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Tektro dual pivot mounting bolt length

Old 08-09-21, 09:06 AM
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Tektro dual pivot mounting bolt length

Replacing old universal side pulls and want to use the Tektro dual pivots, issue is they need to be nutted(not inset nuts) and all the 39-54 reach seem to have the inset type of nut, the longer reach Tektros shown on the net are of the exterior nutted type but I don't need/want long reach. Anyone know if the mounting bolt on the 39-54 reach is long enough to work with exterior nuts? Below is the 39-54 I want but not with those inset nuts. thanks, Brian

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Old 08-09-21, 09:49 AM
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...they are not long enough for this, but what is often done is to use the front brake in the rear, so you can nut that brake, then drill out the rear hole on the fork, and use a long recessed brake nut to mount the rear brake on the front. Otherwise, you're stuck swapping out all the brake parts onto pivot bolts that are long enough for nutted brakes.

Are you sure that the longer reach brakes won't work with the pads raised up all the way ? You can usually extend the slots a little bit either up or down using a file or a spinning drill bit in a battery drill.
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Old 08-09-21, 01:56 PM
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"...what is often done is to use the front brake in the rear, so you can nut that brake, then drill out the rear hole on the fork, and use a long recessed brake nut to mount the rear brake on the front."


Quick google search shows 30mm available, seems like that will work, has anyone used that length for this purpose? Asking before I buy the brakes.

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Old 08-09-21, 02:55 PM
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Originally Posted by calstar View Post
"...what is often done is to use the front brake in the rear, so you can nut that brake, then drill out the rear hole on the fork, and use a long recessed brake nut to mount the rear brake on the front."


Quick google search shows 30mm available, seems like that will work, has anyone used that length for this purpose? Asking before I buy the brakes.

thanks

...it's the long ones they make to mount the front brake on a big, wide CF fork crown, whatever that length is. 30mm might be it. But if the bike is old enough that both the old brakes were nutted, you still need to enlarge the hole on the back half of the fork crown to accept the width of the nut. Depends on the age of the bike. For a while there, they were coming with the recessed nut brake in front, and still nutted in the rear.

I just did one of these adaptations a couple of weeks ago, but I don't recall the drill size. Just measure the diameter of the recessed nut with a caliper, and be very careful not to go too big on the drill bit.
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Old 08-09-21, 03:00 PM
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...I did not invent this method. Here is the link where I first learned it. Scroll down to Mounting recessed-mounting calipers on older frames.
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Old 08-10-21, 09:21 AM
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I did the bolt change on a pair of Dura Ace 7400 to convert to regular nut mount. I put a longer mounting bolt on the rear and used it for the front. It's a common bolt size for many manufacturers.

Here is the 1977 Nishiki with nut mount DA 7400


Completed with no frame modification.
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Old 08-10-21, 11:07 AM
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Thanks to those that gave input. Just found this vid, one way to do it:
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