Using Presta valve/rim nut as brake spacer
02-07-24, 12:56 AM
#1
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Using Presta valve/rim nut as brake spacer
Apparently above nut can work as a spacer for the recessed area in fitting nutted dual pivot caliper brakes to frames drilled for recessed nut brakes.
Need dimensions of this nut. Google is if no use.
If you have access to this nut, can you measure the ID, OD and thickness?
Photo below for reference.
Thanks
Need dimensions of this nut. Google is if no use.
If you have access to this nut, can you measure the ID, OD and thickness?
Photo below for reference.
Thanks
02-07-24, 08:58 AM
#2
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Do you need the nut specifically, or a filler for the fork.
If it's a fork filler, know that the thread is wrong.
Again, if for a fork, the easiest solution is to drill out a recess nut to 6mm, to make a perfect adaptor.
Or cut the brake down, IF it has enough thread.
If it's a fork filler, know that the thread is wrong.
Again, if for a fork, the easiest solution is to drill out a recess nut to 6mm, to make a perfect adaptor.
Or cut the brake down, IF it has enough thread.
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An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
02-07-24, 09:16 AM
#3
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2. For fork & brake bridge.
3. Rim nut is apparently M6 x 0.75 or 0.8mm. What is the thread of bolt in nutted brake?
4. Do not want to drill existing recessed nut. Any source for recessed nuts? US is fine.
02-07-24, 09:46 AM
#4
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1- Sure. Nuts can work as spacers. Shops have used PV base nuts for spacing out rack struts from the face of a dropout eyelet for decades, as example.
2-Sure.
3- Brake center bolts and frame mounting bolts generally have M6 threads, 6mmx1mmpt.
4- Here in the US most shops have a box full of misc. recessed nuts of varying lengths and flange diameters. They are kind of a small part to suffer shipping costs on but I would be surprised if on line venders don't have them available. Perhaps a bike shop on line site instead of a no brick and mortar warehouse type of seller.
If the goal is to use a conventional exposed nut caliper mounting (as opposed to a recessed nut type) I have used a big washer to cover the large recessed nuts fitting in the frame or fork before with no issues. Andy
2-Sure.
3- Brake center bolts and frame mounting bolts generally have M6 threads, 6mmx1mmpt.
4- Here in the US most shops have a box full of misc. recessed nuts of varying lengths and flange diameters. They are kind of a small part to suffer shipping costs on but I would be surprised if on line venders don't have them available. Perhaps a bike shop on line site instead of a no brick and mortar warehouse type of seller.
If the goal is to use a conventional exposed nut caliper mounting (as opposed to a recessed nut type) I have used a big washer to cover the large recessed nuts fitting in the frame or fork before with no issues. Andy
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02-07-24, 10:35 AM
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When I worked for a bike distributor, our shop had a drawer full of recessed nuts in various lengths. The bikes we sold required extra long nuts, so the nuts that were supplied with the brake callipers were not needed. Brake callipers are usually supplied with several different nut lengths to fit different forks. The ones not needed are surplus. I bet any decent shop would also have all kinds of spares.
02-07-24, 11:55 AM
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Here's the answer you really want. For this one anyway.
ID .215"
OD .394"
thick .115"
02-07-24, 12:02 PM
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The nut from my Bell inner tubes is 0.115" give or take a few thousandths. The minor ID of the threading is 0.216 give or take a few thousandths. OD is .395". Again, give or take a few.
02-07-24, 05:18 PM
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FBinNY has it right. Just get a 6mm recessed brake nut and clearance it out so it slides on the brake shaft
/markp
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02-07-24, 05:39 PM
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Just FYI, Presta nuts fit on DA 7700 brake studs.
02-08-24, 01:51 AM
#12
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Here are the dimensions in mm.
ID 5.46
OD 10
thickness 2.92
Given the OD of 10mm, the nut will not fit in the recess (OD 8mm) and is no better than a M6 washer. With an M6 washer, don't have to worry about the thread.
Is the above a reasonable conclusion?
Last edited by anga; 02-08-24 at 01:58 AM.
02-10-24, 06:34 PM
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Thanks dedhed and Iride01
Here are the dimensions in mm.
ID 5.46
OD 10
thickness 2.92
Given the OD of 10mm, the nut will not fit in the recess (OD 8mm) and is no better than a M6 washer. With an M6 washer, don't have to worry about the thread.
Is the above a reasonable conclusion?
Here are the dimensions in mm.
ID 5.46
OD 10
thickness 2.92
Given the OD of 10mm, the nut will not fit in the recess (OD 8mm) and is no better than a M6 washer. With an M6 washer, don't have to worry about the thread.
Is the above a reasonable conclusion?
02-11-24, 05:43 AM
#14
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I don't know where you live, but in cities that have a fair amount of mechanical industry, there is often an industrial hardware supply, that has darn near every conceivable nut and bolt made (in non-massive sizes), SAE and metric, sold singly, and much cheaper than the local bike shop. In the greater Seattle WA USA area, it's Tacoma Screw. Mail order, there's McMaster-Carr, and Grainger, both industrial supply with enormous range of goods, but you often have to buy a pack or box of whatever. For common stuff like M5(?) stainless steel, socket-head cap screws (allen head bolts) for rack braze-ons and such, it was cheapest to buy a package of assortment of lengths on Amazon for like $8, has me set for life.
"The world is put together with half-thirteen socket head cap screws." - my high school vocational metal shop teacher
"The world is put together with half-thirteen socket head cap screws." - my high school vocational metal shop teacher
Last edited by Duragrouch; 02-11-24 at 05:49 AM.
