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Search: Posts Made By: guy153
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Forum: Framebuilders
10-21-20, 11:40 AM
Replies: 31
Views: 2,372
Posted By guy153

Sounds like it's going to be a sweet bike. I like...

Sounds like it's going to be a sweet bike. I like road stays but they don't allow for as much tyre clearance as the beefier curved ones (which are more intended for MTB, gravel and touring bikes.
...
Forum: Framebuilders
10-18-20, 02:32 PM
Replies: 34
Views: 1,581
Posted By guy153

There will always be some welding jobs that it...

There will always be some welding jobs that it doesn't make sense to outsource because you can't ship a whole bridge, railway station or complete system of pipes from China. There are also people who...
Forum: Framebuilders
10-18-20, 10:46 AM
Replies: 34
Views: 1,581
Posted By guy153

The other day we had an electrician come round to...

The other day we had an electrician come round to replace a fusebox. He kept trying to do what he had quoted as a two hour job too quickly. He kept rushing, dropping things, swearing, falling off his...
10-12-20, 10:55 AM
Replies: 18
Views: 512
Posted By guy153

They're usually very strong although they're...

They're usually very strong although they're available in different sizes. They're all 34.8mm on the inside (English threads) and some are as much as 40mm on the outside. That's 2.6mm wall thickness....
10-07-20, 05:57 AM
Replies: 91
Views: 2,694
Posted By guy153

I do build my own frames :) Out of steel because...

I do build my own frames :) Out of steel because it's the only thing I know how to weld and also because it's sick. I use Columbus or Reynolds tubing (Reynolds is actually a bit cheaper for me right...
10-07-20, 01:41 AM
Replies: 91
Views: 2,694
Posted By guy153

The way trail works is a little bit like a gear...

The way trail works is a little bit like a gear ratio. Longer trail is like putting a higher gear on the steering-- you need to turn it less to get the same result but it takes a bit more force. The...
10-05-20, 05:53 AM
Replies: 91
Views: 2,694
Posted By guy153

It is quite unusual to see such a low BB drop on...

It is quite unusual to see such a low BB drop on a gravel bike. But 70mm is normal for a road bike and those fat tyres are at least 10mm taller. So ground clearance will actually be fine on most of...
Forum: Framebuilders
10-04-20, 09:49 AM
Replies: 34
Views: 1,581
Posted By guy153

It depends what you're welding and what kind of...

It depends what you're welding and what kind of joint it is. You will always see discoloration from the heat but full penetration is indicated by some actual lumpiness from some melting of the metal....
Forum: Framebuilders
10-03-20, 02:30 PM
Replies: 11
Views: 687
Posted By guy153

https://cimg3.ibsrv.net/gimg/bikeforums.net-vbulle...

https://cimg3.ibsrv.net/gimg/bikeforums.net-vbulletin/2000x1130/dsc_0006_20f04bf05d192ec327b88dae3702ee962092de75.jpg
SRAM 1x11

Thanks! Built the bike up today. 68mm shell, 130mm spacing,...
09-30-20, 06:13 AM
Replies: 15
Views: 351
Posted By guy153

As others have said you can probably just replace...

As others have said you can probably just replace the middle ring. The important metrics there are the radius of the circle of the bolts holding it on (bolt circle diameter) and the number of teeth....
09-28-20, 03:00 PM
Replies: 13
Views: 466
Posted By guy153

Absolutely nothing to worry about except the...

Absolutely nothing to worry about except the cosmetic annoyance.

​​​​​​No harm in using a bit of car body filler if you are able to get hold of some paint the right colour.
09-28-20, 06:38 AM
Replies: 47
Views: 16,154
Posted By guy153

I think the primer does some "etching". Not sure...

I think the primer does some "etching". Not sure exactly what that is but it's reacting with the metal somehow to stop it rusting. The problem is not the clear topcoat so much as the non-existence of...
09-26-20, 05:08 AM
Replies: 47
Views: 16,154
Posted By guy153

I made a frame recently for a friend who wanted a...

I made a frame recently for a friend who wanted a raw finish. I had heard about rust spiders appearing under the clear so I tried blackening it with "Phillips Professional Cold Gun Blue" from Amazon...
09-25-20, 08:54 AM
Replies: 23
Views: 883
Posted By guy153

Well what technically allows the higher tension...

Well what technically allows the higher tension is not the stiffness but the strength, in particular the fatigue strength. What they tend to do with modern rims rather than increase the spoke tension...
Forum: Framebuilders
09-23-20, 12:22 PM
Replies: 34
Views: 1,581
Posted By guy153

Not very funny to make you get sunburned like...

Not very funny to make you get sunburned like that! A good weld should be pretty but a pretty weld isn't necessarily good. I'm a little dubious about "pulse and lay wire" which some people use on...
Forum: Framebuilders
09-23-20, 11:32 AM
Replies: 34
Views: 1,581
Posted By guy153

Flux core actually works all right if you get a...

Flux core actually works all right if you get a decent quality wire, not the cheap crap off Amazon, and your work piece is anywhere between 2mm and 3/32" thick.
09-23-20, 03:22 AM
Replies: 23
Views: 883
Posted By guy153

In theory the rim is under the most load when...

In theory the rim is under the most load when you're not even riding the bike, because of all the spokes pulling on it. As you ride you're only reducing that load on part of the rim at a time. So a...
Forum: Framebuilders
09-21-20, 11:09 AM
Replies: 34
Views: 1,581
Posted By guy153

I've made fireplaces out of 5mm plate with the...

I've made fireplaces out of 5mm plate with the TIG. Mine goes up to 160A. I did two passes and used a 3/32 rod.

MIG is for when you're in a hurry or don't have three hands. I would always rather...
Forum: Framebuilders
09-21-20, 01:03 AM
Replies: 34
Views: 1,581
Posted By guy153

My TIG machine came with a stinger so I bought a...

My TIG machine came with a stinger so I bought a box of 6013 rods to play around with. Lots of mess, smoke and boogers. Stick welders are sold to hobbyists but they only really work on metal 1/8" and...
Forum: Framebuilders
09-17-20, 11:19 AM
Replies: 102
Views: 4,277
Posted By guy153

I should also make myself a redneck version of...

I should also make myself a redneck version of Brodie's gauge. But I'm not sure it's so necessary to align the front triangle apart from twist, and I've never had it twist, at least not measurably by...
Forum: Framebuilders
09-16-20, 12:08 PM
Replies: 23
Views: 1,530
Posted By guy153

https://cimg9.ibsrv.net/gimg/bikeforums.net-vbulle...

https://cimg9.ibsrv.net/gimg/bikeforums.net-vbulletin/2000x1667/bridge_bdb9a2da48decffc715d6386abdd04e2cfa996c3.jpg

If the hole being a bit off-centre bugs you, how do you think I feel? As you can...
Forum: Framebuilders
09-16-20, 02:36 AM
Replies: 102
Views: 4,277
Posted By guy153

That looks really good! But are those bottle cage...

That looks really good! But are those bottle cage boss holes on the back of the ST in the second picture? They can be filled in but I hope the BB shell is the right way round with the left-tighty...
Forum: Framebuilders
09-08-20, 09:49 AM
Replies: 102
Views: 4,277
Posted By guy153

That looks really good! I was talking about...

That looks really good!

I was talking about my rear triangle "jig" earlier in this thread. I had this setup for another frame yesterday and took a picture. As you can see it's very simple, mainly...
09-05-20, 02:17 AM
Replies: 21
Views: 1,322
Posted By guy153

All steel (used in bike frames anyway) has the...

All steel (used in bike frames anyway) has the same material stiffness. Because chromo is stronger you can use thinner tubes and so usually end up with a less stiff frame. You can compensate by going...
Forum: Framebuilders
09-01-20, 01:50 AM
Replies: 31
Views: 9,495
Posted By guy153

Ain't that the truth. And now they've made the...

Ain't that the truth. And now they've made the frames too stiff they're selling everyone on fat tyres and really long seatposts.
Forum: Framebuilders
08-20-20, 01:03 AM
Replies: 102
Views: 4,277
Posted By guy153

Both look good :) You also don't want the CS too...

Both look good :) You also don't want the CS too far to the edge of the BB because you don't want to start welding into the BB faces. I leave a minimum of 5mm either side. Probably something similar...
Forum: Framebuilders
08-18-20, 01:25 PM
Replies: 102
Views: 4,277
Posted By guy153

Was watching Paul Brodie on YouTube. He is an...

Was watching Paul Brodie on YouTube. He is an amazing framebuilder and artist. Anyway he does DT to BB first because he figures that joint needs to be stronger. I can't fault his logic. But there's...
Forum: Framebuilders
08-18-20, 06:37 AM
Replies: 102
Views: 4,277
Posted By guy153

The first few frames I did the main triangle...

The first few frames I did the main triangle first (which I think is more normal). But the place where you need to be most precise with alignment is the rear triangle. It's easier for me to get the...
Forum: Framebuilders
08-18-20, 02:13 AM
Replies: 102
Views: 4,277
Posted By guy153

I have a homemade jig but I don't use it for the...

I have a homemade jig but I don't use it for the rear triangle. I get better precision like this:

1. Weld BB shell to ST
​​​​2. Draw a straight line on the table (for the frame centre line) and a...
Forum: Framebuilders
07-09-20, 03:11 PM
Replies: 31
Views: 2,372
Posted By guy153

Correct, all steel will have the same ride...

Correct, all steel will have the same ride quality if the wall thickness, diameter and geometry are the same.
Forum: Framebuilders
07-04-20, 02:23 PM
Replies: 31
Views: 2,372
Posted By guy153

I'm surprised that the weight and price...

I'm surprised that the weight and price differences are as big as you're being quoted. 631 is only a little bit stronger than 4130. It's just meant to respond better to welding but not by so much...
Forum: Framebuilders
07-04-20, 01:01 PM
Replies: 15
Views: 943
Posted By guy153

I found the other half of that bit I cut off: ...

I found the other half of that bit I cut off:


https://cimg0.ibsrv.net/gimg/bikeforums.net-vbulletin/816x910/cs2_894038b8e412fa81b962adcf8beaebc851c35114.jpg

A bit out of focus. In this...
06-25-20, 02:36 AM
Replies: 24
Views: 1,176
Posted By guy153

They usually last a bit longer than that. I get a...

They usually last a bit longer than that. I get a few thousand km out of a chain and a cassette lasts three or four chains or so. I don't do a great deal of maintenance (each chain gets properly...
Forum: Framebuilders
06-18-20, 01:46 PM
Replies: 8
Views: 579
Posted By guy153

I was welding it and it did go a little bit oval...

I was welding it and it did go a little bit oval but still averaged out to the right size and the cups went in fine. I was quite pleased because I only have a proper reamer for EC30 and was planning...
Forum: Framebuilders
06-18-20, 11:13 AM
Replies: 8
Views: 579
Posted By guy153

On the last frame but one I built I used a...

On the last frame but one I built I used a Reynolds 631 headtube with a 34mm ID for the usual 11/8 headset. It was supplied at the exact right size and didn't really need reaming. I sort of skimmed...
04-27-20, 10:54 AM
Replies: 168
Views: 13,487
Posted By guy153

From Reynolds but via my bad memory. It's...

From Reynolds but via my bad memory. It's actually about 2.5x stronger. UTS for 953 is quoted as 1850MPa, and 531 is about 700 or 800MPa.

My point still stands though: you could use 531 in...
04-12-20, 01:33 PM
Replies: 168
Views: 13,487
Posted By guy153

It's all the same alloy but there are a few...

It's all the same alloy but there are a few differences.

Some 4130 may be made from a sheet that's rolled up and welded (in a machine) and then drawn over a mandrel a few times (called "DOM" for...
04-03-20, 07:06 AM
Replies: 52
Views: 2,272
Posted By guy153

Yes except it will be too narrow for rear wheels....

Yes except it will be too narrow for rear wheels. I did use some old fork dropouts on my homemade stand but actually rear axles are 1mm larger diameter so you have to file them out a bit too.
03-11-20, 04:31 PM
Replies: 59
Views: 8,335
Posted By guy153

853 is about 1.7x the price of 631. 725 a little...

853 is about 1.7x the price of 631. 725 a little bit cheaper than 631. 631 is about 1.5x the price of 525 which is 725 minus the heat treatment (and is standard cromoly, either 4130 or 25crmo4).
...
03-07-20, 02:31 PM
Replies: 59
Views: 8,335
Posted By guy153

They're not stiffer just stronger and less...

They're not stiffer just stronger and less ductile. The reduced ductility I think is what leads to the myth that 753 and 853 (heat treated versions of 531 and 631 respectively) are stiff. They're a...
Forum: Road Cycling
03-07-20, 08:49 AM
Replies: 77
Views: 11,211
Posted By guy153

I have to take issue with their marketing there....

I have to take issue with their marketing there. Columbus's Niobium alloy is the natural competitor to Reynolds 853. Both are about the same strength and are non-stainless HSLA alloys. The Columbus...
03-05-20, 11:06 AM
Replies: 125
Views: 8,659
Posted By guy153

There is supposed to be some reason for them...

There is supposed to be some reason for them which I've forgotten which seemed a bit silly. Maybe it was so that you can let them down without needing a little spike to push in the middle (but why...
02-23-20, 01:49 PM
Replies: 106
Views: 19,182
Posted By guy153

I think he has a point. If you're paying...

I think he has a point. If you're paying thousands for a frame that costs (according to Hambini) about $80 to make there should never be any issues with the accuracy of the BB and the HT. I think all...
02-17-20, 02:52 PM
Replies: 101
Views: 5,936
Posted By guy153

This is all good info and quite correct. Last...

This is all good info and quite correct. Last year it was reported in the news that someone has invented a welding rod for 7075 which may be a game-changer
...
Forum: Framebuilders
01-30-20, 03:01 AM
Replies: 9
Views: 873
Posted By guy153

I don't think the angle at the top is an issue....

I don't think the angle at the top is an issue. Just weld or braze it up and it will be fine.

When you buy regular dropouts they don't make different ones for different seat stay angles. You want...
01-26-20, 02:18 PM
Replies: 66
Views: 2,962
Posted By guy153

Good question. In English the stress is either on...

Good question. In English the stress is either on the second to last syllable or the third to last, if the second to last is short (actually that's the rule for Latin, English is probably more...
01-04-20, 04:27 AM
Replies: 36
Views: 3,356
Posted By guy153

Yes indeed, although for bike frames you often...

Yes indeed, although for bike frames you often use a mild steel rod, which is a bit weaker but more ductile. A bit weaker is OK so long as you have a little bit of thickness in the fillet.


...
Forum: Touring
12-29-19, 02:30 PM
Replies: 14
Views: 1,191
Posted By guy153

The Garmin Oregon does all those things. Will run...

The Garmin Oregon does all those things. Will run all day on a freshly charged set of AA batteries, has an optional handlebar clip and is waterproof. They've added a bunch of fitness crap and other...
12-21-19, 01:08 PM
Replies: 150
Views: 19,468
Posted By guy153

The thickness looks about right. Cromoly bike...

The thickness looks about right. Cromoly bike tubes are usually 0.8mm or 0.9mm at the ends which that probably is. The ratio you might be talking about is 50:1 diameter to wall thickness which is a...
12-20-19, 03:05 PM
Replies: 150
Views: 19,468
Posted By guy153

I think you would still get those ripples. If you...

I think you would still get those ripples. If you just weld one bike tube to another and try to break it off there's usually lots of bending before anything breaks. Actually a good test would be to...
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