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Search: Posts Made By: mpetry912
Showing results 1 to 50 of 1000
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Forum: Bicycle Mechanics
05-20-24, 09:16 AM
Replies: 12
Views: 299
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: 82
Views: 2,525
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: 12
Views: 299
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: 875
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: 456
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: 245
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: 519
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: 1,419
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: 603
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: 539
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: 19
Views: 626
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: 825
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: 825
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: 592
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: 550
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: 550
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: 550
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: 550
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: 1,385
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: 284
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: 284
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: 311
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: 309
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: 309
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: 309
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: 309
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: 1,519
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: 1,519
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: 519
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: 456
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: 1,930
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: 190
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: 1,419
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: 1,667
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: 1,291
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: 11,304
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: 855
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: 2,460
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: 1,291
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: 2,460
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: 593
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: 2,460
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: 445
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: 1,289
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: 347
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: 613
Posted By mpetry912

Mine /markp ...

Mine

/markp

https://cimg4.ibsrv.net/gimg/bikeforums.net-vbulletin/747x516/912toolkit1_d409d3b1196dc33f8cb12875970ede3e5f52b098.jpg
Forum: Bicycle Mechanics
04-24-24, 08:59 AM
Replies: 38
Views: 1,193
Posted By mpetry912

I looked at the pics and I see several things but...

I looked at the pics and I see several things but this is the big problem. Either the brake posts are assymetric (unlikely) or you have something else set up wrong on the brakes. I disagree with your...
Forum: General Cycling Discussion
04-22-24, 08:31 AM
Replies: 29
Views: 1,181
Posted By mpetry912

that's the one with the single leg fork ! never...

that's the one with the single leg fork ! never looked right to me.

too much bending moment on the front axle.

/markp
Forum: Classic & Vintage
04-21-24, 06:51 PM
Replies: 29
Views: 1,400
Posted By mpetry912

maybe a 35 Rear and 32 front? larger frames...

maybe a 35 Rear and 32 front?

larger frames tend to have more of the weight distribution on the rear wheel.

yes, very nice bike

/markp
Forum: Bicycle Mechanics
04-21-24, 02:03 PM
Replies: 40
Views: 1,802
Posted By mpetry912

suggest you use LESS pressure - just a few PSI -...

suggest you use LESS pressure - just a few PSI - when installing.

these tubes are quite stretchy

/markp
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