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Search: Posts Made By: oldbobcat
Showing results 1 to 50 of 1000
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Forum: Bicycle Mechanics
04-24-24, 06:50 PM
Replies: 28
Views: 379
Posted By oldbobcat

First, it looks like your rear wheel is...

First, it looks like your rear wheel is improperly dished. But you didn't ask about that, so I'll set that aside for now.

Second, your entire brake adjustment is wonky. If I were working on your...
Forum: Fitting Your Bike
04-22-24, 03:06 PM
Replies: 5
Views: 237
Posted By oldbobcat

This forum is about bike fit. Gear ratios are not...

This forum is about bike fit. Gear ratios are not about bike fit. You might get better responses if you post this in mechanics or mountain biking
Forum: Bicycle Mechanics
04-22-24, 01:17 PM
Replies: 58
Views: 1,302
Posted By oldbobcat

39 is as low as you can reliably go on a 130 mm...

39 is as low as you can reliably go on a 130 mm BCD. I've seen 38s, but for the single-tooth gain they aren't worth the bother. At the first hint of wear on the teeth and chain, the chain starts to...
Forum: Bicycle Mechanics
04-20-24, 02:49 PM
Replies: 58
Views: 1,302
Posted By oldbobcat

Your current low gear ration is 1.7:1. Most...

Your current low gear ration is 1.7:1. Most likely, your rear derailleur will handle a 13/28 cassette with no problem. That gives you a low of 1.4:1. I don't know what the hills in your neighborhood...
Forum: Bicycle Mechanics
04-17-24, 01:34 PM
Replies: 7
Views: 455
Posted By oldbobcat

I love a mystery.

I love a mystery.
Forum: Bicycle Mechanics
04-16-24, 11:20 AM
Replies: 32
Views: 937
Posted By oldbobcat

I used Universal 68s for 7-8 years, until I...

I used Universal 68s for 7-8 years, until I finally sprung for a full Super Record kit. Following the move away from centerpulls in the early '60s, nearly everyone used these until Campaganolo made a...
Forum: Bicycle Mechanics
04-16-24, 09:50 AM
Replies: 10
Views: 460
Posted By oldbobcat

Great idea. This sort of thing is pretty routine...

Great idea. This sort of thing is pretty routine for most shops.
Forum: Bicycle Mechanics
04-16-24, 09:45 AM
Replies: 7
Views: 455
Posted By oldbobcat

If you're switching to a double-ring crank, you...

If you're switching to a double-ring crank, you should use a shorter spindle, 108-110 mm. If this is a triple, 115 mm will be fine, as long as the inner chainring doesn't hit the chainstay.
Forum: Bicycle Mechanics
04-16-24, 09:36 AM
Replies: 30
Views: 1,166
Posted By oldbobcat

You said it right there. Anything on a 10-speed...

You said it right there. Anything on a 10-speed chain or thinner after 3000 miles is on borrowed time.
Forum: Bicycle Mechanics
04-14-24, 10:32 AM
Replies: 21
Views: 751
Posted By oldbobcat

I can try to guess what your problem is and give...

I can try to guess what your problem is and give you advice that might address the problem. Or I can show you where you can learn to really fix it yourself....
Forum: Classic & Vintage
04-10-24, 08:37 AM
Replies: 69
Views: 1,960
Posted By oldbobcat

We just learn to not pedal through corners. Of...

We just learn to not pedal through corners. Of course, with the current trend toward shorter cranks, 175 mm is becoming odder and rarer.

Pros who used 175s seem to have their own reasons. Jacques...
Forum: Fifty Plus (50+)
04-08-24, 09:39 AM
Replies: 79
Views: 2,298
Posted By oldbobcat

I look at cadence like IQ points. More rpm won't...

I look at cadence like IQ points. More rpm won't automatically make you faster, but it's a good thing to have and you can get more of it through exercise.
Forum: Bicycle Mechanics
04-08-24, 09:35 AM
Replies: 14
Views: 501
Posted By oldbobcat

Personally, I can live without 52/11 and the...

Personally, I can live without 52/11 and the crawling difference between 34 and 36 is so small that I prefer 50/36. I use the 36 more than I used the 34, and the drop from the 50 feels more like...
Forum: Bicycle Mechanics
04-08-24, 09:28 AM
Replies: 30
Views: 1,093
Posted By oldbobcat

A pile of parts that no one wants.

A pile of parts that no one wants.
Forum: Bicycle Mechanics
04-05-24, 06:21 PM
Replies: 21
Views: 697
Posted By oldbobcat

That will screw up your chain line. Better...

That will screw up your chain line.

Better to extend at the other end of the crank. Your local bike shop probably does not stock pedal spindle extenders, but they can order them for you from J&B....
Forum: Bicycle Mechanics
04-03-24, 04:25 PM
Replies: 14
Views: 419
Posted By oldbobcat

So have I.

So have I.
Forum: Bicycle Mechanics
04-01-24, 01:33 PM
Replies: 14
Views: 419
Posted By oldbobcat

Are you sure you threaded the chain on the...

Are you sure you threaded the chain on the correct side of the retention tab on the pivot arm of the rear derailleur?
Forum: Bicycle Mechanics
04-01-24, 01:14 PM
Replies: 13
Views: 581
Posted By oldbobcat

Have a pro mechanic look at it.

Have a pro mechanic look at it.
Forum: Bicycle Mechanics
04-01-24, 09:47 AM
Replies: 28
Views: 1,169
Posted By oldbobcat

Well, the stated problem was retraction and, in...

Well, the stated problem was retraction and, in my experience, the leading cause of failure to retract was busted plastic housings.
Forum: Bicycle Mechanics
03-31-24, 04:02 PM
Replies: 9
Views: 523
Posted By oldbobcat

Shimano fixed this when Sora went 9-speed. And...

Shimano fixed this when Sora went 9-speed. And 4600 is 10-speed, so there's a chain width discrepancy.
Forum: Fitting Your Bike
03-31-24, 02:18 PM
Replies: 1
Views: 175
Posted By oldbobcat

With this line, Medium is all you need to know.

With this line, Medium is all you need to know.
Forum: Bicycle Mechanics
03-31-24, 01:49 PM
Replies: 27
Views: 762
Posted By oldbobcat

We can imagine all sorts of possible and...

We can imagine all sorts of possible and impossible scenarios, but the only way to know for sure is to put the bike on a repair stand and watch the chain very closely as it's put through its shifts...
Forum: Bicycle Mechanics
03-30-24, 12:14 PM
Replies: 28
Views: 1,169
Posted By oldbobcat

Look for brand-name brakes (Avid, Shimano,...

Look for brand-name brakes (Avid, Shimano, Tektro, Origin 8, etc.) that don't have plastic return spring housings that eventually get brittle and break. Ask a shop mechanic to show you, if you don't...
Forum: Bicycle Mechanics
03-29-24, 06:44 PM
Replies: 6
Views: 329
Posted By oldbobcat

I imagine if you use the 10-speed front STI...

I imagine if you use the 10-speed front STI lever, it'll work. Maybe.
Forum: Bicycle Mechanics
03-26-24, 12:42 PM
Replies: 39
Views: 1,273
Posted By oldbobcat

Right. Bicycle hydraulic brakes are...

Right.

Bicycle hydraulic brakes are self-adjusting. That's why when you squeeze the lever without a rotor between the pads you have to pry the caliper open to get the wheel back on. If you doubt...
Forum: Fitting Your Bike
03-26-24, 12:21 PM
Replies: 9
Views: 506
Posted By oldbobcat

A handlebar with the proper width and less reach.

A handlebar with the proper width and less reach.
Forum: Fitting Your Bike
03-25-24, 07:52 PM
Replies: 45
Views: 1,506
Posted By oldbobcat

And here's a cycling magazine cover from the days...

And here's a cycling magazine cover from the days when amateur fitters all said the handlebar should be level with the saddle, and elbow-to-fingertip from the saddle nose (1975). This illustrator...
Forum: Bicycle Mechanics
03-22-24, 10:07 AM
Replies: 29
Views: 971
Posted By oldbobcat

Thanks for bringing that one up. I was searching...

Thanks for bringing that one up. I was searching for it online and too lazy to measure the crank on my old Masi. Oh, for the good old days, when we could complete the first half of a club ride using...
Forum: Fitting Your Bike
03-21-24, 12:27 PM
Replies: 14
Views: 733
Posted By oldbobcat

Before purchasing more stuff, try rotating your...

Before purchasing more stuff, try rotating your handlebar so you have a flat spot to place your hands. As it is now, your hands are probably sliding down the bar into the crook of the STI levers. The...
Forum: Bicycle Mechanics
03-21-24, 09:57 AM
Replies: 29
Views: 971
Posted By oldbobcat

It's a good thing you weren't riding in the '70s,...

It's a good thing you weren't riding in the '70s, when Stronglight cranks had a BCD of 122 mm, Campagnolo (and Sugino), 135, and Shimano, 130. And there were 3- and 5-bolt spiders. 110 mm only...
Forum: Bicycle Mechanics
03-20-24, 07:15 PM
Replies: 29
Views: 971
Posted By oldbobcat

Better to break a cheap hanger than an expensive...

Better to break a cheap hanger than an expensive derailleur.

But tell you what. Somebody here, come up with a derailleur hanger design and convince all the manufacturers that they should start...
Forum: Bicycle Mechanics
03-20-24, 01:43 PM
Replies: 8
Views: 478
Posted By oldbobcat

If FBinNY's advice still doesn't work, and you...

If FBinNY's advice still doesn't work, and you have confirmed that this is a linear pull (V) brake, it might be because the plastic cover that often anchors the return spring is broken. This is easy...
Forum: Bicycle Mechanics
03-19-24, 06:08 PM
Replies: 7
Views: 325
Posted By oldbobcat

Residue from brown axle grease. After cleaning,...

Residue from brown axle grease. After cleaning, polish with Simichrome or Glass Wax.
Forum: Bicycle Mechanics
03-18-24, 01:35 PM
Replies: 12
Views: 490
Posted By oldbobcat

I can tell you tubeless doesn't work on Mavic...

I can tell you tubeless doesn't work on Mavic Ksyrium SLs.
Forum: Fitting Your Bike
03-16-24, 07:37 PM
Replies: 45
Views: 1,506
Posted By oldbobcat

This guy explains it better than I can....

This guy explains it better than I can. https://www.youtube.com/watch?v=ZbuK4-HXhxY
Forum: Fitting Your Bike
03-12-24, 07:49 PM
Replies: 51
Views: 2,165
Posted By oldbobcat

Hinault rode for Renault-Elf in 1980, when he got...

Hinault rode for Renault-Elf in 1980, when he got tendonitis. Cyrille Guimarde was the DS.
Forum: Fitting Your Bike
03-12-24, 04:43 PM
Replies: 51
Views: 2,165
Posted By oldbobcat

Photos of Greg as a Junior beating the Senior I's...

Photos of Greg as a Junior beating the Senior I's show a pigeon-toed stance. That's one thing Eddy B. managed to fix. As for "heels on the pedal" to determine saddle height, it was more accurate with...
Forum: Fitting Your Bike
03-12-24, 04:32 PM
Replies: 51
Views: 2,165
Posted By oldbobcat

I never held a protractor up to one, but from the...

I never held a protractor up to one, but from the medium to larger sizes the seat tubes were considerably less than parallel to the head tubes. You could tell just by looking at them. Top tubes on...
Forum: Fitting Your Bike
03-12-24, 09:14 AM
Replies: 51
Views: 2,165
Posted By oldbobcat

The LeMond era ushered in wider handlebars,...

The LeMond era ushered in wider handlebars, longer cranks, bigger gears, longer reach, and Look and Time pedals. You had to be super-attuned to your cleat positioning, or have friends who were. Body...
Forum: Fitting Your Bike
03-11-24, 01:11 PM
Replies: 45
Views: 1,506
Posted By oldbobcat

Thank you.

Thank you.
Forum: Fitting Your Bike
03-10-24, 07:50 PM
Replies: 4
Views: 304
Posted By oldbobcat

Chris Froome tends to stick his elbows out, too,...

Chris Froome tends to stick his elbows out, too, and everybody does it in a full-out sprint.

Sticking your elbows out could be an old habit or it could be the result of a handlebar angle that...
Forum: Fitting Your Bike
03-10-24, 07:23 PM
Replies: 45
Views: 1,506
Posted By oldbobcat

Well, all I can tell you is that the headtube on...

Well, all I can tell you is that the headtube on the Planet X is taller and you won't be able to load it up with spacers because the steerer is already cut, and it's most likely that the top tube is...
Forum: Fitting Your Bike
03-10-24, 06:45 PM
Replies: 45
Views: 1,506
Posted By oldbobcat

So did you like it when it was "right?" Or if...

So did you like it when it was "right?" Or if it's not "right" now, what is preventing you from achieving "rightness?" I am totally confused now. You complain about pain, but you post dated photos....
Forum: Fitting Your Bike
03-10-24, 04:26 PM
Replies: 45
Views: 1,506
Posted By oldbobcat

Here's an old Boy Scout skill. Use a stick to...

Here's an old Boy Scout skill. Use a stick to measure something whose size you don't know by comparing its projection to something you do know. In this case I used a pencil to compare the head tubes...
Forum: Fitting Your Bike
03-10-24, 10:38 AM
Replies: 45
Views: 1,506
Posted By oldbobcat

No, but with the the taller cone, extra spacers,...

No, but with the the taller cone, extra spacers, and positive flip of the stem, its handlebar is visibly a couple centimeters higher. Look at the height of the handlebar ends in relation to the head...
Forum: Bicycle Mechanics
03-09-24, 12:38 PM
Replies: 5
Views: 317
Posted By oldbobcat

I like your understatement. An awl or dental...

I like your understatement.

An awl or dental pic might help to push it through, too, and remove any stray strands. An old spoke sharpened on a bench grinder makes a dandy dental pick.
Forum: Bicycle Mechanics
03-09-24, 12:30 PM
Replies: 36
Views: 876
Posted By oldbobcat

Your first job is to figure out where the...

Your first job is to figure out where the looseness is. Is it the crank interface to the spindle or is it the spindle interface to the frame? You should be able to figure this out without taking...
Forum: Fifty Plus (50+)
03-09-24, 12:25 PM
Replies: 118
Views: 7,824
Posted By oldbobcat

Hard to believe this thread's been going for 15...

Hard to believe this thread's been going for 15 years.

No, it isn't. It's still relevant.
Forum: Fitting Your Bike
03-08-24, 09:33 PM
Replies: 45
Views: 1,506
Posted By oldbobcat

Nice bike. Nothing weird about the geometry or...

Nice bike. Nothing weird about the geometry or the setup. Handlebar is definitely not too high, unless your fingertips hang down to your knees. Looks like something I'd ride if I was 3 inches taller....
Forum: Fitting Your Bike
03-08-24, 01:12 PM
Replies: 12
Views: 786
Posted By oldbobcat

That's the way it was done back in the day. And...

That's the way it was done back in the day. And it's so wrong. And maybe you could ride a 56 that's almost as big as the 58 you're already on, but hey, that's splitting hairs.
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