derekgabs

Are the 2 holes in rear part of the frame good to hold the adapter? or i would need to drill or find a part to hold more of the adapter.

Also do you guys have a good idea on how to make custom adapter? LOL Would i need to buy the hubs and disc brake and rotors first so that i could make a sort of measurements? Please Help..

Additional Info: Distance between 2 holes is 20.5mm. Having 5mm as diameter of both holes

badmother

those two holes is for rack and fenders. Your bike is not ment for discs.

If you want to change that I think your only option is welding one on. Is your bike steel or alu? Could also be alu frame and steel fork.

Is there a framebuilder in your area?

In the front it may be possible to use a different fork that already has the disc mounts on it. Do not buy without being sure it`ll fit. It is a jungle out there.

derekgabs

True it was meant for a rack. But i saw the a2z adapter that would be good for frames without disc brake ready



I want to try and make something that is pretty much the same but on a specific size just intended for the frame of my bike but im kinda having difficulty on getting the right measurements. Would it be good to buy first the parts? or something?

BTW: My bike is made of steel

brakemeister

let me say this.... if you want to add sic brakes to a bike which is not designed from the fround up to accept disc brakes , you are asking for trouble, very mediocre results, loads of money invested, and what you ending up with is a very very expensive junk bike, which doesnt work ....

get some magura hydros which will fit on your canti studs and you are halfways there, without the expense and headache ...

thor

derekgabs

actually i don't have canti studs on my frame.. really bad that's why I ended up using the old band brake system.

BassNotBass

No, it's not good for frames without disc brake caliper bosses... it's a kludge. Rack eyelets normally aren't strong enough to withstand the forces transmitted via a disc brake caliper.

badmother

If you really need discbrakes I suggest looking for an different bike, that may end up being cheaper in the long run, especially if you can find a second hand bike.

if you just want your present bike to have better brakes I suggest you get some caliper brakes in fair quality, https://www.sjscycles.co.uk/brakes-ca...t601_pg1/#page= maybe also new brakelevers depending on what you have now.

Also get some good stiff housing and good brakepads. It is going to make a big difference. Calipers is used on roadbikes all the time, should be able to stop a folder also.

fietsbob

Show Pictures of your Welding and Machine Shop..


BIKE friday's Pocket Llama is available with disc brakes.. but it is not a fast fold get on the Bus/Train, design.

Narrow 74mm disc brake hubs do not exist, but Greenspeed [AU] did custom modify SA drum brake hubs
to work on Bromptons.

badmother

Stop being rude. Can easely be done in any kitchen.

smallwheeler

show pictures of your kitchen..

brakemeister

again MUCH better off if you find something used with disc brakes already on it.
For example I have some Matrix in small frame size left which sell for 650 dlr ....
https://www.thorusa.com/dahon/current/matrix.htm

I will make a bet that an ill fated conversion will cost more... think new wheels, new fork , welding some stuff on a frame which will break, disc brakes, rotors, cables, levers ........ did I forget something ?

badmother

Exactely, you do not know what you are missing . I did this work in my kitchen: https://www.bikeforums.net/showthread...+wheeled+bikes

dynaryder

This. Every 'disc adapter' I've seen is kludge;you're not adding fenders to a frame without eyelets,you're modding your bike's braking system. Also note you will need disc hubs,and you might need to further mod your frame to get the proper spacing for those.

To do this proper,you have 3 options:
A) get a good framebuilder to mod your frameset(and possibly make a new fork)
B) go custom with a Bike Friday
C) get one of those cheap folders off eBay(just search 'folding disc brake'). While these aren't high end,you'd prolly do better in the long run getting one of those and upgrading the parts than trying to mod your current ride.

derekgabs

uhm.. if i were to change my wheel size.. what wheel size would fit the road bike brake caliper? im using Size 20 x 1.75. Would i need it to be changed to 1.35 or something thinner?

badmother

Your wheel size is 20" (406). Your tyre size is 20x1,75. I think you are asking if you need to use a slimmer tyre, like 1,30.

What you need to find out is the distance from the hole in the fork crone and brake bridge where you would mount the brakes and down to the center of the rim (where the brake pads go). this is the reach you need for the brakes.

Judging from Thors site https://www.thorusa.com/accessories/special.htm you need a caliper of between 55 and 73 on an avreage 20" folder, you need to find out if it is the same for your bike.

Like these: https://www.sjscycles.co.uk/tektro-te...ing-prod24459/ . I am not suggesting these are good brakes, just showing you what numbers to look for. Others may know more about how much you should spend and what to buy.

Look at the picture of the blue bike https://www.bikeforums.net/showthread...5#post15306125 , caliper brakes.

bhkyte

I agree that a good double pivot caliper, soft compound pads,teflon lined caAbles,stiff outers would proberly beas far as youu would need to go to get good brakes. However, I had rear band brakes on my diblasi's and they were at least as good as some upgraded calipers on my other bikes.
I hAve 2 suggestions.
1) try upgading current cables to teflon linned, and add telfon linned outercable. Make sure lever is not a weak link also. Anotomicaly vertical racing levers are easier to pull also.
If this does not give you the results you need for around £10, then look at further upgrades.
2 I wounder if going for new wheel option why not a drum brake instead?

badmother

What frontbrake is curently on this bike?

I agree about drumbrake, but also a hubgear wheel with a coasterbrake is an option. Just sayin.

fietsbob

maybe change from a 406 rim, wheel, to a 451 rim, wheel, .. bigger rim , thinner tire.

derekgabs

i guess that can also be good.. but i think i measured my bike, i think it was about 83mm..

derekgabs

Actually i got new generic stainless brake cables and a new housing. I just wanted to know if it would be possible to attach an adapter on the rear end of my folding bike. The folding isn't really that Dahon or Tern like bikes. Its just a surplus bike from Japan that was restored and got new upgrades.

derekgabs

Just a stock generic caliper. I'm still trying to find some ideas on how i can upgrade my front brakes i think i would try to find something.

both are really good suggestions, but i got a problem with the cash.

derekgabs

uhm. i got a problem with the calipers for road. I think the measurements for the caliper of a road is just to small and couldn't reach the rims. (I measured it from the center of the caliper bolt in the front part of the bike down to the rim and i think my measurement is about 83mm.)

badmother

try looking at BMX brakes. Long reach calipers is awailable but you want them in fair quality so look for something decent. Where to look depends on where you are (USA, Europe, far east..)Could look for it locally or a webshop that sell to BMX. Maybe do some searching and reading in the BF BMX forum.

smallwheeler

always listen to mother:

tektro FS984A

fietsbob

Since the problem finally comes out as brake wont reach, change the Brake to one that will.


Too much blind guessing for me, But if you bring it to a decent Bike Shop
they may be able to find the parts you need .

can see whole project not just small frame close picture.