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Search: Posts Made By: Duragrouch
Showing results 1 to 50 of 1000
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Forum: Bicycle Mechanics
04-27-24, 11:57 PM
Replies: 10
Views: 185
Posted By Duragrouch

(above) Wow, that's worse than I expected. I...

(above) Wow, that's worse than I expected. I thought perhaps just wire exposed on the edge side, but the wire has completely separated from the sidewall. I'm surprised the tube wasn't bulging out the...
Forum: Bicycle Mechanics
04-27-24, 11:45 PM
Replies: 19
Views: 13,266
Posted By Duragrouch

The diagrams were comparing two different gearing...

The diagrams were comparing two different gearing scenarios. The key is comparing the gear-inches measurement of total gearing. Look at the difference on the high gears (rightmost triangle on each)....
Forum: Bicycle Mechanics
04-27-24, 11:30 PM
Replies: 18
Views: 351
Posted By Duragrouch

Clocking gears: I took a look at the Nexus-8...

Clocking gears: I took a look at the Nexus-8 service manual. So it appears, that there are two sets of planet gears there, side-by-side, of different diameters and number of teeth. When the gears are...
Forum: Bicycle Mechanics
04-27-24, 11:10 PM
Replies: 33
Views: 1,254
Posted By Duragrouch

(above) The part about conductivity is true, but...

(above) The part about conductivity is true, but again, for the same rim section and material, a larger rim has more heat sink so will not heat up as much as a smaller rim with less heat sink..

I...
Forum: Bicycle Mechanics
04-27-24, 11:09 PM
Replies: 33
Views: 1,254
Posted By Duragrouch

(above) The part about conductivity is true, but...

(above) The part about conductivity is true, but again, for the same rim section and material, a larger rim has more heat sink so will not heat up as much as a smaller rim with less heat sink..

I...
Forum: General Cycling Discussion
04-27-24, 06:05 PM
Replies: 16
Views: 334
Posted By Duragrouch

I've seen two, both stocked with Park tools on...

I've seen two, both stocked with Park tools on cable leashes. One in front of the REI flagship store, and one in front of the largest regional bike club facilities.

I bike daily with a full...
Forum: Bicycle Mechanics
04-27-24, 05:52 PM
Replies: 9
Views: 266
Posted By Duragrouch

Hmm. Just an unfounded guess, but perhaps due to...

Hmm. Just an unfounded guess, but perhaps due to vertical load, or misalignment at dropouts, the axle is elastically bending (due to vertical and/or clamp loads) enough to impede sliding? Try...
Forum: Folding Bikes
04-27-24, 05:42 PM
Replies: 54
Views: 4,308
Posted By Duragrouch

But wouldn't a British Brompton be a more...

But wouldn't a British Brompton be a more appropriate recovery vehicle for the infamous British car reliability? :)

"Lucas three-position switch; on, off, and flicker."
Forum: Bicycle Mechanics
04-27-24, 05:27 PM
Replies: 18
Views: 351
Posted By Duragrouch

(above) I had forgotten about viscosity...

(above) I had forgotten about viscosity improvers, been too many decades. Yep.

I also save those Talenti jars! Dental acrylic, that's hilarious.

Gosh I would think that a long enough soak in...
Forum: Folding Bikes
04-27-24, 05:17 PM
Replies: 18
Views: 543
Posted By Duragrouch

Well I guess not a surprise as Dahons are known...

Well I guess not a surprise as Dahons are known to vary widely in different international markets. It's especially confusing when they use the same name; There was a thread from someone that had just...
Forum: Folding Bikes
04-27-24, 05:10 PM
Replies: 18
Views: 543
Posted By Duragrouch

Now that's a surprise.

Now that's a surprise.
Forum: Bicycle Mechanics
04-27-24, 04:41 PM
Replies: 33
Views: 1,254
Posted By Duragrouch

I do all of the things you mentioned, standing up...

I do all of the things you mentioned, standing up for drag, not braking continuously. This was on a 220 foot descent over not a long distance and with turns, so a good amount of braking energy. My...
Forum: Bicycle Mechanics
04-27-24, 04:20 PM
Replies: 9
Views: 238
Posted By Duragrouch

The gearing changes noted are not that expensive....

The gearing changes noted are not that expensive. However, it's still money, and best to look before you leap. I did plenty of calculations before my own conversion from 1X to 2X on a folder, and the...
Forum: Folding Bikes
04-27-24, 04:04 PM
Replies: 10
Views: 479
Posted By Duragrouch

Interesting. My instinct would be that if wider...

Interesting. My instinct would be that if wider tires allow lower pressure, that would put less stress on the rims (and I assume you mean the tube pressure between the rim sidewalls pushing the...
Forum: Bicycle Mechanics
04-27-24, 03:55 PM
Replies: 18
Views: 351
Posted By Duragrouch

Sweeks, superb post, thank you. While you had it...

Sweeks, superb post, thank you. While you had it apart, you didn't think there was merit to also putting grease on the gears and roller bearings? Also, after draining entire assembly, no extra gear...
Forum: Bicycle Mechanics
04-27-24, 02:21 AM
Replies: 9
Views: 266
Posted By Duragrouch

I'm not an authority on this hub. I'm very...

I'm not an authority on this hub.

I'm very impressed that you pulled the hub apart, cleaned and regreased it.

The aforementioned clutch to engage gears 6 and 7, what kind of clutch is that? A...
Forum: Bicycle Mechanics
04-27-24, 01:36 AM
Replies: 9
Views: 238
Posted By Duragrouch

As I said on the other duplicate thread: ...

As I said on the other duplicate thread:


Thanks. OK let's unpack this.
Delta 31 teeth in back plus delta 10 teeth in front equals 41 teeth capacity needed for rear derailleur.
M8000-GS says 39...
Forum: Bicycle Mechanics
04-27-24, 12:16 AM
Replies: 33
Views: 1,254
Posted By Duragrouch

Regarding braking on long descents, so a drag...

Regarding braking on long descents, so a drag brake... the problem with bike discs is partly the small amount of heat sink of the disc because they are so thin, though I still like that better than...
Forum: Commuting
04-26-24, 06:38 PM
Replies: 215
Views: 10,039
Posted By Duragrouch

For modern indexed shifting, the indexing steps...

For modern indexed shifting, the indexing steps were all in the shifter, the derailleur was basically the same as friction. (Very early indexing tried steps at the derailleur, it must not have worked...
Forum: Road Cycling
04-26-24, 06:28 PM
Replies: 6
Views: 167
Posted By Duragrouch

Serious long distance backpacker Ray Jardine...

Serious long distance backpacker Ray Jardine would have in prearranged "drift boxes' mailed ahead, spare insoles and shoes, he practiced ultralight backpacking loads and hiked in running shoes. He...
Forum: Bicycle Mechanics
04-26-24, 06:22 PM
Replies: 18
Views: 351
Posted By Duragrouch

Good to know, thanks. I have a folder with a SRAM...

Good to know, thanks. I have a folder with a SRAM 3-speed IGH, bought it from a grad student leaving town (never used it, didn't know the buses here had racks for his mountain bike). Owners manual...
Forum: Bicycle Mechanics
04-26-24, 06:14 PM
Replies: 11
Views: 305
Posted By Duragrouch

Given the perhaps sloppier shifts onto the lowest...

Given the perhaps sloppier shifts onto the lowest (largest) cog, with more lateral chain flex and thus may overshoot, I'd mount a tasteful clear plastic spoke protector (aka dork disc), I think you...
Forum: Folding Bikes
04-26-24, 06:04 PM
Replies: 54
Views: 4,308
Posted By Duragrouch

If compact fold and ease of transport are...

If compact fold and ease of transport are priorities, the Brompton seems still the king, even for travel it folds in 15 seconds, and easily meets checked luggage size limits. The drivetrain folds to...
Forum: Folding Bikes
04-26-24, 05:49 PM
Replies: 54
Views: 4,308
Posted By Duragrouch

I think the way a Brompton locks together (fold,...

I think the way a Brompton locks together (fold, put the seatpost down, that locks the fold together) is one of its better features and very well thought-out.
Forum: Folding Bikes
04-26-24, 05:38 PM
Replies: 18
Views: 543
Posted By Duragrouch

Huh, as I've said, I believe ya. Once I graduated...

Huh, as I've said, I believe ya. Once I graduated from an old recycled 10 speed in 1989 to a decent new race bike, all my 7s have been freehubs and cassettes (usually Shimano 105), but I was also not...
Forum: Folding Bikes
04-26-24, 04:36 AM
Replies: 18
Views: 543
Posted By Duragrouch

IIRC, 5 speed freewheels back in the day were...

IIRC, 5 speed freewheels back in the day were fairly swappable, similar thickness and same threading onto hub, though I could be way wrong about that, I only used a couple and never replaced.

With...
Forum: Touring
04-26-24, 04:11 AM
Replies: 77
Views: 6,493
Posted By Duragrouch

Well I'm just remembering from Bicycle Quarterly...

Well I'm just remembering from Bicycle Quarterly where they said front panniers are more aero than rear panniers (makes sense, more teardrop, smaller zone of wake turbulence), thus their...
Forum: Fitting Your Bike
04-26-24, 02:09 AM
Replies: 13
Views: 374
Posted By Duragrouch

Thanks. OK let's unpack this. Delta 31 teeth in...

Thanks. OK let's unpack this.
Delta 31 teeth in back plus delta 10 teeth in front equals 41 teeth capacity needed for rear derailleur.
M8000-GS says 39 teeth total capacity (a surprise, my measly...
Forum: Folding Bikes
04-25-24, 11:52 PM
Replies: 10
Views: 479
Posted By Duragrouch

Nice looking bike. Can't remember the last time...

Nice looking bike. Can't remember the last time I've seen a large-flange rear hub. Did those hubs come standard? I like the one-piece (non-telescoping) handlebar riser, T-topped (I think, hard to...
Forum: General Cycling Discussion
04-25-24, 11:31 PM
Replies: 27
Views: 881
Posted By Duragrouch

As someone who has repaired fiberglass layups...

As someone who has repaired fiberglass layups with a bare minimum of materials, I would kinda agree. However, some bikes shops will treat a bike with a damaged carbon frame as persona non grata (to...
Forum: Bicycle Mechanics
04-25-24, 11:12 PM
Replies: 19
Views: 375
Posted By Duragrouch

Assuming it was a smooth-slip and not a...

Assuming it was a smooth-slip and not a clunk-slip, I'm gonna guess not chain, chainring, or cog related. Above comments rule most things out. So I'm gonna guess a slight rear tire slip due to...
Forum: Bicycle Mechanics
04-25-24, 10:51 PM
Replies: 11
Views: 305
Posted By Duragrouch

Well the important thing is that it'll do the...

Well the important thing is that it'll do the Kessel Run in only 11 sprockets. If that's not minimum, I dunno what is.
Forum: Fitting Your Bike
04-25-24, 08:39 PM
Replies: 13
Views: 374
Posted By Duragrouch

You need to tell us please: - tire size -...

You need to tell us please:
- tire size
- cassette (cogs) range; Smallest and largest cogs at minimum
- rear derailleur brand and model (often will say on back, like RD-1234).
- front derailleur...
Forum: Advocacy & Safety
04-25-24, 08:06 PM
Replies: 43
Views: 1,047
Posted By Duragrouch

(above) +1. Good approach.

(above) +1. Good approach.
Forum: Touring
04-25-24, 08:02 PM
Replies: 77
Views: 6,493
Posted By Duragrouch

Aerodynamics, absolutely. A less narrow profile...

Aerodynamics, absolutely. A less narrow profile when going through brush off-road, yep. I think both are motivators for bikepacking style. Stability with panniers, not a problem, especially on my 20"...
Forum: Folding Bikes
04-25-24, 07:33 PM
Replies: 18
Views: 543
Posted By Duragrouch

7 speed Liberte is freewheel? I didn't know but...

7 speed Liberte is freewheel? I didn't know but I'll take your word for it, sounds like you own or have investigated the bike. With Dahons, 7 speed and above have been freehubs for, gosh, 20 years...
Forum: General Cycling Discussion
04-25-24, 07:27 PM
Replies: 27
Views: 881
Posted By Duragrouch

Carbon fiber can be real tough under just fatigue...

Carbon fiber can be real tough under just fatigue loading. I would still think that having the layup be thicker at the spoke holes would be most efficient, and that they could add strips or patches...
Forum: Commuting
04-25-24, 02:47 AM
Replies: 3
Views: 290
Posted By Duragrouch

Beat me to it. Amtrak regs says can go in normal...

Beat me to it. Amtrak regs says can go in normal luggage racks in passenger car, no bike fee. I could have stood it up if needed, I'd brought a big black garbage bag in case of that (bifold bike,...
Forum: Bicycle Mechanics
04-25-24, 12:49 AM
Replies: 13
Views: 249
Posted By Duragrouch

Noodle suggestion sounds brilliant.

Noodle suggestion sounds brilliant.
Forum: Folding Bikes
04-25-24, 12:00 AM
Replies: 10
Views: 392
Posted By Duragrouch

There's something incongruous about seeing a...

There's something incongruous about seeing a Brompton on a trainer. Maybe because of differing purposes. But also, I'd worry about putting excess torsional loads into the rear triangle pivot, as the...
Forum: Touring
04-24-24, 11:49 PM
Replies: 77
Views: 6,493
Posted By Duragrouch

Plus it may help bring back level top tubes, more...

Plus it may help bring back level top tubes, more frame bag space.

I do have to admit, for my race bike with no rack braze-ons, I used a seatpost beam rack, but a frame bag would have been nice...
Forum: Bicycle Mechanics
04-24-24, 11:41 PM
Replies: 18
Views: 351
Posted By Duragrouch

I would agree that factory grease is good. But...

I would agree that factory grease is good. But that requires disassembly, and 50 years ago, that involved an incredibly large Proto adjustable wrench (like for bolting together skyscapers), like 2 or...
Forum: Bicycle Mechanics
04-24-24, 11:32 PM
Replies: 20
Views: 633
Posted By Duragrouch

(above) I agree, and that is one of the pluses of...

(above) I agree, and that is one of the pluses of buying through amazon, they tend to enforce that kind of thing. Try the seller first; While some retail sellers would point you to the manufacturer...
Forum: Commuting
04-24-24, 11:20 PM
Replies: 215
Views: 10,039
Posted By Duragrouch

You should go look on the R&M website. Their...

You should go look on the R&M website. Their regular (rigid) cargo bikes come in two different lengths on the cargo area (60 and 75cm), and then there's the suspension bike you see there, which, also...
Forum: Commuting
04-24-24, 09:36 PM
Replies: 215
Views: 10,039
Posted By Duragrouch

Depends if you want to food shop on the way home...

Depends if you want to food shop on the way home from work, that's where racks and panniers are awesome.

Only thing I don't like about that huge basket bike is that the wheels are too close to...
Forum: Bicycle Mechanics
04-24-24, 09:15 PM
Replies: 20
Views: 633
Posted By Duragrouch

Awesome! Glad it was the least serious issue in...

Awesome! Glad it was the least serious issue in terms of parts and labor. Plus it's an improvement, 11T really helps if you are on 20" wheels.
Forum: Bicycle Mechanics
04-24-24, 09:00 PM
Replies: 62
Views: 1,771
Posted By Duragrouch

I like that, I ran the numbers, fewer duplicate...

I like that, I ran the numbers, fewer duplicate gears in the middle, great gear range 500% without big jumps at the cogs. That's good news for me. If I need a higher high from my current 85 gear inch...
Forum: Bicycle Mechanics
04-24-24, 08:39 PM
Replies: 20
Views: 633
Posted By Duragrouch

Oh yes, I know that in normal function, a...

Oh yes, I know that in normal function, a freewheel will, uh, freewheel and not unscrew. If it did, I assumed something was broken in the bearings or ratchet enough to cause enough rotating friction...
Forum: Bicycle Mechanics
04-24-24, 08:32 PM
Replies: 62
Views: 1,771
Posted By Duragrouch

Huh, good to know. I think that was before lift...

Huh, good to know. I think that was before lift pins on the large chainring, right? So how big a jump would upshift OK? I'm thinking that lift pins (or formed protrusions in thin steel rings) help a...
Forum: Bicycle Mechanics
04-24-24, 08:26 PM
Replies: 52
Views: 1,539
Posted By Duragrouch

Even worse, you buy a Shimano chain and a SRAM...

Even worse, you buy a Shimano chain and a SRAM rear derailleur, sounds like you get nothing! My 50/34 hollow spindle 2-piece crank came with zero instructions. Fortunately, I was able to find online,...
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