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LHT...Tubus Duo mounting problems

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LHT...Tubus Duo mounting problems

Old 01-21-18, 10:38 PM
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MAK
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LHT...Tubus Duo mounting problems

Hello all,

As the title says, I'm having problems mounting a Tubus Duo to my LHT. Everything seems fine except the holes on the inside of my fork seem to be too small for the hardware provided. (Both the Tubus provided hardware and the mounting hardware supplied by The Touring Store.) All of the other bolts screw into their mounting points with no problem.

I just wrote to Surley for suggestions, but then realized the wealth of experience on this forum.

The bolts go in a revolution or two and then stop. I don't want to force the bolt in and damage the frame. Has anyone else experienced a similar problem?

I'll probably call Wayne (fantastic to talk and deal with) at the Touring Store tomorrow for his insight.

Thank you.
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Old 01-22-18, 01:55 AM
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It might help to clean out threads: I had my Trucker powder-coated but that made eyelet threads fit tight & I even cross-threaded the rear derailleur, somehow i didn't completely destroy the hanger. BTW I recently installed a Tubus Duo & it interfered with quick-release skewer so I had to buy bolt-on skewers.
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Old 01-22-18, 03:54 AM
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Tubus duo on LHT

Its a long time since I fitted Tubus duo racks to my LHT but I have a recollection that a "bolt" (actually a cap screw) goes in either side of the braze on.

If your cap screws are too long the first side will block the entry of the cap screw from the other side.

Easily tested by screwing the first side halfway out then see whether the second side will go in firther.

Cheers

Mike
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Old 01-22-18, 06:17 AM
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When I fit Tubus racks to my LHT the first thing I did was to run a tap through the braze-ons to chase the threads. Getting some quality A-4 stainless bolts will make your assembly a lot stronger. Assemble everything loosely at first, then tighten it up once you are sure it'll work and fit right. Hope this helps!
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Old 01-22-18, 08:23 AM
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I had problems with a Surly frame years ago, they refused to fix it under warranty. But that was years ago, perhaps they are better now, give them a few days to respond before you do anything. They might pay for a bike shop to re-tap the threads.

If you have the same luck with Surly that I had, a 5mm tap from a hardware store might solve your problems.

You probably would need a tap holder too. If it is just cleaning existing threads you might be able to use a small vice grip to hold the tap, but a tap holder would work better than a vice grip because with a proper tap holder it is easier to align the tap correctly.

Or, a bike shop might tap the threads for only a few bucks, call around to see what they would say.

The Surly frame that I used to have, I had to tap all the M5 threads, bought a tap to do that.
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Old 01-22-18, 02:02 PM
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they Surly , are selling thru bike shops. go thru your dealer, with the QBP account.. Surly is their brand. Maxway Ltd TW is their builder.

yea a thread chasing with a 5x.8mm tap will be the proper tool..
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Old 01-22-18, 08:19 PM
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Thanks to all for your replies. I'm off to my LBS this week to tap the threads. BTW, Surly responded and said that I either had the wrong bolts (impossible) or that I had to chase the tap.
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Old 01-22-18, 10:59 PM
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I don't recall issues on my Disc Trucker but I know it took us a while to get it on. Chase the threads and see what happens after that.
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Old 01-23-18, 04:55 PM
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Originally Posted by MAK View Post
Thanks to all for your replies. I'm off to my LBS this week to tap the threads. BTW, Surly responded and said that I either had the wrong bolts (impossible) or that I had to chase the tap.

let us know how you went
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Old 01-23-18, 10:32 PM
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Just built up a LHT recently, you are going to want to tap those holes out for sure. Every single threaded hole on mine was completely filled with paint/powder coat. Took literally days of tapping holes out whenever I had free time. The mid fork eyelets are almost impossible to completely clean out, even tapping from both sides a normal tap won't reach all the way through that thing.

It was really weird, Surly frames usually come good to go out of the box. They never need facing/chasing/taping from my experience. I did notice it had some sort of black base coat under the powder coating that extended inside the tubes, I wonder if that's what got all inside everything.
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Old 01-31-18, 10:51 AM
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Originally Posted by Dark Arrow View Post
let us know how you went
The LBS was able to chase the bosses in just a few minutes. I'm just a bit disappointed that I had to have this done. I expected better quality control. Unfortunately, hearing from others on this thread, the problem seems to occur somewhat frequently.
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Old 01-31-18, 12:44 PM
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Originally Posted by MAK View Post
The LBS was able to chase the bosses in just a few minutes. I'm just a bit disappointed that I had to have this done. I expected better quality control. Unfortunately, hearing from others on this thread, the problem seems to occur somewhat frequently.
Some manufactures take the time to clean out the threads after painting, some don't. The Surly I had was the only frame that required it, the other frames from other manufacturers did not require it.

One of the frames I have, the dealer offered cleaning out the threads as an extra cost option. I chose to not pay it since I had the right taps. But I did not have to tap out a single hole either. I do enough bike work that I bought an M5 and M6 tap.
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Old 01-31-18, 12:51 PM
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Surly Imports and distributes their frames, your retail shop could finish the pre delivery prep.

in the 80s many famous brand frames shipped them expecting the retail shop to do a lot more thread cleanup,

Using their BB taps , and facing tools.. rather than the company in Italy.

So, Campagnolo sold their frame prep tool sets to a lot of bike shops.




...
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Old 01-31-18, 12:57 PM
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Excess paint is common and usually not a big issue, at least for me.
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