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Search: Posts Made By: cpach
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08-05-20, 03:10 AM
Replies: 3
Views: 120
Posted By cpach

My guess is this bike was a complete and...

My guess is this bike was a complete and converted to 1x aftermarket. These bikes usually come with spare frame parts but the odds of them being included in the sale are low (though I do it).

If I...
08-05-20, 03:08 AM
Replies: 9
Views: 319
Posted By cpach

It's possible the power is poor also because more...

It's possible the power is poor also because more recent Shimano brakes use a revised cable pull ratio--the lever pulls more cable over its throw, so when used with Sram/Campagnolo and older Shimano...
08-04-20, 04:36 PM
Replies: 12
Views: 316
Posted By cpach

Bearings are worn if, with the crank removed, you...

Bearings are worn if, with the crank removed, you turn them by hand and they feel crunchy, or if they have play that you can't eliminate with preload.
Your LBS should be able to face and chase. If...
08-04-20, 04:25 PM
Replies: 3
Views: 120
Posted By cpach

A lot of Giant dealers will have some of those...

A lot of Giant dealers will have some of those sitting in a drawer somewhere. Things are wild with Covid, but hopefully if you call around someone will have one.

Also I haven't built one of those...
08-04-20, 04:20 PM
Replies: 24
Views: 442
Posted By cpach

First thing I'd do is cut the existing spokes out...

First thing I'd do is cut the existing spokes out and see if the rim is straight without tension. If it is, there's no other sign of damage, and wear is acceptable, it's fine to reuse.
If the hub is...
08-04-20, 04:09 PM
Replies: 12
Views: 316
Posted By cpach

Before you give up on Dub, you may want to have...

Before you give up on Dub, you may want to have your BB shell faced and chased. All external bearing bottom brackets are fairly sensitive to misalignment of the shell.

Worn bearings will make...
08-04-20, 04:05 PM
Replies: 10
Views: 243
Posted By cpach

There aren't good flat mount to post mount...

There aren't good flat mount to post mount converters, so your best bet is to use a MTB flat mount caliper. That SLX caliper should work OK--they're both BH90 hoses and have Servo-wave.
08-04-20, 01:24 AM
Replies: 31
Views: 591
Posted By cpach

https://www.sheldonbrown.com/gear-calc.html, very...

https://www.sheldonbrown.com/gear-calc.html, very useful.
08-04-20, 01:22 AM
Replies: 17
Views: 346
Posted By cpach

I suspect a 7 speed freewheel will fit. If not,...

I suspect a 7 speed freewheel will fit. If not, maybe try just a 1mm spacer on the DS--being 1mm out of dish probably is imperceptible.

As I mentioned, 7 speed and 8 speed spacing is .2mm...
08-04-20, 01:19 AM
Replies: 12
Views: 277
Posted By cpach

In the scenario you're laying out, the derailleur...

In the scenario you're laying out, the derailleur would not be my first guess.

More likely issues:
-Cable friction. You should definitely replace the cable and housing if you haven't already....
08-03-20, 01:24 PM
Replies: 17
Views: 346
Posted By cpach

The length difference is 1.4mm between a Shimano...

The length difference is 1.4mm between a Shimano 6 speed and 7 speed freewheel. If you have indexed 8 speed shifters you're trying to use, a 7 speed freewheel might fit with acceptable clearance, and...
08-03-20, 01:18 PM
Replies: 2
Views: 109
Posted By cpach

Could you post the exact part numbers of the...

Could you post the exact part numbers of the crank and FD? It sounds like they may not, actually, be compatible.
08-03-20, 01:13 PM
Replies: 23
Views: 574
Posted By cpach

Wow, it's shocking you can buy a cheap road bike...

Wow, it's shocking you can buy a cheap road bike with such steeep gearing today.

Not sure what's up with the bike without it in my hands, it sounds like you're doing a pretty good job trying to...
08-03-20, 12:52 PM
Replies: 8
Views: 163
Posted By cpach

You know that Shimano NA has several US offices,...

You know that Shimano NA has several US offices, right? I'm not sure how it is consumer facing, but working at a dealer their technical support staff are actually pretty knowledgeable and competent....
08-03-20, 12:19 PM
Replies: 17
Views: 346
Posted By cpach

What's the hub/frame spacing? Given this is a...

What's the hub/frame spacing? Given this is a tandem increasing dish may result in an unacceptable tension differential. If your bicycle frame is steel, perhaps consider also having the rear spacing...
08-03-20, 11:50 AM
Replies: 21
Views: 453
Posted By cpach

I'm going to go against the grain and mention...

I'm going to go against the grain and mention that I actually rather like multi tools, and I'm a pro mechanic for whatever that's worth. My bikes don't go out of the door unless they're running well...
08-03-20, 11:42 AM
Replies: 14
Views: 337
Posted By cpach

It's a nice riding out there though? I have...

It's a nice riding out there though? I have amazing riding around me now, but I'm nostalgic for riding in Santa Cruz. Oh well, get to reminisce when I visit the inlaws.

It used to be nice being...
08-03-20, 11:40 AM
Replies: 9
Views: 191
Posted By cpach

You can use whatever Shimano HT2 crank in that BB.

You can use whatever Shimano HT2 crank in that BB.
08-03-20, 11:38 AM
Replies: 31
Views: 591
Posted By cpach

https://cimg7.ibsrv.net/gimg/bikeforums.net-vbulle...

https://cimg7.ibsrv.net/gimg/bikeforums.net-vbulletin/447x1146/screen_shot_2020_08_03_at_10_35_28_am_21ae95f81d0aba953d442ebea84f978324bf79eb.png
Stop being a curmudgeon, shift up one gear and...
08-02-20, 01:15 AM
Replies: 8
Views: 213
Posted By cpach

If it's something actually worth servicing its...

If it's something actually worth servicing its better to replace the bushings relatively early, but for a cheap bike run it. You'll almost certainly be too annoyed by the play before it's unsafe.
08-02-20, 12:17 AM
Replies: 8
Views: 264
Posted By cpach

It's not what I'd spec for your use, even given...

It's not what I'd spec for your use, even given your pretty darn light weight, but if you have parts in hand it's likely to be fine. Make sure to get rear tension as high and as even as you can.
08-02-20, 12:06 AM
Replies: 6
Views: 219
Posted By cpach

In my experience they all work really well....

In my experience they all work really well. BR-R7000 has better pads with retainers, but the Sora/Tiagra pads work fine and can be replaced with two piece brake pads in the future.
08-01-20, 06:08 PM
Replies: 4
Views: 125
Posted By cpach

Altering the width of the crank will effect the...

Altering the width of the crank will effect the chainline of the crank and make your drivetrain run worse. I agree that pedal extenders are strong enough and are the better option.

The other thing...
08-01-20, 06:05 PM
Replies: 12
Views: 245
Posted By cpach

Also if using a QR, make sure it's an internal...

Also if using a QR, make sure it's an internal cam type, like Shimano. External cam QRs are not appropriate for horizontal dropouts.
08-01-20, 06:03 PM
Replies: 10
Views: 238
Posted By cpach

Maybe try Altus FD-M371 . It's 9 speed, but for...

Maybe try Altus FD-M371 . It's 9 speed, but for front derailleurs the difference is extremely minimal, and it is designed around a 48t chainring and 50mm chainline. You would have to friction shift...
08-01-20, 05:55 PM
Replies: 21
Views: 329
Posted By cpach

So mechanically I think that filing it off is...

So mechanically I think that filing it off is inadvisable and you're unlikely to get a very uniform finish using a filler. I don't know if you're attached to the utilitarian look of the plain steel,...
08-01-20, 05:38 PM
Replies: 31
Views: 591
Posted By cpach

To be frank, you probably don't need the 52 over...

To be frank, you probably don't need the 52 over a 50. A 52 is only really useful if:
-You're trying to avoid needing an 11t cog, but 12 and 13t starting cogs are getting rare anyways.
-You...
08-01-20, 05:33 PM
Replies: 23
Views: 513
Posted By cpach

It's obvious I don't super-love Rad, but I've...

It's obvious I don't super-love Rad, but I've often wondered if the wheels wouldn't actually be better of with 14g or at least 13g spokes. I don't think the motor torque exceeds that of heavy disc...
08-01-20, 10:30 AM
Replies: 8
Views: 279
Posted By cpach

Why do you need to replace the crank? Triples are...

Why do you need to replace the crank? Triples are really hard to find and so are very short cranks. Maybe...
08-01-20, 10:09 AM
Replies: 31
Views: 591
Posted By cpach

It would change your top gear and you would get...

It would change your top gear and you would get better shifting with a matching front derailleur but there's no reason you need 130bcd of you're switching cranks.
08-01-20, 02:57 AM
Replies: 6
Views: 172
Posted By cpach

It'll probably work with the appropriate hose,...

It'll probably work with the appropriate hose, but the modulation may not be as intended and without it being on Shimano's compatibility charts they may feel unsure about guaranteeing it. They both...
08-01-20, 02:45 AM
Replies: 5
Views: 176
Posted By cpach

Partly what you're getting is a mismatch in...

Partly what you're getting is a mismatch in intended chainline between the crankset and front derailleur. Shimano chainline spec is nominally 43.5mm and SRAM eTap is 45mm, so theoretically if you...
08-01-20, 02:30 AM
Replies: 31
Views: 591
Posted By cpach

Ugh, older FSA chainrings are nothing to look...

Ugh, older FSA chainrings are nothing to look forward to. If the chainrings aren't skipping on the new chain and are shifting OK, leave them in place until one of those things comes up. Maybe set up...
08-01-20, 01:44 AM
Replies: 14
Views: 337
Posted By cpach

It's chosen in part because it's available in a...

It's chosen in part because it's available in a 48x32 gearing. Praxis makes extremely nice chainrings so the shifting is on par with Shimano, and in general the manufacturing quality is excellent....
08-01-20, 01:39 AM
Replies: 23
Views: 513
Posted By cpach

If you're having spoke failures on that bike, I'd...

If you're having spoke failures on that bike, I'd recommend taking it to a good bike shop that can also sort a correct replacement spoke/nipple and spend a significant amount of time correcting the...
08-01-20, 01:31 AM
Replies: 32
Views: 742
Posted By cpach

Glad it's working out, sounds like a sweet bike.

Glad it's working out, sounds like a sweet bike.
08-01-20, 01:20 AM
Replies: 8
Views: 234
Posted By cpach

Experienced mechanics tend to scoff a little at...

Experienced mechanics tend to scoff a little at bikes being turned upside down. It's not mechanically necessarily terrible, but it's really easy to knock the bike over and it scuffs up your saddle...
08-01-20, 01:09 AM
Replies: 19
Views: 469
Posted By cpach

I've never seen one and I've worked in some...

I've never seen one and I've worked in some relatively high production shops, though they might exist. In a commercial setting, most cartridge bearings aren't cleaned because the cost quickly becomes...
08-01-20, 01:05 AM
Replies: 25
Views: 438
Posted By cpach

Technically the Sora chainrings are spaced very...

Technically the Sora chainrings are spaced very slightly differently for 9 speed than 10. I'd agree that's probably a slightly better idea, but I can almost guarantee you the 10 speed rings will...
08-01-20, 01:00 AM
Replies: 28
Views: 494
Posted By cpach

If you have poor service life in the future ask...

If you have poor service life in the future ask to see if you can have the bottom bracket shell faced and chased. External bearing BBs are relatively sensitive to bearing shells that are out of...
07-31-20, 01:25 AM
Replies: 25
Views: 438
Posted By cpach

Anyhow, that all looks fine. I'd probably do a...

Anyhow, that all looks fine. I'd probably do a Shimano chain on a Shimano crank/cassette, though the Sram will work. You can always get a KMC missing link for a Shimano chain if you want.
07-30-20, 01:40 PM
Replies: 11
Views: 364
Posted By cpach

I mean, that amount of rust by the headtube cups...

I mean, that amount of rust by the headtube cups isn't a clear indicator that the rest of the frame is compromised or anything, it's just something you should probably check out. It IS a really sweet...
07-30-20, 12:51 PM
Replies: 32
Views: 742
Posted By cpach

I'm a pro mechanic but I don't frame prep...

I'm a pro mechanic but I don't frame prep handbuilt frames often, but 0.3mm sounds likely given how much tubes can distort from heat. I strongly suspect its intended to be reamed for an EC30 HS.
07-30-20, 12:39 PM
Replies: 15
Views: 402
Posted By cpach

It will not work well. Stop asking for advise...

It will not work well.
Stop asking for advise if you plan to ignore all of it.
07-30-20, 12:32 PM
Replies: 11
Views: 233
Posted By cpach

This is essentially true advise, but it has...

This is essentially true advise, but it has become less true over time as the exact shaping of the crank near the chainrings is more likely to have interference and require filing to fit, and...
07-30-20, 12:29 PM
Replies: 32
Views: 742
Posted By cpach

I'd take this to the framebuilders forum. ...

I'd take this to the framebuilders forum.

Did the frame look like it had been reamed before shipping? I've only ever built one frame in a class, but to my memory the tubing ID is undersize so that...
07-30-20, 12:12 PM
Replies: 8
Views: 279
Posted By cpach

To help you, relavent information would be: ...

To help you, relavent information would be:
-Gearing of the crankset (what tooth counts on the chainrings, and how many of them)
-Bottom bracket shell of the bike--GXP can fit on a bunch of (almost...
07-30-20, 12:03 PM
Replies: 11
Views: 233
Posted By cpach

I'd like to say you should replace the...

I'd like to say you should replace the chainrings, but particularly given that your crank isn't particularly pricy you'll almost certainly save money just buying a new triple crank. 52/39/30 is...
07-29-20, 03:33 PM
Replies: 15
Views: 402
Posted By cpach

Cable pull ratio is different and this will never...

Cable pull ratio is different and this will never work well.

Mixing 10 and 11 speed Shimano MTB stuff works better because Dynasys derailleurs have the same cable pull ratio.
07-29-20, 03:30 PM
Replies: 10
Views: 365
Posted By cpach

The ergonomics of that look pretty bad if you're...

The ergonomics of that look pretty bad if you're doing any real work on a bike.
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