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Search: Posts Made By: guy153
Showing results 1 to 50 of 1000
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Forum: Singlespeed & Fixed Gear
09-19-24, 01:19 AM
Replies: 13
Views: 544
Posted By guy153

Hadn't thought of that... But would it fold up?...

Hadn't thought of that... But would it fold up? All that happens if you try to coast when fixed is it basically forces you into not coasting. Everything is still turning and it should be fine no?
Forum: Singlespeed & Fixed Gear
09-18-24, 10:45 AM
Replies: 13
Views: 544
Posted By guy153

I wonder if anyone has ever made a fixed-gear...

I wonder if anyone has ever made a fixed-gear with clutch that you can disengage downhills. If you had such a thing you could even have a derailleur, and use the clutch when you change gear (just as...
Forum: Singlespeed & Fixed Gear
09-16-24, 02:28 AM
Replies: 13
Views: 791
Posted By guy153

This is the most recent one (which is a fixed...

This is the most recent one (which is a fixed gear). I'm loving riding this thing!

https://www.bikeforums.net/23270201-post462.html
Forum: Singlespeed & Fixed Gear
09-15-24, 05:51 AM
Replies: 13
Views: 791
Posted By guy153

Weight: 82kg Riding style: Party pace Bikes:...

Weight: 82kg
Riding style: Party pace
Bikes: 1999 Peugeot "Competition" with Columbus Thron tubing, 2008 Trek 520 Tourer ("Trek Cromoly"), 2012-ish Whyte hardtail MTB (Hydroformed Al frame)....
Forum: Singlespeed & Fixed Gear
09-14-24, 03:29 PM
Replies: 13
Views: 791
Posted By guy153

Almost every commercial bike I've owned suffered...

Almost every commercial bike I've owned suffered from the seat post slipping down. I didn't know about carbon paste and ended up using things like linseed oil (which goes sticky). Then I started...
Forum: Framebuilders
09-14-24, 03:21 PM
Replies: 6
Views: 296
Posted By guy153

My homemade stand is certainly inferior to a Park...

My homemade stand is certainly inferior to a Park one :)
Forum: Framebuilders
09-14-24, 03:32 AM
Replies: 6
Views: 296
Posted By guy153

Had to google for what a lacing stand even is....

Had to google for what a lacing stand even is. Obviously I have a home-made truing stand (how could anyone with a welder resist making such a thing).
Forum: Framebuilders
08-30-24, 08:11 AM
Replies: 6
Views: 445
Posted By guy153

Adding a disk tab to a road fork is much more...

Adding a disk tab to a road fork is much more risky. But putting one on at the back as you're suggesting should be OK. You can always add a bridge tube between the chain stay and seat stay for some...
Forum: Framebuilders
08-30-24, 07:59 AM
Replies: 1
Views: 171
Posted By guy153

Yes I enjoyed that series! Tempted to make one...

Yes I enjoyed that series! Tempted to make one myself... The results were not exactly what I expected. I didn't think negative trail would be rideable at all.
Forum: Framebuilders
08-30-24, 01:28 AM
Replies: 11
Views: 656
Posted By guy153

They're chrome-manganese-molybdenum, and yes,...

They're chrome-manganese-molybdenum, and yes, unlike 531/753, they can be TIG welded. Not only that, the welding process is supposed to make them stronger ("air-hardening").

The price-list I have...
Forum: Framebuilders
08-29-24, 03:13 PM
Replies: 11
Views: 656
Posted By guy153

There was also mention of magnesium on there! But...

There was also mention of magnesium on there! But all they're really doing with these as far as I can see is selling you a sticker along with a tube they bought from somebody else. With the steel...
Forum: Framebuilders
08-29-24, 08:33 AM
Replies: 11
Views: 656
Posted By guy153

I never even knew they supplied Aluminium tubes!

I never even knew they supplied Aluminium tubes!
Forum: Framebuilders
08-25-24, 03:40 PM
Replies: 11
Views: 656
Posted By guy153

921 was a cold-drawn tube according to the doc I...

921 was a cold-drawn tube according to the doc I have (I won't post a picture because it says "Confidential"). It says 931 was sometimes welded sometimes seamless. 953 always welded (it's too strong...
Forum: Framebuilders
08-25-24, 02:16 PM
Replies: 11
Views: 656
Posted By guy153

I guess it might be because nobody else wants...

I guess it might be because nobody else wants tubes. Although they make tubes they're just butting fatter tubes they buy in. But the 953 alloy is mostly used for armour plating which will be sheets.
Forum: Framebuilders
08-25-24, 01:08 PM
Replies: 11
Views: 656
Posted By guy153

Reynolds tubing presentation

Key points (as far as I can remember):

They're not making 953 any more (they can't afford to buy another 10 tonnes of the stuff in which is the minimum order).
Or 921 (nobody really wants it...
Forum: Framebuilders
08-20-24, 02:18 AM
Replies: 8
Views: 429
Posted By guy153

Good point, but even if the tubes aren't metric...

Good point, but even if the tubes aren't metric there's often a seat lug or external butting providing reinforcement at the top.
Forum: Framebuilders
08-19-24, 06:37 AM
Replies: 8
Views: 429
Posted By guy153

You might get away with it but I wouldn't...

You might get away with it but I wouldn't recommend it. You'd be removing 0.2mm of material which might leave you with 1mm or less of wall thickness. Frames do fail in this area due to the cantilever...
Forum: Singlespeed & Fixed Gear
08-06-24, 04:10 AM
Replies: 21
Views: 1,048
Posted By guy153

Flip it for $140 and work your way up to a Wabi...

Flip it for $140 and work your way up to a Wabi that way?

I would get a bigger sprocket and try it for a bit now that you have it. You could put a freewheel on but IMO that's missing out most of...
Forum: Singlespeed & Fixed Gear
07-29-24, 04:53 AM
Replies: 110
Views: 14,207
Posted By guy153

How are you tensioning the chain on that though?

How are you tensioning the chain on that though?
Forum: Singlespeed & Fixed Gear
07-17-24, 10:18 AM
Replies: 15
Views: 1,242
Posted By guy153

I ride a 48/19 with 165mm cranks, which is a bit...

I ride a 48/19 with 165mm cranks, which is a bit higher geared than your 42/17 even with the shorter crank (overall gain of 5.2 compared to 4.9). This can just about cover a speed range for me...
Forum: Framebuilders
07-11-24, 09:28 AM
Replies: 11
Views: 708
Posted By guy153

I can't really see a solution here other than...

I can't really see a solution here other than slightly narrower tyres, a different frame, or smaller wheels! Especially the fork as you say. You could cut bits out of it and weld plates over them....
Forum: Framebuilders
07-07-24, 09:04 AM
Replies: 10
Views: 659
Posted By guy153

My last two builds were fixed gears with...

My last two builds were fixed gears with horizontal track-ends. I decided the slot should continue the line of the chainstay, for aesthetic reasons and to allow for maximum tensioning adjustment...
Forum: Framebuilders
07-07-24, 04:15 AM
Replies: 10
Views: 659
Posted By guy153

My (homemade) CAD software spits out what the...

My (homemade) CAD software spits out what the angle between the CS centre-line and horizontal should be (it was 9.7 degrees on the last build). I then measure how high up off the table my dummy rear...
Forum: Framebuilders
07-06-24, 09:55 AM
Replies: 8
Views: 592
Posted By guy153

Cromor is seamed, but only before the last few...

Cromor is seamed, but only before the last few drawing stages and butting. I think it's basically what a metal shop would call "drawn over mandrel" or DOM tubing as opposed to "cold drawn seamless"....
Forum: Framebuilders
07-04-24, 01:18 AM
Replies: 22
Views: 2,206
Posted By guy153

Here's the thread about my minimal jig. But...

Here's the thread about my minimal jig. But something I wanted to add. I use a laser level as illustrated in that thread. But I also check the HT and ST are aligned by eye. You look down the frame,...
Forum: Bicycle Mechanics
07-02-24, 02:32 AM
Replies: 33
Views: 1,570
Posted By guy153

I think "track ends" (such as you might have on a...

I think "track ends" (such as you might have on a track bike, or fixed gear) are already technically not called "dropouts". However, with the the thru-axle, once you have removed it, the wheel does...
Forum: Framebuilders
06-28-24, 03:47 PM
Replies: 31
Views: 1,582
Posted By guy153

I've TIGged worse :) Don't know about brazing.

I've TIGged worse :) Don't know about brazing.
Forum: Framebuilders
06-27-24, 08:52 AM
Replies: 31
Views: 1,922
Posted By guy153

In 1980-86 they were buying in tubes as John...

In 1980-86 they were buying in tubes as John Thompson said. But in the late 90s they were drawing and butting, not just laser cutting:

"They brought in lengths of straight gauge cromoly tubing,...
Forum: Framebuilders
06-27-24, 04:53 AM
Replies: 31
Views: 1,922
Posted By guy153

Yes good point. When I say "they" I guess I mean...

Yes good point. When I say "they" I guess I mean "somebody in China" who may also be making the Trek 520 etc. etc. As for whether a bike company is making their own tubing we did see in that thread...
Forum: Framebuilders
06-27-24, 03:09 AM
Replies: 31
Views: 1,922
Posted By guy153

I think they are making their own tubing (in the...

I think they are making their own tubing (in the sense of butting it themselves from shorter, fatter, thicker pieces of standard CrMo tube). They call it "Kona butted cromoly".
Forum: Framebuilders
06-26-24, 05:48 AM
Replies: 31
Views: 1,922
Posted By guy153

I think that sounds like the problem then. Either...

I think that sounds like the problem then. Either a steel sleeve that was brazed in or an externally butted seat tube would be better. The simple aluminium sleeve probably saves them doing any...
Forum: Framebuilders
06-25-24, 02:39 AM
Replies: 31
Views: 1,922
Posted By guy153

But it's the ST that's failed, not the SS or the...

But it's the ST that's failed, not the SS or the welds. I suspect lack of reinforcement (no external butting or sleeve) and flexing of the tube from the seatpost mainly contributing to the failure....
Forum: Framebuilders
06-25-24, 01:06 AM
Replies: 31
Views: 1,922
Posted By guy153

Ah I think I get it. If the ST is not thick...

Ah I think I get it. If the ST is not thick enough at the top, the flexing of the seatpost in the frame is what leads to fatigue failures, which can start at the hole at the bottom of the slot, or at...
Forum: Framebuilders
06-24-24, 03:32 PM
Replies: 31
Views: 1,922
Posted By guy153

Get them to replace it under warranty at once. ...

Get them to replace it under warranty at once.

Very strange looking failure (to me anyway). The seat tube is the much thicker tube here but appears to have cracked all the way through. The welds...
Forum: Framebuilders
06-23-24, 12:08 AM
Replies: 27
Views: 2,031
Posted By guy153

Have only made TIG forks so don't have any...

Have only made TIG forks so don't have any suggestions about brazing. Yes double-check everything with a wheel in there while it's still tacked. 270mm can't be right. The (shop-bought) fork on my...
Forum: Framebuilders
06-22-24, 01:25 AM
Replies: 6
Views: 595
Posted By guy153

Having seen a couple of videos of the Reynolds...

Having seen a couple of videos of the Reynolds factory, the butting machine is just something about the size of a car. It doesn't surprise me that if you had sufficient volume it would be cheaper to...
Forum: Singlespeed & Fixed Gear
06-21-24, 02:31 AM
Replies: 70
Views: 10,535
Posted By guy153

My theory is that every time Shimagnolosram add...

My theory is that every time Shimagnolosram add another cog to their cassettes a few more thousand people switch to fixed gear. With a 48/19 I can get up all the hills near where I live and I get...
Forum: Singlespeed & Fixed Gear
06-19-24, 03:43 AM
Replies: 110
Views: 14,207
Posted By guy153

Cross-posting from the framebuilder's forum: ...

Cross-posting from the framebuilder's forum:

https://www.bikeforums.net/23270201-post462.html
Forum: Framebuilders
06-17-24, 12:59 AM
Replies: 33
Views: 1,772
Posted By guy153

I thought the same. Maybe for some reason the...

I thought the same. Maybe for some reason the builder had "round-oval-round" stays instead of the usual oval ones he was used to. So he just squished them a bit in a vice. But I could be wrong. Seems...
Forum: Framebuilders
06-17-24, 12:48 AM
Replies: 466
Views: 327,590
Posted By guy153

https://cimg2.ibsrv.net/gimg/bikeforums.net-vbulle...

https://cimg2.ibsrv.net/gimg/bikeforums.net-vbulletin/2000x1504/05b_83418176de783591c7e3d67be1b987a6b386514b.jpg

Frame #11, seen here about to emerge from the garage in which it was created. My...
Forum: Framebuilders
05-17-24, 09:05 AM
Replies: 52
Views: 2,924
Posted By guy153

Never had the nipple wedged like that, but...

Never had the nipple wedged like that, but sometimes they do fall in and get stuck between the two "skins". You have to shake the rim around until they fall out of the spoke hole eventually.
...
Forum: Framebuilders
05-16-24, 05:11 AM
Replies: 52
Views: 2,924
Posted By guy153

You can true a wheel with something like a fork...

You can true a wheel with something like a fork to hold it in. But don't just eyeball that huge gap on that enormous fork-- hold a piece of card against it right up close to the rim and you can see...
Forum: Framebuilders
05-10-24, 02:49 AM
Replies: 52
Views: 2,924
Posted By guy153

You don't need to heat-treat 4130 unless it's...

You don't need to heat-treat 4130 unless it's thicker than about 1/8" or so. I wouldn't bother with belt-drive. Very expensive and also means you need a gearbox or internal gear hub (often quite...
Forum: Framebuilders
05-10-24, 02:46 AM
Replies: 52
Views: 2,924
Posted By guy153

IME if you TIG weld on a 40mm shell you can...

IME if you TIG weld on a 40mm shell you can usually get away without chasing. But on a 38.1 you will need to (I do now have a pair of the taps which I found surprisingly cheaply somewhere).



...
Forum: Framebuilders
05-10-24, 02:28 AM
Replies: 52
Views: 2,924
Posted By guy153

I don't know much about stick and am hopeless at...

I don't know much about stick and am hopeless at it but I think 6013 is designed to give low penetration and therefore be easier to use on thin metal.

BTW I highly recommend this YT channel....
Forum: Framebuilders
05-10-24, 02:18 AM
Replies: 17
Views: 1,145
Posted By guy153

OK some frame features I don't really like (for...

OK some frame features I don't really like (for reasons of personal aesthetics and in some cases possibly the age I was when they were invented):

1. Eccentric BB shells
2. Curved seat-tubes in...
Forum: Framebuilders
05-09-24, 12:54 AM
Replies: 59
Views: 4,175
Posted By guy153

These are all great points. No filler on 853...

These are all great points. No filler on 853 (which would make a weaker joint, even if it was technically "strong" after dividing by the thickness) and you also need to use ER80 filler on 631 to...
Forum: Framebuilders
05-08-24, 09:00 AM
Replies: 59
Views: 4,175
Posted By guy153

There's this diagram in the Columbus catalogue...

There's this diagram in the Columbus catalogue which shows where the weak and strong regions are in the HAZ (for regular cromoly and their superduper new omnicrom).
...
Forum: Framebuilders
05-05-24, 08:34 AM
Replies: 52
Views: 2,924
Posted By guy153

I doubt Ceeway will have any head tubes in...

I doubt Ceeway will have any head tubes in anything other than the much thinner walls you would use for building a medium or high-end road bike (they stock Columbus tubing). But if you can find...
Forum: Framebuilders
05-05-24, 06:22 AM
Replies: 52
Views: 2,924
Posted By guy153

So how does it steer? Are the two forks at the...

So how does it steer? Are the two forks at the front fixed, and the whole front end rotates around the bicycle's steerer tube? Or do you make that joint rigid, link the forks together, and have them...
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