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Search: Posts Made By: Jonneh
Showing results 1 to 50 of 84
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Forum: Bicycle Mechanics
07-18-23, 09:08 AM
Replies: 12
Views: 569
Posted By Jonneh

Indeed, that was the plan, but I'm sure...

Indeed, that was the plan, but I'm sure crankycrank is right that even 0.25mm out on either side is too much if I want to maintain precise shifting.

I don't think I'm overthinking ratios (I ride a...
Forum: Bicycle Mechanics
07-15-23, 10:52 AM
Replies: 12
Views: 569
Posted By Jonneh

Ah, that's too bad. I don't have a good handle on...

Ah, that's too bad. I don't have a good handle on how much of a difference a fraction of a mm here or there will make, but I'm sure you're right.

Indeed I don't have a MTB 11-speed to hand to play...
Forum: Bicycle Mechanics
07-15-23, 04:05 AM
Replies: 12
Views: 569
Posted By Jonneh

11-speed MTB cassette (minus top cog) on 10-speed road bike

I am looking to use an 11-speed mountain bike cassette with the 11T cog removed on my 10-speed road bike to get the gear spacing and range I'm after. From what I can see from charts, sprocket width...
Forum: Bicycle Mechanics
12-07-21, 09:37 AM
Replies: 12
Views: 1,371
Posted By Jonneh

This was an excellent test of a bunch of...

This was an excellent test of a bunch of sealants: https://www.slowtwitch.com/Products/Things_that_Roll/Tires/Sealant_Test_-_Part_2_4155.html

Bontrager TLR came out on top, closely followed by...
Forum: Bicycle Mechanics
12-06-21, 05:10 AM
Replies: 10
Views: 1,040
Posted By Jonneh

100%. You're good to go.

100%. You're good to go.
Forum: Bicycle Mechanics
11-26-21, 06:45 AM
Replies: 41
Views: 3,999
Posted By Jonneh

That's interesting, and frankly, reassuring. I've...

That's interesting, and frankly, reassuring. I've been using a KCNC post with a similar (but clearly sufficiently different) design for years now without problem. Each yoke has a pretty substantial...
Forum: Bicycle Mechanics
11-24-21, 07:17 AM
Replies: 41
Views: 3,999
Posted By Jonneh

A final thing to keep in mind is the retention...

A final thing to keep in mind is the retention mechanism on the Look seatpost clamp: it uses a binding bolt similar to this one but split symmetrically. I don't think this is the best design for...
Forum: Bicycle Mechanics
11-24-21, 06:53 AM
Replies: 41
Views: 3,999
Posted By Jonneh

Thanks for the various musings Clifford. My...

Thanks for the various musings Clifford. My thoughts at the moment are leaning towards idea (1) rather than the mast idea (4) for reasons of elegance: as you say, the mast could end up quite unwieldy...
Forum: Bicycle Mechanics
11-24-21, 06:45 AM
Replies: 41
Views: 3,999
Posted By Jonneh

That's good to know. I'm curious about how...

That's good to know. I'm curious about how exactly it failed---did the pin start compressing the edges of the holes in the CF tube? If so, do you remember the approximate wall thickness of the post?
Forum: Singlespeed & Fixed Gear
11-24-21, 06:39 AM
Replies: 6
Views: 1,142
Posted By Jonneh

From both of you being screwed to neither of you....

From both of you being screwed to neither of you. Either way, you and the cog are in this together.
Forum: Bicycle Mechanics
11-21-21, 12:45 AM
Replies: 27
Views: 2,258
Posted By Jonneh

Oops! I deleted my post by accident while trying...

Oops! I deleted my post by accident while trying to edit it, and now you're quoting a non-existent post. Anyway, it's true that the solid ring has a narrower inner circle than a typical 38T...
Forum: Singlespeed & Fixed Gear
11-20-21, 03:45 PM
Replies: 15
Views: 1,800
Posted By Jonneh

Lots of cans of juicy worms opened with these...

Lots of cans of juicy worms opened with these points, but to keep it brief:

1) Re the sharp curve in the drops, this is somewhat hard to imagine. Do you have a picture of the bars in question (or...
Forum: Singlespeed & Fixed Gear
11-20-21, 02:01 PM
Replies: 14
Views: 3,190
Posted By Jonneh

Too bad about the crash, but glad you're OK. The...

Too bad about the crash, but glad you're OK. The same thing happened to me once on a busy dual carriageway---I was nutted by the top tube but stayed on the bike. Could have been a lot worse.

All...
Forum: Singlespeed & Fixed Gear
11-20-21, 09:24 AM
Replies: 29
Views: 6,369
Posted By Jonneh

We might be talking about different things. As an...

We might be talking about different things. As an example, the bars on my fixed gear are the Ritchey Comp EvoCurve. They stay fat until the (second) curve that begins the fall into the drops:...
Forum: Singlespeed & Fixed Gear
11-20-21, 08:10 AM
Replies: 29
Views: 6,369
Posted By Jonneh

That's certainly true, but many bars keep the...

That's certainly true, but many bars keep the clamping diameter until the bar curves. A 31.8 bar that does this is likely to be stiffer than a bar of smaller diameter, given the massive effect of...
Forum: Singlespeed & Fixed Gear
11-20-21, 07:52 AM
Replies: 7
Views: 1,743
Posted By Jonneh

I recommend the Crankbrothers Stamp 7 (large)....

I recommend the Crankbrothers Stamp 7 (large). They're made for large feet but are still low profile, light, concave, and with durable bearings. Fantastic pedals.
Forum: Bicycle Mechanics
11-20-21, 07:46 AM
Replies: 27
Views: 2,258
Posted By Jonneh

​​​​​​Undo the bolts using your tool and a 5 mm...

​​​​​​Undo the bolts using your tool and a 5 mm allen key, remove the ring, thread it back over the spider (fiver-armed thing) such that the indentations around the five holes sit on the inside...
Forum: Bicycle Mechanics
11-18-21, 01:02 AM
Replies: 41
Views: 3,999
Posted By Jonneh

From what I understand, you do have to be...

From what I understand, you do have to be careful. The epoxy used to bond the two surfaces can serve as the barrier, but one then needs a method of maintaining this separation along the length of the...
Forum: Bicycle Mechanics
11-18-21, 12:51 AM
Replies: 41
Views: 3,999
Posted By Jonneh

Cheers Andrew. My main task at the moment seems...

Cheers Andrew. My main task at the moment seems to be working out how well 2.5--3 mm multidirectional carbon can withstand compression from the cross piece in the axis of the layering. If the answer...
Forum: Bicycle Mechanics
11-17-21, 05:19 PM
Replies: 41
Views: 3,999
Posted By Jonneh

The conclusion in that thread and elsewhere was...

The conclusion in that thread and elsewhere was that at least in carbon steerers, it needs to reduce compression forces imposed by the stem (and doesn't merely serve to allow preloading), which is...
Forum: Bicycle Mechanics
11-17-21, 05:10 PM
Replies: 41
Views: 3,999
Posted By Jonneh

That thing looks great! It's pretty close to what...

That thing looks great! It's pretty close to what I had in mind, essential being a recreation of the KCNC donor with a carbon tube. Given the list of materials and tools he quotes, he doesn't seem to...
Forum: Bicycle Mechanics
11-17-21, 11:37 AM
Replies: 41
Views: 3,999
Posted By Jonneh

I know the precautionary principle is the...

I know the precautionary principle is the prevailing bias here, in contrast to other places. Perhaps that's a good thing for many, but failing being trained as an engineer, one only gains the...
Forum: Bicycle Mechanics
11-17-21, 09:59 AM
Replies: 41
Views: 3,999
Posted By Jonneh

Hehe. I don't promise to be as good an...

Hehe. I don't promise to be as good an entertainer as the lad who made a broom handle extension for his fork steerer and the inevitable happened (in all seriousness, thank god he was OK). I'll keep...
Forum: Bicycle Mechanics
11-17-21, 09:53 AM
Replies: 41
Views: 3,999
Posted By Jonneh

Thanks for the great details Andrew---these are...

Thanks for the great details Andrew---these are exactly the kinds of things that I was hoping to discuss. I don't have the carbon tube yet, so these are characteristics I'll have to select for when...
Forum: Bicycle Mechanics
11-17-21, 08:38 AM
Replies: 41
Views: 3,999
Posted By Jonneh

Brilliant, thanks! This is definitely happening....

Brilliant, thanks! This is definitely happening. (1) is looking more doable, is inherently more elegant than (2), and avoids the need for finding a seatpost with a 25.4 mm mm ID to have a perfect...
Forum: Bicycle Mechanics
11-16-21, 06:01 PM
Replies: 41
Views: 3,999
Posted By Jonneh

The trouble is that I need a 25.0 mm, which was...

The trouble is that I need a 25.0 mm, which was particular to early Look and Vitus frames (and perhaps others).
Forum: Bicycle Mechanics
11-16-21, 05:59 PM
Replies: 41
Views: 3,999
Posted By Jonneh

HillRider: I'm sure you're right, but I like...

HillRider: I'm sure you're right, but I like making stuff, even if it ends up risker and pricier. :)
Forum: Bicycle Mechanics
11-16-21, 05:04 PM
Replies: 41
Views: 3,999
Posted By Jonneh

For better or worse, I am comfortable with it,...

For better or worse, I am comfortable with it, although whether or not comfort is the best guide to safety, I'm not so sure. In any case, I'd hope to be even more comfortable after a discussion (I...
Forum: Bicycle Mechanics
11-16-21, 02:48 PM
Replies: 41
Views: 3,999
Posted By Jonneh

DIY carbon seatpost

Hi all. I'm after a zero-setback carbon seatpost for my Look KG96 (with which I'm utterly in love) and its 25.0 mm seat tube ID. Alu models I've found are either too stiff and have setback (the...
Forum: Bicycle Mechanics
04-27-21, 12:54 PM
Replies: 29
Views: 5,961
Posted By Jonneh

Just to follow up on this, I went ahead with the...

Just to follow up on this, I went ahead with the mod, all went well, and the steerer has done some 4,000 miles since its surgery.

The technique's a keeper. Thanks DaveSSS for the walkthrough.
Forum: Bicycle Mechanics
05-26-20, 01:25 PM
Replies: 5
Views: 468
Posted By Jonneh

My Ksyrium ES front wheel with the exact same...

My Ksyrium ES front wheel with the exact same problem will share a similar fate. I hope the girlfriend won't take it too badly—I'm not sure how I'd feel about receiving such crap ('fancy' though it...
Forum: Bicycle Mechanics
02-20-20, 03:28 AM
Replies: 29
Views: 5,961
Posted By Jonneh

Oh. Not on my phone or either of two browsers on...

Oh. Not on my phone or either of two browsers on my PC. Never mind.

Good to know re the foam.
Forum: Bicycle Mechanics
02-19-20, 04:43 PM
Replies: 29
Views: 5,961
Posted By Jonneh

Dave, would you mind reposting the image of your...

Dave, would you mind reposting the image of your epoxy compression plug? With your approval of my MS Paint mock-up, I think I have the right metal image, but just out of interest...

Also,...
Forum: Bicycle Mechanics
02-19-20, 02:42 PM
Replies: 23
Views: 1,151
Posted By Jonneh

Don't do it. In a parallel universe in which...

Don't do it.

In a parallel universe in which clinchers came later, they would be branded 'modular' and be touted as better in every way apart from weight. The chronology is messed up in our...
Forum: Singlespeed & Fixed Gear
02-19-20, 02:27 PM
Replies: 475
Views: 144,844
Posted By Jonneh

https://cimg8.ibsrv.net/gimg/bikeforums.net-vbulle...

https://cimg8.ibsrv.net/gimg/bikeforums.net-vbulletin/2000x1504/img_20200219_153932_2badc282fd36f5844fe7ff13525f5e8a0cd52de7.jpg
...
Forum: Bicycle Mechanics
02-19-20, 02:00 PM
Replies: 11
Views: 5,862
Posted By Jonneh

OP, you might want to see what you think of...

OP, you might want to see what you think of DaveSSS's method in this thread: https://www.bikeforums.net/bicycle-mechanics/1193593-compression-plug-oval-carbon-steerer.html. It would avoid the need...
Forum: Bicycle Mechanics
02-19-20, 01:46 PM
Replies: 8
Views: 2,064
Posted By Jonneh

Thanks for the comments Andrew (and Wizard). I...

Thanks for the comments Andrew (and Wizard). I didn't see them in time for the bonding session, and although I did clean the surfaces well (sanding followed by acetone), I didn't apply the epoxy to...
Forum: Bicycle Mechanics
02-14-20, 07:58 AM
Replies: 8
Views: 2,064
Posted By Jonneh

Good to see. Looks like I bought the right one...

Good to see. Looks like I bought the right one then, albeit not by coincidence (recommended by DaveSSS on here).

Great, I'm going to go for it, making sure to prepare the surfaces well (roughing...
Forum: Bicycle Mechanics
02-14-20, 05:19 AM
Replies: 8
Views: 2,064
Posted By Jonneh

Which epoxy for bonding bolts?

I want to glue the washers on my WI Eno hub to my frame. The replaceable derailleur hanger closes off the dropout less than its closure on the non-drive side, resulting in the washer eating into the...
Forum: Singlespeed & Fixed Gear
02-12-20, 05:40 AM
Replies: 4,938
Views: 777,294
Posted By Jonneh

Is bar-wrapping fear a thing? I'm young, but also...

Is bar-wrapping fear a thing? I'm young, but also pessimistic for the world.

Your job looks great btw.
Forum: Bicycle Mechanics
02-11-20, 07:33 PM
Replies: 29
Views: 6,449
Posted By Jonneh

I don't know the Park Tools one, but don't get...

I don't know the Park Tools one, but don't get the IceToolz one. It's crap. Badly machined with a wonky pin.
Forum: Bicycle Mechanics
02-10-20, 10:32 AM
Replies: 29
Views: 5,961
Posted By Jonneh

Excellent. That all sounds very clear. I...

Excellent. That all sounds very clear.

I make it about 20 mls that'll be required for a 50 mm section of 11 mm radius (without discounting the T nut and straw volume). Allowing 1.5 g/cm3 for the...
Forum: Bicycle Mechanics
02-10-20, 09:46 AM
Replies: 29
Views: 5,961
Posted By Jonneh

Regarding long-axis alignment of the T nut, that...

Regarding long-axis alignment of the T nut, that could probably be got right by setting the epoxy in two stages: first, by filling the space above the foam until it's just high enough to contact the...
Forum: Bicycle Mechanics
02-10-20, 09:27 AM
Replies: 29
Views: 5,961
Posted By Jonneh

Great, I'm convinced! :) The maximum...

Great, I'm convinced! :)

The maximum external diameter is 1-1/8". Because of the ovality and thick walls, the minimum internal diameter is a fair bit less. I can measure it later.

Just to check...
Forum: Bicycle Mechanics
02-10-20, 09:02 AM
Replies: 29
Views: 5,961
Posted By Jonneh

I see, sounds good. I took it for granted that...

I see, sounds good. I took it for granted that the epoxy wouldn't serve a structural funcion, and was rather there just to hold the tee nut (and therefore just for bearing preloading purposes), but...
Forum: Bicycle Mechanics
02-10-20, 08:51 AM
Replies: 29
Views: 5,961
Posted By Jonneh

In principle it's supposed to fit with ZS44/28.6...

In principle it's supposed to fit with ZS44/28.6 ZS56/40(36°) bearings. Because of weirdities with the integrated crown race, I'm using a custom-machined shim to have the correct spacing between the...
Forum: Bicycle Mechanics
02-10-20, 02:52 AM
Replies: 29
Views: 5,961
Posted By Jonneh

I take this (albeit in other words) to be a...

I take this (albeit in other words) to be a conclusion about a required function of the plug being to resist crushing forces then?
Forum: Bicycle Mechanics
02-09-20, 05:01 PM
Replies: 29
Views: 5,961
Posted By Jonneh

What's the relevance? Lots of oval steerers on...

What's the relevance? Lots of oval steerers on used frames or what?
Forum: Bicycle Mechanics
02-09-20, 02:30 PM
Replies: 29
Views: 5,961
Posted By Jonneh

Thanks to your homemade modifications, or just as...

Thanks to your homemade modifications, or just as it is? In the latter case I could just use a standard compression plug while preloading the bearings, then clamp on the stem and remove the plug. I'd...
Forum: Bicycle Mechanics
02-09-20, 11:33 AM
Replies: 29
Views: 5,961
Posted By Jonneh

Fine by me if it'll serve the purpose. A lot...

Fine by me if it'll serve the purpose.

A lot depends on whether the function of the compression plug is just to get a grip while the headset bearings are preloaded, or whether it's to resist...
Showing results 1 to 50 of 84
 
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