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Search: Posts Made By: smasha
Showing results 1 to 50 of 1000
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Forum: Bicycle Mechanics
09-03-24, 05:35 AM
Replies: 26
Views: 818
Posted By smasha

There's also "dynamic braking", which may be a...

There's also "dynamic braking", which may be a railroad term - https://www.trains.com/trn/train-basics/abcs-of-railroading/dynamic-braking-101/
Forum: Bicycle Mechanics
09-03-24, 05:27 AM
Replies: 26
Views: 818
Posted By smasha

I think these are 4-piston calipers with wide...

I think these are 4-piston calipers with wide pads: Deore XT BR-M8120, Saint BR-M820, Magura MT5 or MT7, SRAM Guide RE, Tektro HD-M745, Tektro TRP G-Spec Slate.



What I've seen, the limiting...
Forum: Bicycle Mechanics
09-01-24, 07:51 PM
Replies: 26
Views: 818
Posted By smasha

I get that, but... There's a difference between...

I get that, but... There's a difference between abrasive braking forces and adhesive braking forces. Part of modern material design is (or should be?) to minimise abrasive braking forces and maximise...
Forum: Bicycle Mechanics
09-01-24, 07:43 PM
Replies: 12
Views: 495
Posted By smasha

Wow... I guess that explains why there's...

Wow...


I guess that explains why there's no functional/security benefit ascribed to it.

I would've thought that Abus wasn't playing the "pure marketing nonsense" game, but there it is.

As...
Forum: Bicycle Mechanics
09-01-24, 07:12 PM
Replies: 12
Views: 495
Posted By smasha

If that's the case, then it makes no difference...

If that's the case, then it makes no difference when the lock is properly used, and there's no space to get a jack inside the lock.
Forum: Bicycle Mechanics
09-01-24, 07:08 PM
Replies: 26
Views: 818
Posted By smasha

I think I have the right size rotors. IIUC,...

I think I have the right size rotors. IIUC, larger rotors can cause herky-jerky braking (that's the correct technical term, right?) in slower stop-and-go city riding. As I understand it, the...
Forum: Bicycle Mechanics
09-01-24, 06:58 PM
Replies: 26
Views: 818
Posted By smasha

Partly it's a case of upgradeitis. There's...

Partly it's a case of upgradeitis. There's nothing really wrong with the non-series 2-piston brakes I have, which use HB59 hoses. That said, there are some descents I'd encounter on a tour that may...
Forum: Bicycle Mechanics
09-01-24, 06:36 PM
Replies: 26
Views: 818
Posted By smasha

1- Although not officially recommended, is there...

1- Although not officially recommended, is there any real reason not to use a "wide" rotor with "narrow" pads? Save a few grams, sure, but does anything bad happen?

2- I've seen no evidence or...
Forum: Bicycle Mechanics
09-01-24, 06:21 PM
Replies: 26
Views: 818
Posted By smasha

That assumes that both systems use pads with...

That assumes that both systems use pads with same/comparable surface area; I'm not sure if that's the case.

But flipping that observation around: All other factors considered, a narrow pad...
Forum: Bicycle Mechanics
09-01-24, 06:17 PM
Replies: 26
Views: 818
Posted By smasha

I'm considering new calipers. Moving from a...

I'm considering new calipers. Moving from a 2-piston to a 4-piston system is widely considered an upgrade, but if it entails changing from a wide-profile pad/rotor interface to a narrow pad/rotor...
Forum: Bicycle Mechanics
09-01-24, 09:53 AM
Replies: 26
Views: 818
Posted By smasha

So far, the only noise (ie comments that don't...

So far, the only noise (ie comments that don't answer the question) is from you.
Forum: Bicycle Mechanics
09-01-24, 09:35 AM
Replies: 26
Views: 818
Posted By smasha

For a grocery and touring bike (ie heavy loads)...

For a grocery and touring bike (ie heavy loads) on hilly terrain, this can be an issue. Especially where good quality rotors can easily cost about $100 each in local currency.

The mechanics of it...
Forum: Bicycle Mechanics
09-01-24, 09:20 AM
Replies: 12
Views: 495
Posted By smasha

Pictured: Abus 540. The highlighted section...

Pictured: Abus 540.

The highlighted section is what I think they're referring to as the parabolic shackle. How that's stronger than a simple round curve used on most/all other U-locks... I can't...
Forum: Bicycle Mechanics
09-01-24, 09:06 AM
Replies: 26
Views: 818
Posted By smasha

Brake pads & rotors - Wide vs narrow longevity

- https://www.cyclabo.com/topics/xvflg0s8ae/

What I want to know... With other factors being equal (eg pad material, rotor material, bike and rider weight, terrain, weather, riding style), does...
Forum: Bicycle Mechanics
08-27-24, 11:20 AM
Replies: 12
Views: 495
Posted By smasha

Parabolic shackle U-locks

There's no lock section, so I guess most of engineering discussion is in mechanics?

Anyway, Abus markets their U-locks with "parabolic shackles" as a feature. I think this refers to the shape of...
Forum: Electronics, Lighting, & Gadgets
06-13-24, 05:29 AM
Replies: 0
Views: 234
Posted By smasha

WTB, dead or alive - Old Niteflux lights

WTB, dead or alive, old Niteflux Red-Zone and White-Zone lights.

Let me know what you have.
...
Forum: Commuting
03-03-24, 07:39 PM
Replies: 17
Views: 1,490
Posted By smasha

Saddle covers - disposable plastic shopping bags

Disposable plastic shopping bags make great saddle covers, to protect our beloved saddles from rain, sun, pigeon-crap, and covetous eyes. But disposable plastic shopping bags are now unpopular, and...
Forum: Touring
09-03-23, 08:47 AM
Replies: 49
Views: 5,628
Posted By smasha

Planning my first real tour, and this thread...

Planning my first real tour, and this thread found me.

As a baseline, I use a heavy U-lock *and* a heavy chain when I commute into "the city" and leave my bike locked up and unsupervised for about...
Forum: Touring
07-08-23, 01:11 AM
Replies: 21
Views: 1,895
Posted By smasha

An old foam yoga mat can be cut down to any...

An old foam yoga mat can be cut down to any size/shape. They're about $10 new, for cheap ones. For the fiscally/environmentally conservative, ask around at yoga studios, if anyone left behind an old...
Forum: Hybrid Bicycles
03-28-23, 09:38 AM
Replies: 2,221
Views: 883,222
Posted By smasha

RD-M5120 is working well with this setup, on...

RD-M5120 is working well with this setup, on another bike. Specs say 2x, but no problems at all with a 3x.

If I could find a 3x9 crankset with a 20 or 22T low gear, I'd consider that, but the...
Forum: Hybrid Bicycles
03-20-23, 09:24 PM
Replies: 2,221
Views: 883,222
Posted By smasha

Gravel bikes tend to be drop-bar, which tends to...

Gravel bikes tend to be drop-bar, which tends to change the geometry. Perhaps more importantly, the only gravel-bike I can think of with a fork that would be good for a low-rider rack is the Giant...
Forum: Hybrid Bicycles
03-20-23, 05:19 AM
Replies: 2,221
Views: 883,222
Posted By smasha

Still keeping a lookout for a used FX2... ...

Still keeping a lookout for a used FX2...

Was 2019/2020 when the cable routing along the down-tube changed from external to internal?

Any changes to the fork, before, during, or after that...
Forum: Bicycle Mechanics
03-16-23, 06:00 PM
Replies: 113
Views: 9,443
Posted By smasha

Not my area of expertise, but as I understand it,...

Not my area of expertise, but as I understand it, titanium needs to be welded in an oxygen-free environment.
Forum: Bicycle Mechanics
03-16-23, 08:23 AM
Replies: 113
Views: 9,443
Posted By smasha

Not sure what's worse... GPT's mechanical...

Not sure what's worse... GPT's mechanical analysis or its poetry...

The pannier hangs upon the fork,
But how it's mounted is the talk.
Two methods vie for strength and might,
Each offering its...
Forum: Bicycle Mechanics
03-15-23, 10:07 PM
Replies: 113
Views: 9,443
Posted By smasha

Yes and no. For the purposes of calculating...

Yes and no. For the purposes of calculating stresses and forces, it's all about dynamic load. At some point, I need to translate that safe dynamic load into a static load, ie how heavy can I safely...
Forum: Bicycle Mechanics
03-15-23, 09:18 AM
Replies: 113
Views: 9,443
Posted By smasha

ChatGPT says it's ok, so it must be ok, right...?...

ChatGPT says it's ok, so it must be ok, right...?
:lol: :foo:



With different incarnations of GPT, it's telling me the safe static load (accounting for cyclic loading and vibration) is...
Forum: Bicycle Mechanics
03-15-23, 05:44 AM
Replies: 113
Views: 9,443
Posted By smasha

The Trek FX2 fork is on my radar, if I can't find...

The Trek FX2 fork is on my radar, if I can't find a good solution with the Escape/ Cross City fork. I like aluminium.

As I understand your explanation, it doesn't even need a bolt. A cable, under...
Forum: Bicycle Mechanics
03-15-23, 04:06 AM
Replies: 113
Views: 9,443
Posted By smasha

The spacers that came with my stainless Tubus...

The spacers that came with my stainless Tubus rack are stainless. So far as they need to withstand a compression force of the bolt, they are structural. I don't think I've ever seen a rack that came...
Forum: Bicycle Mechanics
03-14-23, 07:56 PM
Replies: 113
Views: 9,443
Posted By smasha

That's kind of my point; if an 8mm spacer over a...

That's kind of my point; if an 8mm spacer over a bolt is suitable for this task, then is ≈7mm of bolt without a spacer suitable for this task? Does it change the equation if part of that bolt is...
Forum: Bicycle Mechanics
03-14-23, 06:30 PM
Replies: 113
Views: 9,443
Posted By smasha

This mostly makes sense to me. The part that...

This mostly makes sense to me.

The part that doesn't make sense is this: Most/all (non-carbon) forks that "properly" support a rack require a standoff/spacer between the lower rack flange and the...
Forum: Bicycle Mechanics
03-14-23, 07:52 AM
Replies: 113
Views: 9,443
Posted By smasha

I intend to stay within the 18kg rated limit of...

I intend to stay within the 18kg rated limit of the rack (9kg per side), if that's what you mean by not overloading it.

I ride Schwalbe Marathons, so flats are rare, and I have the gear and...
Forum: Bicycle Mechanics
03-14-23, 07:04 AM
Replies: 113
Views: 9,443
Posted By smasha

Maybe this is a viable (safe) solution, using the...

Maybe this is a viable (safe) solution, using the Escape/ Cross City fork?

This was mentioned previously, but I just now got a chance to mock it up. I'd probably use a nylock nut, and all...
Forum: Bicycle Mechanics
03-14-23, 06:42 AM
Replies: 113
Views: 9,443
Posted By smasha

Because I like aluminium bikes. For how/where I...

Because I like aluminium bikes. For how/where I ride, they appeal to me more than steel or carbon fibre,

If I had $5-10k to spend on a commuter/city bike, I'd seriously consider titanium. Of...
Forum: Bicycle Mechanics
03-14-23, 06:37 AM
Replies: 113
Views: 9,443
Posted By smasha

That's cool, but shear-strength of a bolt matters...

That's cool, but shear-strength of a bolt matters when the two surfaces held together by that bolt are (a) perpendicular to the bolt and (b) flush, and (c) the forces are perpendicular to the length...
Forum: Hybrid Bicycles
03-13-23, 07:30 PM
Replies: 2,221
Views: 883,222
Posted By smasha

As I expected, a new FX2 fork is about the same...

As I expected, a new FX2 fork is about the same price as a used FX2, and won't be available for a couple of months. This is pushing me towards just looking for a used FX2.

Maybe my next bike will...
Forum: Bicycle Mechanics
03-13-23, 06:27 PM
Replies: 113
Views: 9,443
Posted By smasha

The Surly forks look good, except I'm looking for...

The Surly forks look good, except I'm looking for aluminium.
Forum: Hybrid Bicycles
03-13-23, 08:18 AM
Replies: 2,221
Views: 883,222
Posted By smasha

Absolutely worth asking. But even if it is...

Absolutely worth asking. But even if it is available, it'll probably cost as much as a used FX2. I'll ask some local shops, anyway. Never know, they may have an extra one.

The large FX2 head-tube...
Forum: Hybrid Bicycles
03-13-23, 06:59 AM
Replies: 2,221
Views: 883,222
Posted By smasha

Oh, and about the fork, yeah. I can only make...

Oh, and about the fork, yeah. I can only make inferences from pictures and videos, but it looks like the fork should be fine with wider tires, and if there is a limitation it's in the chain-stays....
Forum: Hybrid Bicycles
03-13-23, 06:53 AM
Replies: 2,221
Views: 883,222
Posted By smasha

The Verve series are a bit too cruiser geometry...

The Verve series are a bit too cruiser geometry for me, and they all have threaded headsets.

For longer rides, I've got a flat-bar upright-posture touring bike that's well equipped for groceries...
Forum: Bicycle Mechanics
03-13-23, 06:35 AM
Replies: 113
Views: 9,443
Posted By smasha

if I have a 5mm bolt inside of a standoff with an...

if I have a 5mm bolt inside of a standoff with an 8mm OD, and all faces/surfaces are flush, and there's a load perpendicular to the bolt... I'd expect the standoff to transfer some of the leverage...
Forum: Bicycle Mechanics
03-13-23, 06:29 AM
Replies: 113
Views: 9,443
Posted By smasha

You're the second person today (first person...

You're the second person today (first person here) who mentioned post-welding heat treatment.

For a city-bike, a can of spray-paint might do for painting. Or I might wind up with a Trek FX2 fork...
Forum: Hybrid Bicycles
03-12-23, 06:52 PM
Replies: 2,221
Views: 883,222
Posted By smasha

My requirements for a fork are: Front rack...

My requirements for a fork are: Front rack compatible, aluminium, non-suspension, 700c, and overall suited for touring/grocery. Of course it has to be something I can find locally, which further...
Forum: Hybrid Bicycles
03-12-23, 09:27 AM
Replies: 2,221
Views: 883,222
Posted By smasha

I don't need the weight or complexity of...

I don't need the weight or complexity of suspension forks, and they tend to not work with a low-rider front-rack (especially a rack like the Tara, with a hoop over the wheel). Otherwise, those bikes...
Forum: Hybrid Bicycles
03-12-23, 07:19 AM
Replies: 2,221
Views: 883,222
Posted By smasha

If it were that easy... The big thing I'm...

If it were that easy...

The big thing I'm looking for that's not fashionable on current off-the-shelf bikes is a 3x10 drive-train, with 40-30-22 crankset and 11-42 cassette. This gives me a gear...
Forum: Hybrid Bicycles
03-11-23, 07:32 PM
Replies: 2,221
Views: 883,222
Posted By smasha

Greeting to all of the Trek FX experts! I'm...

Greeting to all of the Trek FX experts!

I'm trying to build up a city/grocery/hill bike, and hit a snag with the Giant Cross City (aka Escape) 2 that I started with -...
Forum: Bicycle Mechanics
03-11-23, 01:42 AM
Replies: 113
Views: 9,443
Posted By smasha

Wondering if I should change this project from a...

Wondering if I should change this project from a a Giant Cross City (aka Escape) 2 to a Trek FX 2. Seems like very similar geometry, designed for a very similar riding.

The specs for the FX2 say...
Forum: Bicycle Mechanics
03-10-23, 11:39 PM
Replies: 113
Views: 9,443
Posted By smasha

Across the radius of where the crush washer would...

Across the radius of where the crush washer would fit, one side would have about a 2mm gap while the other side comes into contact with the fork. I think that's not going to work.

I'm not worried...
Forum: Bicycle Mechanics
03-10-23, 11:17 PM
Replies: 113
Views: 9,443
Posted By smasha

I know, I know... Just call me Mr Conservative.

I know, I know... Just call me Mr Conservative.
Forum: Bicycle Mechanics
03-10-23, 01:33 AM
Replies: 113
Views: 9,443
Posted By smasha

Just put half a washer under the bolt? I was...

Just put half a washer under the bolt? I was thinking about that, but if the bolt loosens itself, I'd lose that half-washer. It's a high maintenance solution, and it still wouldn't sit flush.
Forum: Bicycle Mechanics
03-10-23, 01:31 AM
Replies: 113
Views: 9,443
Posted By smasha

What fork is that?

What fork is that?
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