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Search: Posts Made By: mpetry912
Showing results 1 to 50 of 1000
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Forum: Bicycle Mechanics
05-27-24, 11:20 AM
Replies: 28
Views: 352
Posted By mpetry912

a breakage like that is most likely due to...

a breakage like that is most likely due to incomplete thread engagement in the nipple, which causes a stress riser as shown.

I'd suggest you replace all of the nipples and re-true the wheel. ...
Forum: General Cycling Discussion
05-27-24, 11:02 AM
Replies: 21
Views: 327
Posted By mpetry912

this is not a problem that can be solved with...

this is not a problem that can be solved with "more laws" in my opinion.

sadly it creates more resentment towards bicyclists by non cyclists.

/markp
Forum: General Cycling Discussion
05-26-24, 12:46 PM
Replies: 52
Views: 1,141
Posted By mpetry912

every hour I can spend NOT looking at the phone...

every hour I can spend NOT looking at the phone is good. put it away. focus on the ride, not scrolling through FB

just sayin

/markp
Forum: Classic & Vintage
05-26-24, 09:00 AM
Replies: 9
Views: 321
Posted By mpetry912

it's a nice old bike and bet it has a nice ride. ...

it's a nice old bike and bet it has a nice ride. Treat yourself to some Dia Compe GS levers with rubber hoods, and maybe some Vittoria Corsa tires in 28 x 700

maybe go thru all the cables,...
Forum: Bicycle Mechanics
05-20-24, 09:16 AM
Replies: 13
Views: 427
Posted By mpetry912

it does indeed. However with a triple your...

it does indeed. However with a triple your adjustments become more critical. Derailleur alignment and chain length expecially.

/markp
Forum: Classic & Vintage
05-19-24, 10:40 AM
Replies: 143
Views: 5,121
Posted By mpetry912

That's a real nice bike Portlandjim Had not...

That's a real nice bike Portlandjim Had not seen the final pinstriping.

I think the object of restoration or modification, be it bike (or car, or whatever) should be an expression of the owner's...
Forum: Bicycle Mechanics
05-19-24, 08:48 AM
Replies: 13
Views: 427
Posted By mpetry912

+1 on the classic 1037, they are great. Will...

+1 on the classic 1037, they are great. Will shift most triples.

pro tip - find a middle chainring with ramps and pins. this will be a mountain bike part. Really makes coming off the small ring...
Forum: Bicycle Mechanics
05-18-24, 07:48 AM
Replies: 39
Views: 988
Posted By mpetry912

it is probably fractions of a percent in terms of...

it is probably fractions of a percent in terms of lower "friction". The ceramic balls are harder, and they deform less under load. Probably about the same advantage as you'd get from high end...
Forum: Classic & Vintage
05-18-24, 07:41 AM
Replies: 17
Views: 514
Posted By mpetry912

just keep an eye on the gap where the thru bolt...

just keep an eye on the gap where the thru bolt clamps down on the seat tube. on french bikes with metric tubes you may need to make a little shim out of brass to ensure you get a good fit.
...
Forum: Bicycle Mechanics
05-09-24, 07:19 PM
Replies: 9
Views: 262
Posted By mpetry912

if this first version is supported by the Shimano...

if this first version is supported by the Shimano software, I'd suggest trying to do a software update

/markp
Forum: Classic & Vintage
05-08-24, 07:05 PM
Replies: 19
Views: 552
Posted By mpetry912

yes #619 does fit down into the upper derailleur...

yes #619 does fit down into the upper derailleur body

/markp
Forum: Bicycle Mechanics
05-08-24, 01:02 PM
Replies: 45
Views: 1,523
Posted By mpetry912

I like this chain indicator. it's longer than...

I like this chain indicator. it's longer than the other tools and therefore the span of measured chain is longer, so more accurate, which is why the little short tools don't work. Can't measure...
Forum: General Cycling Discussion
05-08-24, 12:37 PM
Replies: 19
Views: 639
Posted By mpetry912

the tool is helpful but for most derailleur...

the tool is helpful but for most derailleur hanger alignment problems I have found you can eyeball it. you want to be sure that the derailleur pulleys are in the same plane as the cogs.

you can...
Forum: Electric Bikes
05-08-24, 12:12 PM
Replies: 7
Views: 581
Posted By mpetry912

all good points stated above. Choose a bike that...

all good points stated above. Choose a bike that uses a well known brand of motor / controller. The el cheapo units costing sub 1000 bucks from AMZN will only disappoint you and they are not...
Forum: Electric Bikes
05-08-24, 11:47 AM
Replies: 20
Views: 746
Posted By mpetry912

gut feel this is an iffy thing. notwithstanding...

gut feel this is an iffy thing. notwithstanding the fact that you have to carry a big heavy charger with you, I would worry that the hotel would not allow you to bring the bikes into the room.
...
Forum: Classic & Vintage
05-06-24, 02:53 PM
Replies: 27
Views: 860
Posted By mpetry912

putting "Left crank arm" into ebay I get many...

putting "Left crank arm" into ebay I get many options for under 20 bucks.

but what do I know ?

/markp
Forum: Classic & Vintage
05-06-24, 02:40 PM
Replies: 27
Views: 860
Posted By mpetry912

with a crack like that the arm will never stay...

with a crack like that the arm will never stay tight. You can find a replacement on ebay or other source.

/markp
Forum: Classic & Vintage
05-06-24, 01:38 PM
Replies: 14
Views: 608
Posted By mpetry912

I was going to say Whitcomb based on that wrap...

I was going to say Whitcomb based on that wrap over seat stay but the Mercian is a very good guess.

/markp
Forum: Classic & Vintage
05-06-24, 01:36 PM
Replies: 20
Views: 576
Posted By mpetry912

it has many interesting uses but one should...

it has many interesting uses but one should always check the results.

I recently did a project where I translated about 30 JSON files into Spanish.

Normally this would be a job for an intern...
Forum: Classic & Vintage
05-06-24, 11:11 AM
Replies: 20
Views: 576
Posted By mpetry912

yes, of course. I purposely left the details...

yes, of course.

I purposely left the details somewhat ambiguous to see how the model would handle the query.

/markp
Forum: Classic & Vintage
05-06-24, 11:04 AM
Replies: 20
Views: 576
Posted By mpetry912

It did not get the answer right ! I attribute...

It did not get the answer right ! I attribute that to the hub dimensions (flange diameter and spacing).

I purposely kept those details ambiguous. But yes, pretty impressive response.

/markp
Forum: Classic & Vintage
05-06-24, 10:52 AM
Replies: 20
Views: 576
Posted By mpetry912

Can AI Calculate spoke length ?

I spoke with a good friend on the phone this morning and one of the things we talked about was "could AI calculate spoke lengths". Interesting question.

So my prompt to ChatGPT (I have a premium...
Forum: Classic & Vintage
05-06-24, 10:38 AM
Replies: 46
Views: 1,443
Posted By mpetry912

Oh Matt that totally sucks ! hope the trip...

Oh Matt that totally sucks !

hope the trip home was not too difficult

/markp
Forum: Classic & Vintage
05-05-24, 10:25 PM
Replies: 6
Views: 300
Posted By mpetry912

BertoBerg looks like there are SOME parts in...

BertoBerg looks like there are SOME parts in there but you should assume that the hardware kit is not complete

Easy to find on ebay

/markp
Forum: Classic & Vintage
05-05-24, 10:07 PM
Replies: 6
Views: 300
Posted By mpetry912

these are later model post 1978 Catalog Ref...

these are later model post 1978

Catalog Ref #601 and 602

they do not look new despite the bag and I do not see the necessary spacers and bushings

/markp
Forum: Classic & Vintage
05-05-24, 09:02 PM
Replies: 5
Views: 326
Posted By mpetry912

looking forward to a ride report on this one. ...

looking forward to a ride report on this one. Quinns were supposed to have pretty radical handling and geometry.

/markp
Forum: Classic & Vintage
05-05-24, 08:32 PM
Replies: 8
Views: 330
Posted By mpetry912

on the rear assuming 126 OLD and 40 spokes 3...

on the rear assuming 126 OLD and 40 spokes 3 cross to 612 ERD I'm getting

293.6 for the NDS (round up to 294)
291.8 for the DS (round up to 292)

for the front 295.4 or round up to 296
...
Forum: Classic & Vintage
05-05-24, 07:41 PM
Replies: 8
Views: 330
Posted By mpetry912

what rims are you using ? I can run that thru...

what rims are you using ? I can run that thru my tool here.

/markp
Forum: Classic & Vintage
05-05-24, 07:22 PM
Replies: 8
Views: 330
Posted By mpetry912

it would be helpful to know what rims you are...

it would be helpful to know what rims you are using and what cross - 3x (recommended) or 4x ??

help us help you

/markp
Forum: Classic & Vintage
05-05-24, 07:15 PM
Replies: 8
Views: 330
Posted By mpetry912

for the early 3 piece Phil hubs I have used these...

for the early 3 piece Phil hubs I have used these dimensions with good result

special note: Some Phil rear hubs were spaced to customer request. Measure twice, cut once, as Phil himself told me in...
Forum: Bicycle Mechanics
05-05-24, 02:23 PM
Replies: 57
Views: 1,588
Posted By mpetry912

Like wear bars on a tire ! so I guess that rim...

Like wear bars on a tire ! so I guess that rim has lots of miles left in it

/markp
Forum: Bicycle Mechanics
05-05-24, 08:58 AM
Replies: 57
Views: 1,588
Posted By mpetry912

that sidewall looks pretty badly scored. ...

that sidewall looks pretty badly scored.

here in the Pac NW we have seen the black crud from winter riding become an abrasive and wear thru rim sidewalls over several seasons.

I know of at...
Forum: Classic & Vintage
05-05-24, 08:54 AM
Replies: 19
Views: 552
Posted By mpetry912

depending on the frame's braze ons you may need...

depending on the frame's braze ons you may need the special stepped end piece.

hard to find. I have a few.

/markp
Forum: General Cycling Discussion
05-05-24, 08:44 AM
Replies: 11
Views: 481
Posted By mpetry912

ridewithGPS is so much better than Strava it's...

ridewithGPS is so much better than Strava it's not even funny

/markp
Forum: Classic & Vintage
05-04-24, 02:58 PM
Replies: 50
Views: 2,024
Posted By mpetry912

unworthy1 I have never seen a headset top nut...

unworthy1 I have never seen a headset top nut like that ! pretty cool

/markp
Forum: Bicycle Mechanics
05-04-24, 02:54 PM
Replies: 5
Views: 196
Posted By mpetry912

they are probably just manufacturing lot numbers....

they are probably just manufacturing lot numbers.

not a detail worth worrying about.

there MAY be "left" and "right" pads on your brake, but at least the 8000 series pads that I have will...
Forum: Bicycle Mechanics
05-04-24, 11:19 AM
Replies: 45
Views: 1,523
Posted By mpetry912

Sorry to disappoint you but you've answered your...

Sorry to disappoint you but you've answered your own question. The steel rule method is good.

/markp
Forum: Bicycle Mechanics
05-04-24, 11:16 AM
Replies: 46
Views: 1,774
Posted By mpetry912

depends on where you live. I use just a quick...

depends on where you live. I use just a quick spritz of automotive degreaser, and then soapy water (dawn ultra) with a splash of kerosene, scrub with a toothbrush, spray rinse with hose, blow off...
Forum: Classic & Vintage
04-30-24, 05:24 PM
Replies: 44
Views: 1,351
Posted By mpetry912

if you still have the bike apart and have 2 spare...

if you still have the bike apart and have 2 spare balls, running loose balls in the lower cup is a good thing.

just turn it upside down to assemble, and use a sticky grease.

/markp
Forum: Classic & Vintage
04-30-24, 04:24 PM
Replies: 131
Views: 11,395
Posted By mpetry912

the Dinucci /markp ...

the Dinucci

/markp

https://cimg7.ibsrv.net/gimg/bikeforums.net-vbulletin/1934x1283/atbeach_apr24_d1d78584539c63f69055cc34f24ef4b38180f9e4.jpg
Forum: Classic & Vintage
04-30-24, 09:41 AM
Replies: 26
Views: 914
Posted By mpetry912

repechage will know if anyone does /markp

repechage will know if anyone does

/markp
Forum: Classic & Vintage
04-28-24, 01:17 PM
Replies: 73
Views: 2,579
Posted By mpetry912

the teeter totter argument is not right. ...

the teeter totter argument is not right.

Imagine two kids, 50 lb each, on the seats, one one each side of the teeter totter. up, down, up down.

now one kid dismounts and sits on on the...
Forum: Classic & Vintage
04-28-24, 12:53 PM
Replies: 44
Views: 1,351
Posted By mpetry912

don't trim the fork. Add a thin headset spacer. ...

don't trim the fork. Add a thin headset spacer.

/markp
Forum: Classic & Vintage
04-28-24, 07:57 AM
Replies: 73
Views: 2,579
Posted By mpetry912

torque is expressed as length of the lever arm...

torque is expressed as length of the lever arm and the force applied. Foot-pounds, newton-meters etc.

the accurate application of a torque value is achieved by having your hand on the handle, as...
Forum: Classic & Vintage
04-26-24, 01:06 PM
Replies: 14
Views: 629
Posted By mpetry912

that's a real neat part, I especially like the...

that's a real neat part, I especially like the colleted upper nut that compresses as you tighten it.

that said, I would not install that on a bike I was going to ride. No spare parts available and...
Forum: Classic & Vintage
04-26-24, 12:08 PM
Replies: 73
Views: 2,579
Posted By mpetry912

I would suggest to you that 300 inch / lb is too...

I would suggest to you that 300 inch / lb is too much torque for Campy cranks. I believe you are at risk of splitting the arms at that torque level.

Campy arms are quite soft and just blindly...
Forum: Classic & Vintage
04-26-24, 11:46 AM
Replies: 9
Views: 459
Posted By mpetry912

who makes this one ? haha /markp ...

who makes this one ? haha

/markp
https://cimg8.ibsrv.net/gimg/bikeforums.net-vbulletin/646x764/silca_cage_rainbow_b4399408d9e2683a28f8135adbd8b81749a9ecde.jpg
Forum: General Cycling Discussion
04-24-24, 03:34 PM
Replies: 27
Views: 1,392
Posted By mpetry912

Agreed. Same discussion with riders who insist...

Agreed. Same discussion with riders who insist that their wheels are tensioned to 140KgF. Why ? Because they saw it in a GCN video on YouTube.

If you want to run equipment that is super...
Forum: General Cycling Discussion
04-24-24, 03:30 PM
Replies: 6
Views: 366
Posted By mpetry912

I think maybe you bought a size too small ? or...

I think maybe you bought a size too small ? or the heel tab is just too tall ?

that said, the Shimano shoes have gotten narrower over the last few years. The latest pair I bought was just too...
Forum: Bicycle Mechanics
04-24-24, 01:03 PM
Replies: 23
Views: 640
Posted By mpetry912

Mine /markp ...

Mine

/markp

https://cimg4.ibsrv.net/gimg/bikeforums.net-vbulletin/747x516/912toolkit1_d409d3b1196dc33f8cb12875970ede3e5f52b098.jpg
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