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[Brompton] Add disk brake to original fork?

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[Brompton] Add disk brake to original fork?

Old 06-01-18, 06:24 AM
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Winfried
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[Brompton] Add disk brake to original fork?

Hello,

I'm not technical but I could find someone who knows about welding/brazing/soldering.

Out of curiosity, what would it take to add a disk brake to the original fork? Do I just need to add a contraption on the fork to hold the disk caliper?

I'm interested in having a disk brake in the front, but 500 is a bit too much money.

Thank you.
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Old 06-01-18, 07:05 AM
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berlinonaut
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Originally Posted by Winfried View Post
what would it take to add a disk brake to the original fork?
Probably at first a wider original fork. currently the original needs a 74mm hub (vs. 100mm "usual" size) - when adding a disc brake it would to be even slimmer. Not sure if i.e. Dahon or Tern do have 74mm disc hubs. Other than that I would not be sure if the current original Brompton forks are suited well to fit the forces from disc brakes (that are different from those of rim brakes).
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Old 06-01-18, 12:40 PM
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Looking at the Brompton fork shape I think it is designed to flex a little to soak in the bumps. This will not be ideal for disk brakes as the caliper will rub the rotor even if you manage to weld/braze a mount. I am not an expert and maybe it's doable if you are riding around town and not going down mountain passes. Road bikes without shocks have disk brakes now.
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Old 06-01-18, 01:55 PM
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A disc means that you have to have a much stronger fork blade to avoid bending it. A regular large wheel bike would have to have a much stronger fork than a small wheel bike, but still even on your small wheel bike you are risking damage to the bike and yourself if you try it.
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Old 06-01-18, 02:42 PM
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Thanks for the feedback.
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Old 06-02-18, 10:23 AM
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has to be 10cm wide too, not 7.4 , you need to buy Ben Cooper's upgrade frame parts .

get the set with an Alfine disc hub compatible rear end. too..

you can even use French-British rail via the Chunnel, get to Glasgow, in Person.




...
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Old 10-24-19, 11:58 AM
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I notice there are 74mm disk hubs, and adapters are available to retrofit disk calipers on bikes with rim brakes.

Would a Brompton fork have to be significantly hardened to withstand a disk brake?

And to avoid increasing the depth of the bike while folded, what about installing the disk on the right instead?

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Old 10-24-19, 03:35 PM
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Can't provide any input here, but just wanted to say that it would be nice to have at least one disk or the option for disk brakes. My first mile is a long descent and I don't particular like using calipers to slow down, especially when wet. My rims get quite toasty.
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Old 10-24-19, 04:23 PM
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If no one's done it and people shell out big buck$ for tailor-made forks from Kinetics, Eerder Metaal, et al., I guess it's either not doable or unsafe with the original fork.
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