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Is this feasible?

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Is this feasible?

Old 10-26-18, 03:42 PM
  #1  
Tandem Tom
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Is this feasible?

During a ride today I came up with an idea I hope you fellows might be willing to answer! We just returned from 2 months of touring in Europe. I ride a Surly LHT which I really enjoy. But after this last your I am wishing for a sloping top tube. Is it pispossi to have the horizontal top tube replaced ewit a sloping top tube? I know the frame would need to be re-finished.
Thanks in advance for your help!
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Old 10-26-18, 03:58 PM
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It is possible to cut out the top tube and replace it with a sloping top tube. You would not be able to shorten the seat tube without also replacing the seat stays. If your only goal is a lower standover height and you really want to keep the frame, you could put in a sloping top tube and leave the stays alone. I would add a short brace tube going from the seat tube to the top tube to transfer any bending forces, the seat stays place on the seat tube, back to the top tube. There is probably a vent hole where the top tube joins the seat tube and the added brace tube would cover the hole.

In the end, it may not be worth the expense of paying someone to do the work and having the frame refinished.

Last edited by dsaul; 10-26-18 at 04:02 PM.
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Old 10-26-18, 04:52 PM
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As dsaul says, yes but might not be worth it cost wise. I've replaced a very few top tubes including lowering one at both ends (don't ask...). It's a fair amount of work and often stuff comes along that wasn't initially considered.

If you're doing this yourself then go right ahead, you likely don't care about any resale value anyway. If you have to pay someone else to do this take pause. Andy
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Old 10-26-18, 07:23 PM
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One thought that comes to mind is. Will I be weakening the frame? Will the handling change?
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Old 10-26-18, 09:02 PM
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As long as the replacement tube is of similar spec and the removal/reinstall work is done with proper care there should be no discernable change to strength, stiffness or handling. But as I mentioned things happen, crop up that might not have been expected and how there unknowns are dealt with can make a difference. As example- On cutting away the current top tube one finds out that the main frame was built with a twist that shows it's self when the bracing of the top tube goes missing. Or another- you don't properly jig the frame before mitering and brazing in the new tube and the head angle changes a bit. Andy
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Old 10-27-18, 06:21 AM
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Thanks! I will make time to meet with Joe B.
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Old 10-27-18, 10:08 AM
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That's a $600-1000 job on a $500 frame. I would look to see if you can make a smaller frame fit, or get a Fargo
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Old 10-27-18, 01:06 PM
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Why?

Hire a Custom frame built from scratch,
now that you are satisfied with the rest of the dimensions..

what do you expect to gain with a sloping top tube? (that yours wont deliver now)





...

Last edited by fietsbob; 10-27-18 at 01:11 PM.
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Old 10-27-18, 01:21 PM
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My thinking is a sloping top tube will make mounting and dismounting easier. I would think replacing the top tube would be cheaper than a custom build. Thought I wouldn't mind a custom build!!!
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Old 10-27-18, 01:46 PM
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several years ago two guys from Sweden Passed thru town about this time of year,
they were riding step thru steel frame commuter bikes , with 622-42 tires .. and Nexus 8 speed gear hubs.

They had started in Anchorage Alaska, and were riding the coast then across the southern tier,
and planning to fly home from Miami..

For Step thru I've Been Riding my Bike Friday a Lot..

as a touring bike they're great, no big boxes to find, at end of trip...
domestic, a passable 62" suitcase fold fit, is where they shine..

This summer , late, A Box & ship job was a Thorn Low Step an X braced top tube

going to bodge up a MaxWay frame? have them do this, picture from here ..



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Old 10-27-18, 02:36 PM
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What a way to make a simple frame into a complex one Here's what I did for the same goal for a low step over. Andy
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Old 10-27-18, 04:30 PM
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Originally Posted by Tandem Tom View Post
My thinking is a sloping top tube will make mounting and dismounting easier. I would think replacing the top tube would be cheaper than a custom build. Thought I wouldn't mind a custom build!!!
So you step over the top tube? I don't even like to do that on a mixte
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Old 10-27-18, 05:35 PM
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Yep, that's the way I do it. With rear panniers and a dry bag on the rest Tubus rack it is too high to swing my leg over all the baggage!
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Old 10-29-18, 11:25 AM
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I lean the bike over, then..
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Old 10-29-18, 11:35 AM
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Bike Friday is my step through easy to mount bike,


they can match all the dimensions off your LHT, re use your components ,
and you also get a bike that packs down in a size
to meet the 61" luggage girth , for air travel .. w/o surcharges
making getting to tour starts/ returns, simpler..





...
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