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Search: Posts Made By: guy153
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Forum: Framebuilders
09-21-21, 02:03 AM
Replies: 4
Views: 243
Posted By guy153

I know someone who made one from a kit. I don't...

I know someone who made one from a kit. I don't know which kit, but it gave you a simple jig, scale drawings, everything you needed. It probably took him a couple of months. Obviously you can spend...
Forum: Framebuilders
09-18-21, 04:26 PM
Replies: 14
Views: 419
Posted By guy153

I just looked up the stack height on a...

I just looked up the stack height on a Specialized Rockhopper XXL. It's 654mm. I recently finished a bike with a stack height of 717mm (https://www.bikeforums.net/22226303-post430.html). But the...
Forum: Framebuilders
09-18-21, 03:12 AM
Replies: 5
Views: 219
Posted By guy153

If it hasn't physically changed shape it should...

If it hasn't physically changed shape it should be fine. Check for ripples on the down-tube close to the head-tube. You can get a bit of deformation there sometimes that you don't always notice, and...
09-12-21, 11:11 AM
Replies: 27
Views: 717
Posted By guy153

Maybe if your race number is a different size you...

Maybe if your race number is a different size you move the little chrome dealy out to the other boss?

Or it could be an adventure nipple ahead of its time. Modern "gravel" bikes are usually...
Forum: Framebuilders
09-12-21, 02:48 AM
Replies: 6
Views: 346
Posted By guy153

My guess is sadly not. I don't weld aluminium but...

My guess is sadly not. I don't weld aluminium but generally quality alu frames need heat-treatments. So even if you cut the TT and DT a bit shorter and rewelded the HT on I think the whole thing...
Forum: Framebuilders
09-12-21, 02:36 AM
Replies: 429
Views: 273,434
Posted By guy153

Latest build completed. As you can see some...

Latest build completed. As you can see some pretty rad yet traditional geometry on this one. The idea is high stack for commanding road position, no sore neck, hands or shoulders, plus a comfortable...
Forum: Framebuilders
09-11-21, 02:22 AM
Replies: 3
Views: 251
Posted By guy153

This gives you everything including mitre...

This gives you everything including mitre templates and runs on Linux. But might not be as graphical as you want. You have to be OK with using command line tools.
​​​​...
Forum: Framebuilders
09-11-21, 02:17 AM
Replies: 11
Views: 341
Posted By guy153

I'm not a huge fan of the really short CS on many...

I'm not a huge fan of the really short CS on many MTBs now. I actually fell over backwards on one as I was trying out trying to get out of a bombhole.

I think it's supposed to make the handling...
Forum: Framebuilders
09-10-21, 02:33 PM
Replies: 14
Views: 419
Posted By guy153

There are some online frame fit calculators where...

There are some online frame fit calculators where you measure up all your body and it spits out recommended numbers which you then ignore.

I started measuring bikes I already had and interpolating...
Forum: Framebuilders
09-10-21, 02:22 PM
Replies: 11
Views: 341
Posted By guy153

I think they may be ensteepening the STs on MTBs...

I think they may be ensteepening the STs on MTBs because they're so long at the front and often short CS. The steep ST puts the rider a bit more back in the middle.
Forum: Framebuilders
09-10-21, 03:03 AM
Replies: 11
Views: 341
Posted By guy153

It makes sense that this would be true. If you...

It makes sense that this would be true. If you have a 71 HT then the fork is being bent more as opposed to being pushed on like a pillar or column. Curved blades probably also make a difference for...
Forum: Framebuilders
09-09-21, 07:02 PM
Replies: 429
Views: 273,434
Posted By guy153

Wow this has to be the most ambitious flux core...

Wow this has to be the most ambitious flux core project of all time! I think a bike frame is one of the hardest welding projects you can do (thin-walled, round, thin to thick, safety critical) and...
Forum: Framebuilders
09-09-21, 09:05 AM
Replies: 11
Views: 353
Posted By guy153

The purpose of the repeating is just to sneak up...

The purpose of the repeating is just to sneak up on the right dimension without overshooting-- you have to relax it all in order to measure the final set. I don't think it has any effects on the...
Forum: Framebuilders
09-07-21, 02:21 PM
Replies: 11
Views: 353
Posted By guy153

I think Bulgie is right that this is a property...

I think Bulgie is right that this is a property of just two things: yield strength and stiffness. 531 ought therefore to be similar to CroMoly in theory (as yield strength and stiffness are similar)....
Forum: Framebuilders
09-07-21, 02:14 PM
Replies: 11
Views: 353
Posted By guy153

I use the threaded rod and the way it seems to...

I use the threaded rod and the way it seems to work is you go out what feels like miles (160mm, 170mm etc.) and it keeps returning to exactly where it was. But at some point it does start to move...
Forum: Framebuilders
09-05-21, 01:50 AM
Replies: 25
Views: 743
Posted By guy153

I put those numbers into my "CAD" and it doesn't...

I put those numbers into my "CAD" and it doesn't look good. This is assuming CS that are 22.2mm/18mm at the oval part. The green line is at 18mm. But if you use CS with a bend in them there will be...
Forum: Framebuilders
09-04-21, 06:37 AM
Replies: 25
Views: 1,100
Posted By guy153

Could have used the canti posts for a rando rack!

Could have used the canti posts for a rando rack!
Forum: Framebuilders
08-28-21, 02:32 AM
Replies: 27
Views: 1,057
Posted By guy153

I wasn't using a lathe but one of these type of...

I wasn't using a lathe but one of these type of things:

https://i.ebayimg.com/images/g/OoYAAOSw7jRgZIbd/s-l1600.jpg

A lathe is probably better at holding everything in the correct position even...
Forum: Framebuilders
08-27-21, 02:17 PM
Replies: 27
Views: 1,057
Posted By guy153

That's a really good idea. You should be able to...

That's a really good idea. You should be able to wrap sandpaper around a tapered tube if you just cut the edges at an angle. I figured out the math to make tapered mitre templates and used those (you...
Forum: Framebuilders
08-11-21, 04:06 PM
Replies: 15
Views: 869
Posted By guy153

Yes I just eagerly went to have a look... and saw...

Yes I just eagerly went to have a look... and saw something about "unboxing a dengfu".
Forum: Framebuilders
08-10-21, 04:18 PM
Replies: 15
Views: 869
Posted By guy153

Good point about Ceeway! I had forgotten they had...

Good point about Ceeway! I had forgotten they had practice tubes on there. Reynolds tubes are sort of made in the UK but I suspect they only do the butting and heat-treating in Birmingham. The actual...
Forum: Framebuilders
08-10-21, 02:10 PM
Replies: 14
Views: 645
Posted By guy153

You're not supposed to weld 531.

You're not supposed to weld 531.
Forum: Framebuilders
08-10-21, 02:08 PM
Replies: 15
Views: 869
Posted By guy153

Your approach is definitely preferable if you...

Your approach is definitely preferable if you have a good source for new tubing. Here in UK the only tubes as thin-wall as frame tubing I can easily get hold of are actual bike tubes-- either...
Forum: Framebuilders
08-10-21, 06:13 AM
Replies: 13
Views: 1,111
Posted By guy153

I have a Chinese minilathe on which I can just...

I have a Chinese minilathe on which I can just about make binder bolts, crown race seats, handlebar stem components and other odds and ends, plus a few tools. Definitely worth having although you can...
Forum: Framebuilders
08-10-21, 06:08 AM
Replies: 14
Views: 645
Posted By guy153

Don't you just need to saw the top off in that...

Don't you just need to saw the top off in that case?
Forum: Framebuilders
08-08-21, 04:49 PM
Replies: 25
Views: 1,100
Posted By guy153

Thanks! This is really useful. Seat-stays usually...

Thanks! This is really useful. Seat-stays usually only need very gentle bends anyway.
Forum: Framebuilders
08-08-21, 04:48 PM
Replies: 15
Views: 869
Posted By guy153

I would start with learning how to weld or braze...

I would start with learning how to weld or braze (or both) because that's the skill that takes the most practice. You can also cut up old scrap bike frames for a cheap source of practice material and...
Forum: Framebuilders
08-08-21, 02:19 AM
Replies: 25
Views: 1,100
Posted By guy153

How do you do this? I'm still looking for a good...

How do you do this? I'm still looking for a good redneck way to bend SS-- the exact bend you want depends on the frame size and the tyre size so it's something it would be nice to be able to do.
Forum: Framebuilders
08-06-21, 02:02 AM
Replies: 11
Views: 632
Posted By guy153

I don't like disks on road bikes because I'd much...

I don't like disks on road bikes because I'd much rather have pencil-thin SS, a fork that isn't all beefed up, and the braking force going through the fork crown and SS bridge which are on the...
Forum: Framebuilders
08-05-21, 09:54 AM
Replies: 14
Views: 778
Posted By guy153

That's lucky. I make the fork first and then...

That's lucky. I make the fork first and then measure it before finalizing the frame design. My unicrown came out at 407mm, which seems to be anticipating the latest standards! Completely by accident.
Forum: Framebuilders
08-05-21, 09:51 AM
Replies: 11
Views: 632
Posted By guy153

Using them to mount a rando rack looks quite cool...

Using them to mount a rando rack looks quite cool though. I'm thinking of making one of these:

https://swoodcycles.bigcartel.com/product/twisted-t-rack

(Apologies to S. Wood for nicking his...
Forum: Framebuilders
08-05-21, 09:33 AM
Replies: 4
Views: 327
Posted By guy153

Does he mean a Breezer dropout? Sometimes also...

Does he mean a Breezer dropout? Sometimes also called a TIG dropout because they're nice for TIG welding onto. It's sort of shaped like a cowl.

...
Forum: Framebuilders
07-17-21, 04:10 PM
Replies: 16
Views: 833
Posted By guy153

I think that's a head-tube. Some of these are...

I think that's a head-tube. Some of these are supplied very long and they're the only non-butted tubes in the Reynolds catalogue. Also those dimensions work out to a 34mm ID (which is HT sized).
Forum: Framebuilders
07-11-21, 04:37 PM
Replies: 16
Views: 821
Posted By guy153

Idk if powder coating would fill them in but a...

Idk if powder coating would fill them in but a very small amount of car body filler sanded down smooth (it's very easy to sand) should do the trick.
Forum: Framebuilders
07-11-21, 02:03 AM
Replies: 8
Views: 591
Posted By guy153

Interesting experiment! Really you need a blind...

Interesting experiment! Really you need a blind test. Do you have a friend you can put on the bike and ask if he can feel any difference and if so what? You can tell him you moved the alignment but...
Forum: Framebuilders
07-11-21, 02:02 AM
Replies: 20
Views: 1,058
Posted By guy153

Well at least then you won't have any difficult...

Well at least then you won't have any difficult dilemmas about whether to save the frame or not... After five minutes of going at it with the stick it won't even be wall-art any more.
Forum: Framebuilders
07-11-21, 01:59 AM
Replies: 20
Views: 1,058
Posted By guy153

It can be rewelded fine IMO. But what you would...

It can be rewelded fine IMO. But what you would do is cut out the whole TT and sand the HT and ST ends back to smooth metal. No grooves or anything, just get rid of the entire original tube and the...
Forum: Framebuilders
07-08-21, 01:16 PM
Replies: 20
Views: 1,058
Posted By guy153

The HT and the top of the ST are pretty thick...

The HT and the top of the ST are pretty thick though and you're replacing the TT. So it would probably be all right.
Forum: Framebuilders
07-08-21, 01:38 AM
Replies: 20
Views: 1,058
Posted By guy153

Frame is toast. But you could replace the TT...

Frame is toast. But you could replace the TT which might be a fun project. Why did it fail there? Probably also just from hard use (and maybe it would have failed at the DT if it hadn't been for the...
Forum: Framebuilders
07-08-21, 01:33 AM
Replies: 18
Views: 901
Posted By guy153

Yes agree with Andy. A bamboo fork is just too...

Yes agree with Andy. A bamboo fork is just too sketchy for all the reasons he gave. A fork only has to fail in one place and you faceplant. Highest risk of failure plus highest consequences. There's...
Forum: Framebuilders
07-07-21, 12:56 PM
Replies: 2
Views: 357
Posted By guy153

It's not so much the air-hardening (which only...

It's not so much the air-hardening (which only has any effect near the welds) as the heat treatment that 853 has that makes this is a problem.
Forum: Framebuilders
06-26-21, 06:50 AM
Replies: 0
Views: 255
Posted By guy153

Unicrown fork mitring jig

Having found the last time that these are very tricky to do by hand (at least for me) I thought I'd have a go at making a jig to hold things steady for mitring with a hole saw. Actually worked out...
Forum: Framebuilders
06-25-21, 02:28 AM
Replies: 29
Views: 3,880
Posted By guy153

Nice work to do it with a spreadsheet! I wrote...

Nice work to do it with a spreadsheet! I wrote mine in Python. It does render a scale drawing (more for sanity checking) and mitre templates. You save the bike design (in an .ini file) and then it...
Forum: Framebuilders
06-16-21, 11:23 AM
Replies: 43
Views: 2,395
Posted By guy153

Agree. The stoke of riding a frame you made...

Agree. The stoke of riding a frame you made yourself far exceeds any actual differences in the performance of the materials. Bamboo opens this up to more people. It's also actually a pretty good...
Forum: Framebuilders
06-15-21, 06:12 AM
Replies: 10
Views: 846
Posted By guy153

Ah I see what you mean-- it's probably a repair....

Ah I see what you mean-- it's probably a repair. Hence all the horrible black paint. The ends of the bridge tube are brazed. So the original joint (which probably was brazed) failed and someone...
Forum: Framebuilders
06-15-21, 02:28 AM
Replies: 10
Views: 846
Posted By guy153

Yes I agree with everyone, it doesn't look too...

Yes I agree with everyone, it doesn't look too bad (apart from being ugly) and probably won't fail. Especially if it gas-pipe tube-- you can get away with more since it's all just mild steel. It...
Forum: Framebuilders
06-11-21, 01:35 AM
Replies: 13
Views: 1,060
Posted By guy153

The other bonus is that if for whatever reason...

The other bonus is that if for whatever reason you lose the threads cut into the frame (I'm always nervous about threads cut into permanent fixtures) you can just throw a nut on the outside.
04-21-21, 11:37 AM
Replies: 72
Views: 9,636
Posted By guy153

Good question, I'm not sure. I think if you have...

Good question, I'm not sure. I think if you have a wider handlebar (the ones currently used on MTBs are ridiculously wide) you probably want longer trail. Increasing the trail kind of gears up the...
Forum: Framebuilders
04-19-21, 12:31 PM
Replies: 10
Views: 1,651
Posted By guy153

I also mitre by hand. It's not a difficult mitre....

I also mitre by hand. It's not a difficult mitre. Most important is that the chainstays are exactly the same length, or the back wheel won't sit right. You can only do this if you can fixture it...
04-09-21, 12:39 PM
Replies: 15
Views: 863
Posted By guy153

There's a guy on YouTube called CYCLINGABOUT who...

There's a guy on YouTube called CYCLINGABOUT who goes on long tours in places like Patagonia. Really nice channel and beautiful scenery. Anyway he loves belt drives (and they do work really well for...
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