressure. Some 27" rims aren't hooked, which by design can't take as much pressure as hooked rims. So you end up running a wider tire at a lower pressure, which creates more comfort.
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What? Not like Sheldon to make such a silly statement. Can you show where?
Between two reasonably similar wheels, the biggest influence on ride quality is tire pressure. Some 27" rims aren't hooked, which by design can't take as much pressure as hooked rims. So you end up running a wider tire at a lower pressure, which creates more comfort.
Between two reasonably similar wheels, the biggest influence on ride quality is tire pressure. Some 27" rims aren't hooked, which by design can't take as much pressure as hooked rims. So you end up running a wider tire at a lower pressure, which creates more comfort.
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Sheldon Brown's bike info ~~~ Park Tools repair help
Half-step triple, using double gear ~~~ 6400 STI rebuild walkthrough ~~~ Want 8/9/10s @126mm OLD? OCR. ~~~ Shimano cassette body overhaul ~~~ Ergopower Escape wear repair ~~~ PSA: drivetrain wear
List of US/Canada bike co-ops ~~~ Global list
Sheldon Brown's bike info ~~~ Park Tools repair help
Half-step triple, using double gear ~~~ 6400 STI rebuild walkthrough ~~~ Want 8/9/10s @126mm OLD? OCR. ~~~ Shimano cassette body overhaul ~~~ Ergopower Escape wear repair ~~~ PSA: drivetrain wear
List of US/Canada bike co-ops ~~~ Global list