Search: Posts Made By: Kopsis
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06-16-17, 08:00 PM
Replies: 13
Views: 901
Posted By Kopsis

The lye won't work like penetrating oil. You have...

The lye won't work like penetrating oil. You have to get a large amount in there and dissolve the post all at once from the inside out.

The lye method truly is a last resort solution (no pun...
Forum: Road Cycling
06-09-17, 10:04 AM
Replies: 8
Views: 922
Posted By Kopsis

I remember fighting with this a couple months...

I remember fighting with this a couple months ago. The documented process didn't work for me. What did work were some instructions I found on a Garmin forum:

1. Plug in PowerCap with battery IN....
06-04-17, 04:38 PM
Replies: 8
Views: 9,388
Posted By Kopsis

Cross (racing) and gravel are radically different...

Cross (racing) and gravel are radically different things. You don't need a lot of range to race cross. Fast sections are not that fast, and short enough it's not a big deal to spin a high cadence on...
05-26-17, 11:50 AM
Replies: 199
Views: 10,065
Posted By Kopsis

Hmm ... hadn't considered the effect of...

Hmm ... hadn't considered the effect of compression in the time dimension. I'm not a strong enough rider to see relativistic effects :)

Now, a "seasoned" (i.e. old) engineer would skip the FEA...
05-26-17, 07:25 AM
Replies: 199
Views: 10,065
Posted By Kopsis

One of the first things an engineer learns is how...

One of the first things an engineer learns is how "imprecise" natural language is :) Does "compression" mean a change in dimension due to the application of force (spring compression) or a reduction...
05-24-17, 03:49 AM
Replies: 23
Views: 2,329
Posted By Kopsis

+1 The left bearing is mechanically clamped...

+1

The left bearing is mechanically clamped between the step on the spindle and the left crank arm. Axial play can only come from one of two places: the crank arm isn't being pulled far enough...
05-23-17, 03:47 AM
Replies: 11
Views: 2,109
Posted By Kopsis

Shimano Tiagra, 105, and Ultegra 11 speed hubs...

Shimano Tiagra, 105, and Ultegra 11 speed hubs still use steel freehubs. DA is Titanium, as is White Industries. Industry Nine makes an optional steel freehub body for their MTB hubs, but not the...
Forum: Road Cycling
05-17-17, 04:38 AM
Replies: 14
Views: 2,465
Posted By Kopsis

This is correct and explains why it requires a...

This is correct and explains why it requires a chest strap HR sensor (optical HR sensors have poor, or no, HRV accuracy). In theory, the HRV technique is more accurate than what Strava (and Golden...
05-17-17, 03:49 AM
Replies: 35
Views: 2,498
Posted By Kopsis

Awesome stuff. No adhesive at all. The tape fuses...

Awesome stuff. No adhesive at all. The tape fuses to itself where it overlaps. Takes a little more dexterity to apply, but really nice results.
05-14-17, 04:13 AM
Replies: 8
Views: 1,738
Posted By Kopsis

The spacing between cogs on Shimano and SRAM (and...

The spacing between cogs on Shimano and SRAM (and SunRace) 11-speed cassetes is identical, so indexing can work fine (though you may need adjustments ... keep reading). If you get cassettes with...
Forum: Road Cycling
05-13-17, 03:50 PM
Replies: 29
Views: 4,617
Posted By Kopsis

It's doubtful a true beginner would see any...

It's doubtful a true beginner would see any benefit from a power meter. Power meters are most beneficial when used in conjunction with a structured training plan (continuously fine tuned based on...
Forum: Road Cycling
05-10-17, 07:51 AM
Replies: 34
Views: 3,356
Posted By Kopsis

Attacks (frequent rapid pace changes), sprints,...

Attacks (frequent rapid pace changes), sprints, high speed cornering (especially on descents) ... basically racing-like riding. Those are the kinds of things where a little extra grip and a little...
Forum: Road Cycling
05-10-17, 04:00 AM
Replies: 1,174
Views: 191,373
Posted By Kopsis

http://ebayuk.channeleffect.com/ImageHosting/viewI...

http://ebayuk.channeleffect.com/ImageHosting/viewImage?CompanyId=15875&FilePath=Images/11369

And that's the weld on the frame they thought was good enough to be their show piece :)
Forum: Road Cycling
05-10-17, 03:54 AM
Replies: 1,174
Views: 191,373
Posted By Kopsis

No, it affects reliability and aesthetics. Tubing...

No, it affects reliability and aesthetics. Tubing selection combined with frame geometry affects the ride -- which is typically a complete unknown on an unbranded direct-from-China frame.
Forum: Road Cycling
05-10-17, 03:45 AM
Replies: 34
Views: 3,356
Posted By Kopsis

How aggressively do you ride? Both the GP4K and...

How aggressively do you ride? Both the GP4K and the Schwalbe One are "performance at all costs" tires. They're light and supple but they're some of the least durable tires you can get. If you don't...
05-06-17, 04:07 AM
Replies: 12
Views: 1,313
Posted By Kopsis

https://www.curtlo.com/ -- made to your exact...

https://www.curtlo.com/ -- made to your exact specifications for about a grand.
05-05-17, 04:02 AM
Replies: 5
Views: 749
Posted By Kopsis

Give the Kona seller your best offer and contact...

Give the Kona seller your best offer and contact info and keep looking. As the weeks pass the seller will likely get more motivated to accept. Getting good used bikes on CL at good prices often...
Forum: Road Cycling
05-03-17, 11:33 AM
Replies: 63
Views: 2,295
Posted By Kopsis

Then either you have a defective PM (perhaps road...

Then either you have a defective PM (perhaps road vibration is causing erratic performance of an electronic component) or you're actually not able to put out as much power indoors due to some change...
Forum: Road Cycling
05-03-17, 10:16 AM
Replies: 63
Views: 2,295
Posted By Kopsis

I suspect the PM isn't actually reading lower,...

I suspect the PM isn't actually reading lower, but that what you're seeing is the effect of measurement noise. Unlike the trainer where resistance is smooth and controlled, on the road there is lots...
Forum: Road Cycling
05-01-17, 10:44 AM
Replies: 31
Views: 1,356
Posted By Kopsis

Equating 1983 Shimano 600 with today's 6800 fails...

Equating 1983 Shimano 600 with today's 6800 fails to consider the changes in the Shimano brand over the years. In 1983, Suntour still owned the patent on the slant parallelogram derailleur and was...
05-01-17, 08:37 AM
Replies: 8
Views: 9,388
Posted By Kopsis

I've done some really steep (paved) climbs with a...

I've done some really steep (paved) climbs with a 40/32 low gear but they were mercifully short. It's slightly worse than a compact with an 11-28 (33.4 GI vs. 32.3 GI). For gravel, long climbs,...
Forum: Road Cycling
04-28-17, 08:16 AM
Replies: 23
Views: 881
Posted By Kopsis

More likely than you might think. RF design is...

More likely than you might think. RF design is hard. You have to deal with co channel interference (other transmitters on the same frequency), adjacent channel interference (other transmitters on...
04-25-17, 12:14 PM
Replies: 28
Views: 2,007
Posted By Kopsis

Probably. But if one must make a choice, what's...

Probably. But if one must make a choice, what's the harm in making it an informed one? I'd argue that what, on the surface, seem like small gearing changes are far more noticeable to the recreational...
04-25-17, 07:04 AM
Replies: 28
Views: 2,007
Posted By Kopsis

SRAM offers an 11-26 cassette if you want just a...

SRAM offers an 11-26 cassette if you want just a little more low-end but don't want to go all the way to an 11-28. SRAM and Shimano 11-speed road cassettes are fully interchangeable.

Note that the...
Forum: Road Cycling
04-24-17, 09:01 AM
Replies: 1
Views: 608
Posted By Kopsis

11t-14t? I think there's a typo in there. SRAM...

11t-14t? I think there's a typo in there. SRAM 11-speed cassettes are available in 5 ranges: 11-25, 11-26, 11-28, 11-32, and 11-36. 11-speed road hubs are 130mm OLD spacing, so generally any frame...
04-24-17, 08:36 AM
Replies: 4
Views: 794
Posted By Kopsis

I'm a canti hold-out so no experience with the No...

I'm a canti hold-out so no experience with the No 9. But the Whisky No 7 on my CX bike has been great. Good weight, excellent construction, nice finish, and very stiff (no canti brake judder even...
04-23-17, 04:20 AM
Replies: 35
Views: 1,435
Posted By Kopsis

For road bikes: better rolling resistance vs....

For road bikes: better rolling resistance vs. pressure and self repairing for some % of punctures. Everyone weighs pros/cons differently (a quick search will bring up at least a half dozen recent...
Forum: Road Cycling
04-20-17, 08:18 AM
Replies: 17
Views: 947
Posted By Kopsis

The G-One Speed is the same tire as last year's...

The G-One Speed is the same tire as last year's S-One (so look for S-One reviews for more info). It's basically a wide road tire. Despite the appearance of a tread (and the G series name change),...
Forum: Road Cycling
04-20-17, 06:58 AM
Replies: 58
Views: 3,230
Posted By Kopsis

Florida mostly has Sand Spurs (the Goathead's...

Florida mostly has Sand Spurs (the Goathead's kinder, gentler cousin). Fortunately the Sand Spur's spines are a little thinner and shorter and generally won't penetrate a good kevlar breaker. I've...
04-20-17, 06:38 AM
Replies: 9
Views: 5,070
Posted By Kopsis

Here's a photo of the bearing shield: 560089...

Here's a photo of the bearing shield:

560089

I have no idea if SRAM sells replacements for these or if you have to buy a complete GXP BB. Also note that some Oval cranksets come with BBs made...
04-19-17, 03:07 PM
Replies: 9
Views: 5,070
Posted By Kopsis

The Oval 520 (and 720) borrows (licenses?) the...

The Oval 520 (and 720) borrows (licenses?) the SRAM GXP design. There is a bearing shield that fits over the splined end of the spindle between the BB and the left crank arm.
Forum: Road Cycling
04-19-17, 02:53 PM
Replies: 10
Views: 792
Posted By Kopsis

I have a C17 Carved on my gravel bike. I might...

I have a C17 Carved on my gravel bike. I might have been fine with the C15, but the shop only had a C17 to test and it felt so good I just went with it. Note that my fit on the gravel bike is...
Forum: Road Cycling
04-19-17, 02:53 AM
Replies: 10
Views: 792
Posted By Kopsis

I used to ride a GR2. Since then I've been pretty...

I used to ride a GR2. Since then I've been pretty happy with the Brooks Cambium carved and the Specialized Power. Both are usually available for test rides at the better shops.
Forum: Road Cycling
04-18-17, 12:30 PM
Replies: 20
Views: 635
Posted By Kopsis

Sorry, I keep forgetting that we've entered an...

Sorry, I keep forgetting that we've entered an era where making decisions based on actual facts is passť.
Forum: Road Cycling
04-18-17, 07:35 AM
Replies: 18
Views: 812
Posted By Kopsis

https://k-edge.com/shop/accessories/number-holder/

https://k-edge.com/shop/accessories/number-holder/
Forum: Road Cycling
04-18-17, 07:21 AM
Replies: 20
Views: 635
Posted By Kopsis

My trusty spoke calculator says a 32h Pacenti...

My trusty spoke calculator says a 32h Pacenti SL23 laced 3x to a Shimano 6800 (11-speed) hub will have a L-R tension ratio of 50%. Same rim with an older 6400 10-speed hub will have L-R tension ratio...
04-17-17, 01:25 PM
Replies: 10
Views: 345
Posted By Kopsis

Correct. Any 2x SRAM RD (road or MTB) labeled...

Correct. Any 2x SRAM RD (road or MTB) labeled "Exact-Actuation" will work with 2x11-speed SRAM road shifters & 2x crankset (even if it was originally for only 9 or 10 speed). Any RD labeled...
04-17-17, 01:15 PM
Replies: 10
Views: 345
Posted By Kopsis

All the options I mentioned will work fine with...

All the options I mentioned will work fine with the 2x11 setup you described. Number of speeds is determined by the shifters, not the RD. The RD just has to be able to move the correct distance with...
04-17-17, 01:12 PM
Replies: 10
Views: 345
Posted By Kopsis

The 2x RDs (especially the clutched "type 2"...

The 2x RDs (especially the clutched "type 2" versions) actually work quite well with a 1x setup. There is a slight chance of ghost shifting when things get really bumpy -- that's what the X-Horizon...
Forum: Road Cycling
04-17-17, 01:04 PM
Replies: 66
Views: 2,434
Posted By Kopsis

Whatever it takes to do the rides you want to do....

Whatever it takes to do the rides you want to do. But whether that should be a near term or long term goal is another matter.

Cycling ability varies greatly from rider to rider. One beginner's...
04-17-17, 12:36 PM
Replies: 10
Views: 345
Posted By Kopsis

The "X-Horizon" design (straight parallelogram)...

The "X-Horizon" design (straight parallelogram) used in SRAM's 1x RDs is not designed to work well with a double crankset. Road ("Exact-Actuation") compatible 2x MTB RDs would include X7, X9, X0, and...
Forum: Road Cycling
04-09-17, 12:34 PM
Replies: 19
Views: 4,069
Posted By Kopsis

Yes, technically it is rotating mass, but...

Yes, technically it is rotating mass, but contrary to silly rules like "rotating weight costs double", not all rotating mass on a bike has the same cost. Rotating mass ~170 mm from the axis has a...
04-08-17, 05:37 AM
Replies: 5
Views: 1,896
Posted By Kopsis

As far as I know, the only spider mount 1x...

As far as I know, the only spider mount 1x chainrings with an offset built into the ring are SRAM. However, Wolf Tooth Components has a new system they call "CAMO" that replaces both the chainring...
Forum: Road Cycling
04-07-17, 02:04 PM
Replies: 19
Views: 4,069
Posted By Kopsis

You need the road shoe to use road pedals/cleats....

You need the road shoe to use road pedals/cleats. So the real question is what's the benefit of a road pedal over a MTB pedal. That question has launched many a holy war. My guidance is that if you...
04-06-17, 12:23 PM
Replies: 10
Views: 842
Posted By Kopsis

Spoke tension puts the rim in compression. Too...

Spoke tension puts the rim in compression. Too much compression (how much depends on rim strength) and the rim will deform to release some of it. Imagine if the rim were a straight section of...
Forum: Road Cycling
04-06-17, 07:07 AM
Replies: 180
Views: 12,414
Posted By Kopsis

Also true. My gravel bike, an old steel hybrid...

Also true. My gravel bike, an old steel hybrid converted to drops, tips the scales at 26 lbs and I love it. It feels confident, comfortable, lively, and even a bit whimsical. It's a bike that says...
Forum: Road Cycling
04-05-17, 02:00 PM
Replies: 180
Views: 12,414
Posted By Kopsis

Light bikes feel fast, regardless of the...

Light bikes feel fast, regardless of the measurable performance difference. And cycling is supposed to be a visceral experience -- how the bike feels MATTERS! A very light bike is a magical thing....
Forum: Road Cycling
04-05-17, 12:59 PM
Replies: 43
Views: 1,453
Posted By Kopsis

The algorithm is implemented by the computer, not...

The algorithm is implemented by the computer, not the sensor. There's absolutely no calorie data in the ANT+ HRM profile. The sensor simply provides beat timing that the computer uses to compute rate...
Forum: Road Cycling
04-05-17, 08:29 AM
Replies: 43
Views: 1,453
Posted By Kopsis

kJ as a measurement of training load can be...

kJ as a measurement of training load can be misleading. For example, I hit 400 kJ (as measured by a direct force power meter) in a recent 38 min interval workout. I also hit 300 kJ in a recent 40 min...
04-05-17, 07:16 AM
Replies: 19
Views: 2,054
Posted By Kopsis

My BGs continued to "weep" sealant through the...

My BGs continued to "weep" sealant through the sidewalls for a month before I went back to tubes. In one case, I wasn't losing any pressure, but it appeared that sidewall flex while riding would...
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