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-   -   "standard" locations for rack braze-ons? (http://www.bikeforums.net/framebuilders/697277-standard-locations-rack-braze-ons.html)

mudboy 11-24-10 08:00 AM

"standard" locations for rack braze-ons?
 
I'm building a 650b does-it-all frame and want to make it rack-ready for both front and rear racks. I'll be using M6 hourglass-type braze-ons. Is there a standard distance that these braze-ons should be placed from the dropout? Or do I need to decide on a set of racks now and fit the braze-ons with the rack in place?

Also, any recommendation on a porteur-style front rack? The VO is pretty expensive, I'd like to find something more affordable.

Thanks,

Pete

Live Wire 11-24-10 09:30 AM

Build your own!
Racks are fun and easy to do.


As far as braze-on placement, most commercial racks are made to use a mount on the drop and are adjustable at the top- you'd be safe using a VO frame as a guide.

mudboy 11-24-10 10:03 AM

I've thought about doing that. How would this work?

tuz 11-24-10 10:08 AM

Yeah build you own! Basically you need a bender and some round files. It is tricky to get the racks to be flat in all directions.

Besides the VO I'm not aware of other "porteur" racks. Some builders sell them but they are more pricey as you can imagine. My porteur had 15-20 foot of 3/8x0.035. At $3/foot you're already down $50-60 in materials...

tuz 11-24-10 10:15 AM

Oh that's pretty cheap for SS. I'd go with 3/8 at least. SS is weaker than cromo. Moreover, depending which silver you use you might not be able to build a strong fillet (45% or Ni-Ag fillets fine). But it's nice not to have to paint it.

JohnDThompson 11-24-10 11:45 AM

Quote:

Originally Posted by mudboy (Post 11835271)
I'm building a 650b does-it-all frame and want to make it rack-ready for both front and rear racks. I'll be using M6 hourglass-type braze-ons. Is there a standard distance that these braze-ons should be placed from the dropout? Or do I need to decide on a set of racks now and fit the braze-ons with the rack in place?

Also, any recommendation on a porteur-style front rack? The VO is pretty expensive, I'd like to find something more affordable.

Thanks,

Pete

Have the rack in hand to locate the braze-ons.

fietsbob 11-24-10 12:40 PM

Radius of tire + clearance over it for said fender, some above fender..
draw a horizontal line..

M6 ? M5 is normal.

NoReg 11-24-10 04:23 PM

For expedition touring 6 ought to be the standard, and that might well apply to the heavy porteur use, of say a courier. For light, heavy touring, like my several weeks a year, I haven't actually broken a 5. With 5s I would settle for water bottle mounts because maybe they do less damage to the tube during installation. The seat stay is a different load than a fork, and I just prefer the neat installation of 5s at the neutral axis of the fork. One thing I have done, though I haven't tried a build yet, is I did once look at some BMX aftermarket forks, and they have footpeg mounts and some interesting beefy details that got me thinking. For 5s I place the lower mount so it penetrates the fork, and a plug in fork plug, that's a Sakkit detail, at least to me. The upper I place in standard position relative to the lower mount, not the drop. I figure I can get the rack attached properly if I custom build it to standard rack placements.


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