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Search: Posts Made By: gsa103
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Forum: Road Cycling
03-23-21, 06:03 PM
Replies: 27
Views: 1,521
Posted By gsa103

Road shoes/cleats are optimized for professionals...

Road shoes/cleats are optimized for professionals who are riding 200+ km stages and capable of putting out >1200W sprints. They walk from the bus, to the bike parked next to the bus, and that's it. ...
Forum: Road Cycling
03-23-21, 05:54 PM
Replies: 22
Views: 556
Posted By gsa103

I was about to ask that. What are you using for...

I was about to ask that. What are you using for rim tape? The rim tape should go across the full width, not just over the inner channel. Slightly thicker or double-wrapping may help.

And once...
Forum: Road Cycling
03-23-21, 05:45 PM
Replies: 31
Views: 2,083
Posted By gsa103

You forgot poor biomechanics. That's trainable,...

You forgot poor biomechanics. That's trainable, but people rarely train cycling technique (other than some mountain bike skills). And triathletes are a different case, it makes sense for them to...
03-23-21, 02:54 PM
Replies: 12
Views: 432
Posted By gsa103

Assuming you're not running the derailleur at or...

Assuming you're not running the derailleur at or above capacity. It can get even trickier with full-suspension bike operating at capacity. Big-big is safer, but small-small works better for...
03-23-21, 10:46 AM
Replies: 7
Views: 331
Posted By gsa103

I don't have a gear sensor, I just use the front...

I don't have a gear sensor, I just use the front brake lever as a clutch while shifting. Even with hydraulic disc brakes you should be able to get the sensor to disconnect without introducing any...
03-22-21, 06:19 PM
Replies: 11
Views: 293
Posted By gsa103

There's two basic strategies for Shimano,...

There's two basic strategies for Shimano, top-down or bottom-up. The Park video is the bottom-up strategy. The official Shimano procedure is a top-down, which doesn't require the syringe, just...
03-22-21, 02:52 PM
Replies: 5
Views: 191
Posted By gsa103

It's pretty simple. If the tire has the same...

It's pretty simple. If the tire has the same volume as the air chamber, the new pressure will be half 1/(1+1). If the tire is 2x the volume of the chamber it will be 1/3 the pressure after 1/(1+2)....
03-22-21, 01:24 PM
Replies: 5
Views: 191
Posted By gsa103

For a fat bike, you can probably just load it up...

For a fat bike, you can probably just load it up to whatever is comfortable pumping it up to. The pressure will go down when it expands to the volume of the tire. I'd go to at least to about 120psi...
03-19-21, 06:38 PM
Replies: 23
Views: 1,394
Posted By gsa103

Rule #25: The bikes on top of your car should be...

Rule #25: The bikes on top of your car should be worth more than the car.
03-19-21, 12:22 PM
Replies: 28
Views: 937
Posted By gsa103

That bike is very difficult to lock-up. Your...

That bike is very difficult to lock-up. Your best bet is to carry a hefty chain and lock it to a solid object. Chain through the rear wheel is probable the only option.
A lot of theft depends on...
03-18-21, 10:12 AM
Replies: 18
Views: 770
Posted By gsa103

$120, yike. You could probably cobble...

$120, yike.
You could probably cobble something together with a rectifier, some caps and a buck converter.
A 7805 is very good a providing at reliable supply, but they're not at all efficient. ...
03-18-21, 10:03 AM
Replies: 18
Views: 570
Posted By gsa103

For home use, a 5Nm fixed value torque driver...

For home use, a 5Nm fixed value torque driver covers probably 95% of the small fasteners. Look at the stems and other things on your bike and see what the torque value is for them. If you need less...
03-15-21, 04:38 PM
Replies: 31
Views: 1,209
Posted By gsa103

A battery and motor generally add about 20lbs to...

A battery and motor generally add about 20lbs to a bike, so that quickly puts bikes into the 40-50lbs territory, because they're based on 30lbs bikes. The Specialized Turbo Vado SL is ~33lbs, but...
03-15-21, 04:24 PM
Replies: 26
Views: 694
Posted By gsa103

Don't tighten the top cap down so much. Just get...

Don't tighten the top cap down so much. Just get it snug. The air pressure in the tire keeps it closed, the screw is redundancy. If you really tighten the top cap down, you're more likely to...
Forum: Road Cycling
03-10-21, 05:38 PM
Replies: 112
Views: 3,349
Posted By gsa103

The reason the TT specialists go big has nothing...

The reason the TT specialists go big has nothing to do with the front gear efficiency. They go big because of the REAR gear efficiency. Small gears below about a 15T are less efficient, especially...
Forum: Road Cycling
03-05-21, 12:44 PM
Replies: 24
Views: 997
Posted By gsa103

Modern tubeless rims don't let go of tires, ask...

Modern tubeless rims don't let go of tires, ask anyone who's tried to change a tire on a newer rim lately. Especially for the one-day races, tubeless vs latex makes very little difference. With a...
03-05-21, 11:38 AM
Replies: 39
Views: 1,139
Posted By gsa103

If the batteries are imbalanced, when you connect...

If the batteries are imbalanced, when you connect them in parallel they will re-balance INSTANTLY, and draw VERY high current during the process. A 2V imbalance in the battery packs can result in...
03-03-21, 11:54 AM
Replies: 47
Views: 9,849
Posted By gsa103

Most of the time it'll fry the voltage regulator,...

Most of the time it'll fry the voltage regulator, and hard to say what else after that. The voltage regulator is probably U5, but I can't read the label on it to confirm. I'd say it's 50/50 as to...
03-02-21, 07:02 PM
Replies: 7
Views: 612
Posted By gsa103

Only if you have spare batteries, which most...

Only if you have spare batteries, which most people probably don't carry. At this point Li-ion batteries are cheap and so dramatically better, that I can't recommend anyone get a AA powered light. ...
03-02-21, 06:40 PM
Replies: 13
Views: 875
Posted By gsa103

By default, the Garmin will use GPS data to...

By default, the Garmin will use GPS data to calibrate the speed sensor. The speed sensor is the primary source, but something like a 500m segment the GPS can get a really accurate measurement of the...
03-02-21, 03:42 PM
Replies: 32
Views: 777
Posted By gsa103

3d Printers are simultaneously very fast and...

3d Printers are simultaneously very fast and really slow. My average print is probably about 8hrs. In a little over a year, my printer has 80 days of print time. Most of the time it's a about...
03-01-21, 06:21 PM
Replies: 76
Views: 2,959
Posted By gsa103

Run wider mountain bike tires. Running standard...

Run wider mountain bike tires. Running standard trail pressure on flat ground, I tend to top out at at 35kph. If you're hitting 50 kph, it's because you're going downhill, and you'd probably hit 45...
03-01-21, 05:56 PM
Replies: 48
Views: 2,291
Posted By gsa103

Fat tires can run lower pressure and the air...

Fat tires can run lower pressure and the air cushion provides suspension. The main disadvantage of fatter tires is rolling resistance, which doesn't matter with an eBike.
The extra suspension is...
03-01-21, 01:21 PM
Replies: 32
Views: 777
Posted By gsa103

But, but....I have a hammer (3d printer),...

But, but....I have a hammer (3d printer), everything must be a nail!
+1 for BBG, I bought a nice anodized one for my Yeti.
And yes, I'm also a 3d printer addict (FDM & SLA). Definitely...
03-01-21, 01:11 PM
Replies: 14
Views: 574
Posted By gsa103

Step 1: Sell your existing wheels. Step 2: ...

Step 1: Sell your existing wheels.
Step 2: Buy the wheels you actually want.
Doing the conversion will involve new hubs, new spokes, and re-lacing the wheel. You might as well just buy new...
03-01-21, 01:08 PM
Replies: 15
Views: 706
Posted By gsa103

Battery bars typically measure voltage and can be...

Battery bars typically measure voltage and can be accurate or inaccurate, depending on the correction applied. Li-ion battery drain is quite non-linear, the voltage drops very quickly at the start...
02-26-21, 08:58 PM
Replies: 26
Views: 1,002
Posted By gsa103

Hub drives tend to struggle more with hills,...

Hub drives tend to struggle more with hills, because they can't use the bicycles gearing. Looking at the Grin motor simulator, a 500W Bafang will overheat very quickly >10% grades. A BBS02 and...
02-25-21, 03:17 PM
Replies: 26
Views: 1,002
Posted By gsa103

Deore is a tier of Shimano components, designed...

Deore is a tier of Shimano components, designed for mountain bikes. Currently, Deore is available in 10, 11 or 12 speed. It will take cassettes up to 51t, and the Deore rear derailleur is designed...
02-25-21, 12:15 PM
Replies: 14
Views: 899
Posted By gsa103

Bafang is fine. The integration here is garbage....

Bafang is fine. The integration here is garbage. If you look closely at a Bafang motor mount, there's an extra screw hole, so you can bolt the motor to the frame. Jones didn't even bother to...
02-25-21, 12:01 PM
Replies: 34
Views: 1,844
Posted By gsa103

My bike is a Giant Toughroad (rigid 29er...

My bike is a Giant Toughroad (rigid 29er touring), so probably lighter, but not all that different. My battery draw is based on perfectly flat, no wind, good pavement, and I'm probably adding ~150W....
02-25-21, 11:40 AM
Replies: 26
Views: 1,002
Posted By gsa103

When you say very hilly, what do you mean (what %...

When you say very hilly, what do you mean (what % grades)? 42:32 is pretty normal by ebike standards, for urban riding. For example, a Specialized Turbo Vado is 40:36, so lower, but it only has a...
02-24-21, 07:43 PM
Replies: 8
Views: 742
Posted By gsa103

On a bike like a Sirrus, I'd go for a 48t, unless...

On a bike like a Sirrus, I'd go for a 48t, unless you have lots of really hellacious hills (>8%). A 48/28 combination is doing 8mph at 60rpm. Most people riding an ebike are going to want to go...
02-24-21, 07:30 PM
Replies: 34
Views: 1,844
Posted By gsa103

Cadence is irrelevant on the BBS motors. The...

Cadence is irrelevant on the BBS motors. The motor will continue to put out power at 120rpm and higher. The PAS will continue to supply power even if you're only pedalling at 60 rpm and the motor...
Forum: Road Cycling
02-24-21, 06:22 PM
Replies: 22
Views: 940
Posted By gsa103

Cheap, reliable, light. Pick 2. Buy the DA...

Cheap, reliable, light. Pick 2. Buy the DA cassette if you want reliable shifting. Bodge something together if you don't want to spend the money. The reason you can't get perfect shifting is that...
02-24-21, 05:40 PM
Replies: 18
Views: 1,058
Posted By gsa103

At least a couple of the local bike shops in your...

At least a couple of the local bike shops in your area should be able to do basic fork/shock service. Look for any bike shop that caters to mountain bikes.
Shock service on a basic air shock is...
02-23-21, 12:06 PM
Replies: 7
Views: 355
Posted By gsa103

The bearings are probably frozen in place anyway,...

The bearings are probably frozen in place anyway, and the suspension was probably garbage even new. All things considered it's probably better now.
02-18-21, 07:55 PM
Replies: 27
Views: 1,548
Posted By gsa103

29er on 2.25tires at 140lbs, I think the correct...

29er on 2.25tires at 140lbs, I think the correct pressure is somewhere around 20psi, probably a hair under. For reference, I ride 26x2.35 at 160lbs, and I run 18/22 tubeless. You're lighter with...
02-16-21, 01:05 PM
Replies: 29
Views: 993
Posted By gsa103

Geared DC motors are very common. The fact is...

Geared DC motors are very common. The fact is that electric motors like high RPM, in all configurations. Most applications use a integrated gear box, even Tesla uses an 8:1 reduction. A 250W hub...
02-12-21, 03:33 PM
Replies: 18
Views: 1,161
Posted By gsa103

Torque sensing provides much better feel because...

Torque sensing provides much better feel because it's amplifying your natural effort level. That's typically only found in mid-drives, and mostly in pre-built bikes. A mid-drive can integrate the...
02-12-21, 03:19 PM
Replies: 20
Views: 545
Posted By gsa103

I tried them as well because I ride with goat...

I tried them as well because I ride with goat heads. They will self-seal enough to get you home, but not more than that. The flex between the tire & tube means that the sealant can't properly seal,...
02-11-21, 03:48 PM
Replies: 68
Views: 3,115
Posted By gsa103

The simple answer is a steel insert sleeve for...

The simple answer is a steel insert sleeve for CF. Every other application is the outer bearing race is pressed into a steel insert. But that's too heavy, it would add at least 100g likely more,...
02-09-21, 07:59 PM
Replies: 40
Views: 1,233
Posted By gsa103

Alternatively, genuine Shimano is about $10 for...

Alternatively, genuine Shimano is about $10 for 4oz, which is probably enough to last me 5 years. If you're not a shop or racer, the cost/oz is irrelevant because you're buying stupid large...
02-09-21, 05:39 PM
Replies: 30
Views: 1,018
Posted By gsa103

That's the worst part about forks. You need a...

That's the worst part about forks. You need a ton of specific tools. And I should send my fork off to get it rebuilt, because mountain bikes are high maintenance.
02-08-21, 05:02 PM
Replies: 20
Views: 1,198
Posted By gsa103

I haven't seen a crash, but it would be bad. I'm...

I haven't seen a crash, but it would be bad. I'm predicting a sudden interest in dropper seatposts. Same benefit but legal.
01-29-21, 05:00 PM
Replies: 8
Views: 285
Posted By gsa103

It'd be a miracle if a 40yr seat tube is anything...

It'd be a miracle if a 40yr seat tube is anything resembling round to 0.2mm. That difference is miniscule. Use a 26.6 or 26.8 whichever is more readily available. There will be zero difference in...
01-28-21, 07:45 PM
Replies: 54
Views: 2,367
Posted By gsa103

Poster responds by posting picture of a Dutch...

Poster responds by posting picture of a Dutch commuter bike.....Although, honestly a proper Dutch bike has a slacker fork and would probably handle better.

For anyone wondering. Single track...
01-28-21, 07:30 PM
Replies: 6
Views: 558
Posted By gsa103

I thought it was a really good idea by the...

I thought it was a really good idea by the organizers, for a stage where most riders would be swapping. The teams had an incentive to use the bike swap area, since they didn't need to remove the...
Forum: Road Cycling
01-28-21, 06:50 PM
Replies: 14
Views: 897
Posted By gsa103

For the TdF, neutral support isn't really an...

For the TdF, neutral support isn't really an issue with the cars. Froome's jogging was probably the last time someone took a bike from neutral service, and that was such a freak accident it'll...
01-28-21, 12:58 PM
Replies: 32
Views: 1,386
Posted By gsa103

184W (2.6 W/kg) is a perfectly reasonable effort...

184W (2.6 W/kg) is a perfectly reasonable effort for a fit life-long cyclist, especially for something like a 10-20 min effort up a known climb. That may be an above threshold value, but if they can...
01-20-21, 03:55 PM
Replies: 32
Views: 1,659
Posted By gsa103

Bondhus makes quality reliable ball drivers. ...

Bondhus makes quality reliable ball drivers. Wera is very nice, but if you want a ball driver, Bondhus work very well.
Source: I work in optics, 3/8in ball drivers are the equivalent of 10mm...
Showing results 1 to 50 of 1000
 


 
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