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Search: Posts Made By: cpach
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04-06-21, 01:28 AM
Replies: 42
Views: 765
Posted By cpach

There's nothing intrinsic about tubeless tires...

There's nothing intrinsic about tubeless tires that will make them flat less often when used with a tube. They have a higher tolerance, stronger bead and usually some reinforcement in the sidewall,...
04-02-21, 09:02 PM
Replies: 9
Views: 294
Posted By cpach

No, they've fallen out of fashion (I personally...

No, they've fallen out of fashion (I personally don't like them either) and haven't been available past 10 speed. As mentioned, you have options with Di2.
04-02-21, 08:21 PM
Replies: 6
Views: 274
Posted By cpach

Generally, for 1x you usually size the chain over...

Generally, for 1x you usually size the chain over the largest cog and the chainring and add 4 links (instead of 2 for most multi chainring drivetrains), which is what I'd recommend in this case.
04-02-21, 08:13 PM
Replies: 12
Views: 416
Posted By cpach

Semi-obviously a good work stand. My personal...

Semi-obviously a good work stand. My personal favorite portable/non shop stand is the Feedback Sports Elite, but it's pricy. Park PCS-10 is what I had for like a decade personally and it's fine.
...
04-02-21, 01:01 AM
Replies: 38
Views: 990
Posted By cpach

It's what's so infuriating about it! Totally nice...

It's what's so infuriating about it! Totally nice bike, horrendous hub options, particularly given the stock wheels SUCKED. Had a customer with a hub flange literally exploding and cracked rim...
04-02-21, 12:55 AM
Replies: 28
Views: 599
Posted By cpach

The Ksyrium thing was mostly to bring the DS...

The Ksyrium thing was mostly to bring the DS flange out a little farther without hitting the cassette, particularly with the stupid zircal spokes. It relies on the hub shell to transmit torque....
03-30-21, 12:18 AM
Replies: 8
Views: 244
Posted By cpach

Basically it doesn't really matter whether or not...

Basically it doesn't really matter whether or not you can see threads, but if the end of the spoke isn't past the wall of the rim a portion of the nipple will be in tension and not compression and...
03-30-21, 12:15 AM
Replies: 12
Views: 300
Posted By cpach

That looks fine. Chainrings are worn when: -The...

That looks fine. Chainrings are worn when:
-The chain skips or
-They shift poorly.

If neither is true, leave well enough alone.
03-30-21, 12:13 AM
Replies: 11
Views: 331
Posted By cpach

Sun CR-18s really are a pretty good budget...

Sun CR-18s really are a pretty good budget choice, so if your budget is stretched that really is a reasonable suggestion (assuming you don't ever plan on running tubeless). I like Velocity a...
03-30-21, 12:00 AM
Replies: 2
Views: 113
Posted By cpach

Mechanic A is correct (assuming a 2x or 3x...

Mechanic A is correct (assuming a 2x or 3x system, 4 links would be correct for most 1x drivetrains). Different suspension designs have differing amounts of chain growth as they move through their...
03-29-21, 11:57 PM
Replies: 10
Views: 368
Posted By cpach

Man, I wouldn't advise you to get that. Also that...

Man, I wouldn't advise you to get that. Also that bike looks like its had a bunch of ride time. If it weren't for the stay damage, I would strongly advise you to ask them about what kind of service...
03-29-21, 11:50 PM
Replies: 3
Views: 220
Posted By cpach

I wouldn't go anything cheaper than a XCT,...

I wouldn't go anything cheaper than a XCT, they're pretty much the cheapest thing that attempts actual hydraulic dampening. If you want your bike to feel very meaningfully better, probably the best...
03-29-21, 11:39 PM
Replies: 38
Views: 990
Posted By cpach

As a professional bike mechanic I friggin hate...

As a professional bike mechanic I friggin hate QRs with disc breaks. They are way less consistent in axle positioning and create disc rub. Also they are less stiff and create rub. They are also...
03-29-21, 11:28 PM
Replies: 28
Views: 599
Posted By cpach

Go for it if you want, it's fun and almost...

Go for it if you want, it's fun and almost entirely harmless. My personal road bike has a radial/2x 28h rear wheel, mostly because it looks neat and it was fun. It has held up fine, despite the very...
03-23-21, 12:31 AM
Replies: 13
Views: 432
Posted By cpach

Ideally all the spokes on one side should have...

Ideally all the spokes on one side should have similar tension. Do you have a musical ear? Within a semitone is probably OK, though when I build wheels I shoot for tighter tolerance than that on...
03-23-21, 12:27 AM
Replies: 12
Views: 319
Posted By cpach

To convert a bike from threaded to threadless...

To convert a bike from threaded to threadless requires replacing the fork, and also is not likely to reduce wear.

Replacing with a new threaded headset isn't that difficult or expensive,...
03-23-21, 12:23 AM
Replies: 7
Views: 268
Posted By cpach

TBH this sounds like a profoundly bad idea. A...

TBH this sounds like a profoundly bad idea. A failure to the head tube is really likely to result in a crash.

I know Covid has messed everything up, but are there any bike co-ops in your area that...
03-18-21, 11:41 PM
Replies: 28
Views: 951
Posted By cpach

I'm all about the PBMA trying to get mechanics up...

I'm all about the PBMA trying to get mechanics up to some sort of consistent standards of professionalism.

As far as tune-ups--ever notice how there's no such thing on, say, a car? They might have...
03-17-21, 06:08 PM
Replies: 28
Views: 951
Posted By cpach

I'm relatively unfond of the term tune-up....

I'm relatively unfond of the term tune-up. Service should be appropriate to the needs of the rider and bike and should be charged fairly relative to the shop's labor rate. Any service package should...
03-17-21, 11:31 AM
Replies: 5
Views: 343
Posted By cpach

Without seeing it honestly that sounds fine.

Without seeing it honestly that sounds fine.
03-17-21, 11:27 AM
Replies: 16
Views: 444
Posted By cpach

Go ahead and get relatively wide tires; they'll...

Go ahead and get relatively wide tires; they'll do better offroad and aren't really slower offroad. Given typical options, this means probably 2"–2.3". Maybe go for some minor tread in the front and...
03-15-21, 02:12 PM
Replies: 14
Views: 441
Posted By cpach

What's your budget? As a pro mechanic, the nicer...

What's your budget? As a pro mechanic, the nicer portable Park stands are petty nice but I personally prefer Feedback Sports—even more stable and a faster clamp design.

At the mid end of price...
03-15-21, 12:44 PM
Replies: 8
Views: 229
Posted By cpach

Then a Bb30A to Shimano conversion bb like I...

Then a Bb30A to Shimano conversion bb like I linked. Don't mess around with any kind of converting adapters, they tend to creak.
03-15-21, 11:09 AM
Replies: 8
Views: 229
Posted By cpach

If you already have a Shimano crank installed you...

If you already have a Shimano crank installed you can switch them out, otherwise you'll need a conversion bb like...
03-10-21, 01:56 AM
Replies: 9
Views: 1,063
Posted By cpach

I'd recommend tapping the threads (should be M6)...

I'd recommend tapping the threads (should be M6) and using the longest bolt that fits. While aluminum/magnesium in fork lowers is relatively soft, it's not particularly easy to strip them out. I...
03-10-21, 01:04 AM
Replies: 7
Views: 734
Posted By cpach

If you replace the rear wheel, the hub spacing is...

If you replace the rear wheel, the hub spacing is almost certainly 135mm, and it takes a freewheel. The rim size is 700c, or ERTO 622mm. That should be pretty much all you need. If you want, you can...
03-07-21, 01:10 AM
Replies: 6
Views: 284
Posted By cpach

You miss my point. The bearings in a conversion...

You miss my point. The bearings in a conversion BB are larger than the bearings in a BB386 BB because they accommodate a smaller spindle in the same size bore and will have better longevity and lower...
03-07-21, 01:03 AM
Replies: 4
Views: 288
Posted By cpach

Lower than optimal tensions increase the...

Lower than optimal tensions increase the probability of spoke failure, higher than optimal tension increase the probability of rim failure (at the spoke holes).

You should tension to the highest...
03-05-21, 08:55 PM
Replies: 10
Views: 425
Posted By cpach

You could just swap rings like I suggested.

You could just swap rings like I suggested.
03-05-21, 08:43 PM
Replies: 91
Views: 2,918
Posted By cpach

Congrats, you found your area's actual bike shop....

Congrats, you found your area's actual bike shop.

I would not work somewhere without conmon cutting tools.
03-05-21, 01:24 AM
Replies: 10
Views: 425
Posted By cpach

If the carbon crank has 10 speed rings you can...

If the carbon crank has 10 speed rings you can potentially have some shifting problems with an 11 speed drivetrain. This is technically out of spec though in practice it often works OK. Also, to be...
03-05-21, 01:15 AM
Replies: 6
Views: 284
Posted By cpach

Is it far out enough that the little retention...

Is it far out enough that the little retention tab fits in the spindle? If so it's probably reasonably within spec. The preload bolt shouldn't bottom out on the spindle because it needs room to do...
03-04-21, 11:31 PM
Replies: 91
Views: 2,918
Posted By cpach

I'm a pro mechanic but I never really minded...

I'm a pro mechanic but I never really minded paying for bike work before I started this career when I didn't have the experience or tooling to do something. These days I get annoyed when it's really...
03-02-21, 01:04 AM
Replies: 9
Views: 320
Posted By cpach

Lacing pattern has a minimal effect on the wheel,...

Lacing pattern has a minimal effect on the wheel, to be honest. To reduce stresses on the hub flange it's good to get the spokes nearly tangential. 2x is the convention for a 28h rear wheel and...
03-01-21, 10:34 PM
Replies: 6
Views: 248
Posted By cpach

No, a HTII crankset installed in a conversion...

No, a HTII crankset installed in a conversion BB30 BB should have the same (intended) chainline as if it were installed on a ISO threaded BB. BB30 has a narrow shell width of 68mm, which is the same...
02-28-21, 12:47 AM
Replies: 10
Views: 675
Posted By cpach

Yeah, that generation of Sram front shifting...

Yeah, that generation of Sram front shifting isn't the best. If you switch to better chainrings (Praxis, or Shimano if you can find ones that will fit well) that'll do most of the work to make it...
02-27-21, 11:59 PM
Replies: 5
Views: 294
Posted By cpach

I would recommend not worrying about it too much.

I would recommend not worrying about it too much.
02-27-21, 12:53 AM
Replies: 5
Views: 309
Posted By cpach

Enduro MAX are intended for suspension pivots and...

Enduro MAX are intended for suspension pivots and are not particularly low drag, so I'm not super surprised. Enduro is generally fine if not the absolute tightest tolerance. Also not unlikely to be...
02-27-21, 12:42 AM
Replies: 10
Views: 438
Posted By cpach

First to directly answer your question: Your...

First to directly answer your question:
Your shifters are, to my understanding, blessedly able to shift a triple, and you have a HTII crankset. You'll need a new triple crank, front derailleur, and...
02-23-21, 07:55 PM
Replies: 25
Views: 914
Posted By cpach

Spokes have basically no meaningful effect on...

Spokes have basically no meaningful effect on wheel stiffness beyond the total amount of tension available. Pretty much all spokes have more tensile strength than necessary, so butted spokes will...
02-19-21, 12:40 AM
Replies: 4
Views: 338
Posted By cpach

Discs don't really change target tension. Without...

Discs don't really change target tension. Without any specific information from the manufacturer, targeting 110-120kgf on the side with higher tension (DS on rear, NDS on front) is probably about...
02-17-21, 10:08 PM
Replies: 28
Views: 1,586
Posted By cpach

To be honest what you're going to feel between...

To be honest what you're going to feel between pretty much any 26" mountain bike and pretty much any 27.5/29" wheeled mountain bike is more due to pretty significant changes in geometry in more...
02-17-21, 03:04 AM
Replies: 8
Views: 448
Posted By cpach

Enduro has the best distribution to bike shops in...

Enduro has the best distribution to bike shops in the US and are fine quality. If you're chasing every last watt of efficiency or are obsessed with bearing life there are a few brands that typically...
02-17-21, 03:01 AM
Replies: 11
Views: 536
Posted By cpach

If you're swapping Shimano cranksets you do not...

If you're swapping Shimano cranksets you do not need to change anything about your bottom bracket for reasons of compatibility. If the bottom bracket feels absolutely, entirely fine with the crank...
02-09-21, 03:42 AM
Replies: 7
Views: 288
Posted By cpach

Don't do it. You really want to run a HG+...

Don't do it. You really want to run a HG+ compatible chainring. If you really must get a HG+ compatible ring from Wolftooth to match your existing crank.
02-09-21, 03:38 AM
Replies: 4
Views: 285
Posted By cpach

10 speed chain on 11 speed cassette super doesn't...

10 speed chain on 11 speed cassette super doesn't work--the spacing between cogs is smaller, and thus the chain is thinner. Doing so will skip over cogs.

Road/mountain thing is less cut and dry....
02-06-21, 11:18 PM
Replies: 30
Views: 1,009
Posted By cpach

I'm relatively sold on coil rear shocks for a lot...

I'm relatively sold on coil rear shocks for a lot of trail bikes. Shocks are driven by complex linkages that usually create a progressive leverage rate. On a fork the primary concern is that spring...
02-06-21, 11:09 PM
Replies: 25
Views: 935
Posted By cpach

Honestly I bet it'll work reasonably well in that...

Honestly I bet it'll work reasonably well in that application. As with any cup and cone hub, you can get great mileage at low part cost including use in inclement weather if you're willing to service...
02-06-21, 11:03 PM
Replies: 5
Views: 333
Posted By cpach

Check out your existing wheels--10 speed freehubs...

Check out your existing wheels--10 speed freehubs have a shorter freehub body than 11 speed, so if your bike will accept an 11 speed cassette there should be an 1.8mm spacer behind the cassette, in...
02-03-21, 08:25 PM
Replies: 35
Views: 1,005
Posted By cpach

If you're particularly annoyed by rotor rub I...

If you're particularly annoyed by rotor rub I would again reccommend getting the brake mounts faced, even though it'll cost 30-45 minutes at shop rate per disc to do so.

Discs are also really thin...
Showing results 1 to 50 of 1000
 


 
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