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Search: Posts Made By: ofajen
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04-16-21, 06:31 AM
Replies: 95
Views: 2,130
Posted By ofajen

Maybe this will help... ...

Maybe this will help...

https://m.youtube.com/watch?v=QYHxGBH6o4M

Otto
04-15-21, 10:43 PM
Replies: 15
Views: 244
Posted By ofajen

I havenít been in recent years. I still have the...

I havenít been in recent years. I still have the tubular wheel set I built decades ago. I donít really ride roads any more to the extent I can avoid it. However, I could run cyclocross tubulars on...
04-15-21, 07:02 AM
Replies: 12
Views: 300
Posted By ofajen

I think the direct effects of mass would be...

I think the direct effects of mass would be similar.

However, the coefficient of rolling resistance matters more on the rear tire because that tire bears more weight. For a given tire size, all...
04-11-21, 08:46 PM
Replies: 9
Views: 422
Posted By ofajen

Iíve actually had no trouble undoing SRAM and KMC...

Iíve actually had no trouble undoing SRAM and KMC links on 8 speed and SS chains by hand.

OTOH, Iíve had Odyssey Grandstand pedals on both bikes for about four years and kept tearing up the...
04-11-21, 06:47 PM
Replies: 4
Views: 234
Posted By ofajen

Iím still using a first gen Dura-Ace crankset I...

Iím still using a first gen Dura-Ace crankset I bought in the late 70s. No reason to change it, it is rock solid.

My other bike has an SR crankset of similar vintage that is also perfectly solid....
04-11-21, 06:34 PM
Replies: 17
Views: 507
Posted By ofajen

A few observations: We have a diverse set of...

A few observations:

We have a diverse set of city, county, university and state park trails. Some are rail trails while others arenít. The real rail line conversions are very smooth and flat and...
04-10-21, 04:15 PM
Replies: 5
Views: 217
Posted By ofajen

Good to know. Had to look up the uses of Fullerís...

Good to know. Had to look up the uses of Fullerís earth, pugarees, permanganate of potash, French chalk and cotton waste.

Otto
04-09-21, 05:51 PM
Replies: 121
Views: 3,281
Posted By ofajen

Iím not much into using jerseys. In cold weather...

Iím not much into using jerseys. In cold weather I wear a windbreaker that has a handy front pocket for the cell phone.

I didnít want to have to wear a bulky ďfanny packĒ to hold the phone now...
04-08-21, 04:09 PM
Replies: 90
Views: 3,698
Posted By ofajen

If you have 60 minutes to spare (sorry, I...

If you have 60 minutes to spare (sorry, I initially thought it was shorter) this podcast has an excellent discussion on the topic that features Jan Heine and Josh Poertner who developed wheels and...
04-08-21, 07:52 AM
Replies: 10
Views: 326
Posted By ofajen

I expect to run a chain at least 3000 miles and...

I expect to run a chain at least 3000 miles and hopefully 4000 miles before replacing it. Replacement spec for SS is 1% lengthening, so 1/10Ē over 10 links.

I have at least 1500 single speed miles...
04-07-21, 07:10 PM
Replies: 26
Views: 848
Posted By ofajen

Nice idea! An upgrade from using my water...

Nice idea! An upgrade from using my water bottle. Fewer trips to the sink to refill if itís really messy. Mine have been used for Roundup so probably better to get a new one.

Otto
04-05-21, 08:39 PM
Replies: 116
Views: 2,309
Posted By ofajen

Mine might as well be the color of trail dust. ...

Mine might as well be the color of trail dust.

On second thought, that would be harder to see where to clean.

I like the metallic blue on my old Schwinn but maybe with not quite so much rust...
04-05-21, 05:00 PM
Replies: 26
Views: 848
Posted By ofajen

In the winter, I rinse off the mud and crud from...

In the winter, I rinse off the mud and crud from the bottom bracket area with water sprayed from my water bottle. Now that itís not so muddy, I usually just clean the dust and splatter with a brush...
04-04-21, 08:27 PM
Replies: 106
Views: 3,569
Posted By ofajen

My experience is that if you force yourself to...

My experience is that if you force yourself to work harder in the tough parts (climbs and headwinds) you will soon be able to ride somewhat faster and recover quicker from those harder bits.

Otto
04-04-21, 08:20 PM
Replies: 2,462
Views: 164,412
Posted By ofajen

24 miles on a beautiful, windy day and a new...

24 miles on a beautiful, windy day and a new tweak on an old route. Recent work by the city to add some important bike lanes made a new route safe and let me connect an extra stretch of new trail...
04-01-21, 09:16 AM
Replies: 49
Views: 1,548
Posted By ofajen

Ah yes, thatís true for the rolling resistance...

Ah yes, thatís true for the rolling resistance term. However, 3% of, say, 30W would only be 1W, so it is a smaller effect on your workload than 3% of the climbing term, which for me would often be...
03-31-21, 08:22 PM
Replies: 49
Views: 1,548
Posted By ofajen

Just noting that while the gravity term will...

Just noting that while the gravity term will dominate, there will be rolling friction and air friction terms when climbing. If I climb a 5% grade at 12 mph, the gravity term will be about 250-260W...
03-27-21, 05:37 PM
Replies: 61
Views: 2,107
Posted By ofajen

I think itís become more of a common measurement...

I think itís become more of a common measurement for people to see with vehicles that now have onboard sensors that measure slope in degrees. Iíve only seen % grade shown on road signs.

Otto
03-27-21, 05:27 PM
Replies: 53
Views: 1,390
Posted By ofajen

I wear bifocals all the time. When biking, I use...

I wear bifocals all the time. When biking, I use cheap clip-on shades. Works great.

Otto
03-26-21, 10:22 PM
Replies: 24
Views: 867
Posted By ofajen

I carry a 6mm hex wrench for other reasons but...

I carry a 6mm hex wrench for other reasons but that would work on my pedals. Canít recall that happening though.

Carrying a stubby 15mm wrench would be a friendly gesture, in case someone with...
03-26-21, 12:51 PM
Replies: 29
Views: 897
Posted By ofajen

Ok, but donít you dare wear headphones when you...

Ok, but donít you dare wear headphones when you ride it!

Otto
03-26-21, 12:48 PM
Replies: 52
Views: 1,978
Posted By ofajen

Thatís crazy talk! Never gonna happen. I was...

Thatís crazy talk! Never gonna happen. I was thinking of going back to solid rubber tires. 😊

Otto
03-26-21, 12:37 PM
Replies: 61
Views: 2,107
Posted By ofajen

Partly you are still wanting to collapse the...

Partly you are still wanting to collapse the different quantities of angle and slope.

Underlying that, however, is the sensible question of why a right angle is 90 degrees. There is a unit called...
03-26-21, 12:05 PM
Replies: 61
Views: 2,107
Posted By ofajen

As a comparison example, two regular parts of my...

As a comparison example, two regular parts of my rides these days are climbing several 5% hills at about 12 mph and riding 15 mph on level ground into the usual 12 mph headwind this time of year. ...
03-26-21, 07:43 AM
Replies: 61
Views: 2,107
Posted By ofajen

I just figure 1.75% of grade for each 1 degree. ...

I just figure 1.75% of grade for each 1 degree.

The exact number is a tiny bit less (1.7455%), but itís a good approximation for any hill I would ever tackle. For truly steep angles, the grade...
03-25-21, 08:26 PM
Replies: 16
Views: 396
Posted By ofajen

Iíd agree with that. Other than a three week...

Iíd agree with that. Other than a three week Arctic invasion in February, I was able to regularly ride outside all this winter. The wind always seems to be at least 10 mph or more with the leaves...
03-22-21, 07:59 AM
Replies: 126
Views: 3,777
Posted By ofajen

You are correct: Ē12-812. Use of Audio...

You are correct:

Ē12-812. Use of Audio Headphones. 50 (https://codelibrary.amlegal.com/?o=1#foot-12-1)
(1) No person shall operate a bicycle on a street or highway while wearing headphones...
03-22-21, 07:00 AM
Replies: 126
Views: 3,777
Posted By ofajen

Can you give an example of somewhere that imposes...

Can you give an example of somewhere that imposes such a fine? It seems curious. Deaf people can operate motor vehicles and ride bikes. If a region tried to impose that, a deaf person with an impish...
03-22-21, 06:54 AM
Replies: 6
Views: 254
Posted By ofajen

Probably a (roughly) 300 gram training tire like...

Probably a (roughly) 300 gram training tire like a Continental Giro or Vittoria Rally would be a good start. Iíd pick the 23s if thatís an option.

Otto
03-21-21, 03:35 PM
Replies: 57
Views: 1,242
Posted By ofajen

I donít have a complete spare, but both my bikes...

I donít have a complete spare, but both my bikes have the same cockpit, saddle and pedals, which I mostly like. They are somewhat different bikes, as one is a vintage road frame while the other is a...
03-21-21, 03:26 PM
Replies: 51
Views: 1,324
Posted By ofajen

I would always be considering the specific size...

I would always be considering the specific size of wheel and tire that the frame was designed for, particularly as it relates to the total distance from the front axle to the ground. The head tube...
03-20-21, 01:50 PM
Replies: 13
Views: 431
Posted By ofajen

My first thought is that Iím grateful I got my...

My first thought is that Iím grateful I got my first bike before six years of age and have had at least one bike ever since. Glad you will have a great bike! Agree with the advice about a fit. Good...
03-20-21, 01:42 PM
Replies: 37
Views: 878
Posted By ofajen

I find that riding single speed really helps with...

I find that riding single speed really helps with the suffering part. 😊

Hills and headwinds become a sort of existential challenge that force you to repeatedly work at higher output levels. The...
03-18-21, 09:55 PM
Replies: 37
Views: 878
Posted By ofajen

Agreed, itís a good rough number for whatever we...

Agreed, itís a good rough number for whatever we consider a rider of ďaverageĒ weight. But a larger rider of equivalent fitness will have a lower figure, because of the scaling of VO2 max and thus...
03-18-21, 08:27 PM
Replies: 37
Views: 878
Posted By ofajen

Other things being equal, as in all highly...

Other things being equal, as in all highly trained athletes being compared, power requirements for cycling scale more closely with mass than max watts/kg.

So achieving 4 watts/kg indicates greater...
03-18-21, 12:35 PM
Replies: 8
Views: 333
Posted By ofajen

I use that model of brush or a paper towel...

I use that model of brush or a paper towel (depending on my mood) to wipe stuff off my chain after most every ride. All my rides are on dusty or muddy trails and paths.

Every few rides, when...
03-16-21, 07:53 PM
Replies: 2,462
Views: 164,412
Posted By ofajen

17 yesterday and 23 today. Both days cold, damp,...

17 yesterday and 23 today. Both days cold, damp, cloudy and windy. Had to sneak all the rides this last week in between episodes of rain. Glad to have the new clip on fenders on the old Schwinn!
...
03-16-21, 12:02 PM
Replies: 27
Views: 679
Posted By ofajen

Yeah, I read that article a while ago. Iím...

Yeah, I read that article a while ago. Iím talking about measurements. Jan is into measurement vs. speculation, as am I.

Otto
03-16-21, 10:01 AM
Replies: 27
Views: 679
Posted By ofajen

There are comparisons of same tire and rim...

There are comparisons of same tire and rim running tubeless versus, latex, thin butyl and standard butyl tubes. IIRC, tubeless is best, with latex usually adding a bit over 1W, thin butyl maybe 3W...
03-16-21, 09:51 AM
Replies: 67
Views: 2,191
Posted By ofajen

You can always replace wheels. Or, if you can...

You can always replace wheels. Or, if you can find rims with the same ERD, you can replace them forty years from now with a simple rim transfer and not even have to re-lace the wheel. Though rim...
03-16-21, 09:46 AM
Replies: 51
Views: 1,324
Posted By ofajen

Yeah, the geometry is just not very cooperative....

Yeah, the geometry is just not very cooperative. I rode a late 80s RockHopper with drop bars for several years, but last year I switched it to swept back touring bars, and I regard that as pretty...
03-15-21, 12:50 PM
Replies: 13
Views: 917
Posted By ofajen

If you can get a 41 or 43 chainring (both of...

If you can get a 41 or 43 chainring (both of which are prime numbers) the number of skid patches will equal the number of teeth on the rear cog. 43/16 would be very similar to 48/18.

Otto
03-14-21, 09:24 AM
Replies: 98
Views: 3,767
Posted By ofajen

Among the things you mentioned, this one is super...

Among the things you mentioned, this one is super easy to adapt: there are plenty of quill stem adapters that allow using modern stems and bars on bikes designed for quill stems.

Both of my 80s...
03-13-21, 11:07 PM
Replies: 2,462
Views: 164,412
Posted By ofajen

Hmmm. I did a tad under 32 miles today in 50F,...

Hmmm. I did a tad under 32 miles today in 50F, cloudy, damp and strong headwinds all the way back home after I did a hard pace to get to midway. Fairly brutal in the wind on a single speed. Still...
03-11-21, 08:03 AM
Replies: 98
Views: 3,767
Posted By ofajen

Just for fun, I used my weight of 175 lbs as an...

Just for fun, I used my weight of 175 lbs as an example and tried to estimate the difference 9 lbs of bike weight would make in a couple of my typical riding situations.

omnicalculator.com says...
03-09-21, 03:52 PM
Replies: 93
Views: 2,383
Posted By ofajen

I guess it depends on how many watts I want to...

I guess it depends on how many watts I want to dissipate. If Iím really working, 60F seems optimal. If Iím working less, Iíd rather have it closer to 70F.

Otto
03-06-21, 06:35 PM
Replies: 24
Views: 1,264
Posted By ofajen

How about you use your 38t chaining with the 19...

How about you use your 38t chaining with the 19 for about 55 gear inches? If you remove one chain link, you should be pretty close to the same spot on the dropout as you are with 42/19. Or run...
03-01-21, 10:49 AM
Replies: 2,462
Views: 164,412
Posted By ofajen

After our Arctic debacle, I was delighted to ride...

After our Arctic debacle, I was delighted to ride outside the last three days. A faster 20 miles yesterday than the similar ride on Friday, as a lot of areas were not as soft and sticky after more...
03-01-21, 10:35 AM
Replies: 89
Views: 3,810
Posted By ofajen

I canít speak too specifically to German bike...

I canít speak too specifically to German bike makers, but generally in terms of international trade, a lot of German companies try to make products in Germany and position themselves as providing...
02-28-21, 09:49 PM
Replies: 224
Views: 6,956
Posted By ofajen

I ride solo almost all the time. All the usual...

I ride solo almost all the time. All the usual things: ride from home, donít have to wait on someone, no wheel contact, quiet meditation, riding when and where I want, etc.

Plus I want to do the...
Showing results 1 to 50 of 661
 


 
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