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Disk brake wheel - repetitive removal / mounting

Old 04-28-20, 02:24 PM
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Redbullet
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Disk brake wheel - repetitive mounting / dismounting

Hi,
I have a question about road bikes with disk brakes (I use rim brakes for the moment): How do disk brakes behave in case of repetitive mounting / dismounting of the front wheel, for transportation inside the car? Do they need special care and adjustments each time, or are they as simple to mount / dismount, as rim brakes?

Thanks
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Old 04-28-20, 07:20 PM
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as long as you are careful there should be no problems. The disc is thin and it can be easily bent if not handled properly.
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Old 04-28-20, 08:24 PM
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Never a problem with the one bike I own with a front disc brake and which must have the front wheel removed to carry the bike on a roof rack.
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Old 04-28-20, 08:35 PM
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This is why you get a frame with thru axles. Lines up the same way every time.
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Old 04-29-20, 04:47 AM
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Just be careful not to pull the brake lever with the wheel out and it will be fine.
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Old 04-29-20, 06:24 AM
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Originally Posted by trailangel View Post
This is why you get a frame with thru axles. Lines up the same way every time.
Thatís been my experience. I have one bike with discs and quick releases, and I think maybe once Iíve been able to reinstall the front wheel without the brake rubbing. Just about every time the wheel comes off, I have to re-align the caliper.

The bike with thru-axles? The caliper lines up with the disc perfectly every time. I donít plan on having another bike with both discs and QRs.
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Old 04-29-20, 11:06 AM
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Originally Posted by ted_major View Post
Thatís been my experience. I have one bike with discs and quick releases, and I think maybe once Iíve been able to reinstall the front wheel without the brake rubbing. Just about every time the wheel comes off, I have to re-align the caliper.

The bike with thru-axles? The caliper lines up with the disc perfectly every time. I donít plan on having another bike with both discs and QRs.
If you flip your bike over when replacing the wheel, try this trick insted:
Hold the bike upright while you thread the disc onto the brake caliper and the axle into the fork ends. Set the bike down until the axle bottoms in the fork ends, tighten the QR and you'll be good to go.
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Old 04-29-20, 11:34 AM
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Originally Posted by dsaul View Post
Just be careful not to pull the brake lever with the wheel out and it will be fine.
Good advice for hydraulic brakes.
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Old 04-29-20, 12:32 PM
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I do lots of one way riding then enjoy lunch with the wife. I remove the front wheel and roll the bike in the back of the mini van. Never an issue with the hyd brakes.
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Old 04-29-20, 12:39 PM
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Originally Posted by Retro Grouch View Post
Set the bike down until the axle bottoms in the fork ends, tighten the QR and you'll be good to go.
I do that, but the caliper still rubs almost every time I reinstall the front wheel. Iíve gone through several sets of calipers, all of which behaved the same way. The bike in question is a 2016 GT Grade, which came w/ TRP HY-RD brakes (and Shimano 105 brifters). I went through a couple of pairs of those under warranty because it was impossible to adjust them so that they wouldnít bottom out on the handlebars. TRP eventually sent me a pair of Spyre calipers, which worked w/o bottoming out, but like the HY-RDs needed re-aligning every time I took the front wheel off. Those were eventually replaced with Yokozuna Motokos, which worked great, but still required caliper re-alignment.

My best guess as to the root cause is that I use Nitto Randonneur bars, which have a traditional round bend instead of modern ergo bars that angle backwards in a straight line. I suspect an ergo bar would leave room for more lever travel, so that I have to adjust the pads close to the disc (which gives me a nice, firm lever feel) and there just isnít any room for even the tiniest misalignment without caliper rub.
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Old 04-29-20, 12:49 PM
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Originally Posted by ted_major View Post
I do that, but the caliper still rubs almost every time I reinstall the front wheel. Iíve gone through several sets of calipers, all of which behaved the same way. The bike in question is a 2016 GT Grade, which came w/ TRP HY-RD brakes (and Shimano 105 brifters). I went through a couple of pairs of those under warranty because it was impossible to adjust them so that they wouldnít bottom out on the handlebars. TRP eventually sent me a pair of Spyre calipers, which worked w/o bottoming out, but like the HY-RDs needed re-aligning every time I took the front wheel off. Those were eventually replaced with Yokozuna Motokos, which worked great, but still required caliper re-alignment.

My best guess as to the root cause is that I use Nitto Randonneur bars, which have a traditional round bend instead of modern ergo bars that angle backwards in a straight line. I suspect an ergo bar would leave room for more lever travel, so that I have to adjust the pads close to the disc (which gives me a nice, firm lever feel) and there just isnít any room for even the tiniest misalignment without caliper rub.
On QRs, the lawyer tabs are to blame. Since one has to turn the skewer a few times to remove and install the wheel, different tensions are placed each time which throw the alignment out of wack. I've had good luck counting revolutions (usually 4 or 5) when removing the wheel and tightening the same amount of revolutions.
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Old 04-29-20, 01:39 PM
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Originally Posted by DorkDisk View Post
I've had good luck counting revolutions (usually 4 or 5) when removing the wheel and tightening the same amount of revolutions.
I do that too (it takes 4 revolutions for this bike). Still canít get the disc & caliper to stay aligned. Mostly I just donít take the wheels off.
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Old 04-29-20, 01:46 PM
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I've never not had to realign the caliper everytime I remove my front wheel for transport. It only takes a second to loosen the caliper, lightly squeeze the brake and retighten, but it's still a pain in the arse.
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Old 04-29-20, 10:23 PM
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Originally Posted by ted_major View Post
Thatís been my experience. I have one bike with discs and quick releases, and I think maybe once Iíve been able to reinstall the front wheel without the brake rubbing. Just about every time the wheel comes off, I have to re-align the caliper.

The bike with thru-axles? The caliper lines up with the disc perfectly every time. I donít plan on having another bike with both discs and QRs.
You can get some DT Swiss RWS skewers which are similar to thru axles. I never had much of a problem with normal QR skewers, maybe reseating the wheel once or twice. But a friend gave me some RWS skewers and I have yet to have a misalignment with them. These skewers are new to me though and I haven't taken the wheel off much since owning them.
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