http://citycyclingedinburgh.info/bbpress/ CityCyclingEdinburgh Forum » Topic: Shimano roller brake advice en Sat, 27 Jun 2026 12:57:35 +0000 http://citycyclingedinburgh.info/bbpress/topic.php?id=20446#post-342856 Sun, 27 Dec 2020 21:58:09 +0000 Greenroofer 342856@http://citycyclingedinburgh.info/bbpress/ <p>@crowriver you have PM :-) </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=20446#post-342828 Sun, 27 Dec 2020 15:18:19 +0000 crowriver 342828@http://citycyclingedinburgh.info/bbpress/ <p>In related news (with suitable apologies for thread hijack) I have a Carerra Subway commuter bike with roller brakes and Shimano 8 speed hub gears that I no longer require. I shall be releasing it from my stable in the new year. Frame was slightly small for me, probably a "medium" size, so I fitted a head tube extended gizmo which I need to remove before passing the bike on. Newish Schwalbe Marathon Plus tyres fitted. If anyone might be interested in acquiring this, reply in the thread or PM me. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=20446#post-342735 Thu, 24 Dec 2020 17:53:33 +0000 I were right about that saddle 342735@http://citycyclingedinburgh.info/bbpress/ <p><em>one is a quill stem and the other an aheadset</em></p> <p>Oh, not a problem as long as the head tubes are the same internal diameter which they may well be if they're the same vintage.... </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=20446#post-342729 Thu, 24 Dec 2020 17:00:42 +0000 Greenroofer 342729@http://citycyclingedinburgh.info/bbpress/ <p>Thank you all. I can't use the front fork as is, I don't think, partly because one is a quill stem and the other an aheadset, so I'd end up with the wrong kind of bars. Also my bike is black and Mrs G's is cream, so I just don't think that's going to work.</p> <p>The link chdot referenced is studiously vague about how to install them. It talks about screwing a clamp to the chainstay on the back and doesn't mention the front.</p> <p>It does seem a bit safety-critical to get the front one right, so I think something better than a jubilee clip is called for.</p> <p>I might need to abandon the whole thing. If it turns out that the disc brakes on the commuter bike have indeed failed after a year of no use, I may need to resort to riding the Elephant Bike to work... </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=20446#post-342699 Thu, 24 Dec 2020 11:00:21 +0000 chdot 342699@http://citycyclingedinburgh.info/bbpress/ <p>This seems ambiguous (haven’t read every word). </p> <p>Clear that rear brakes can fitted with a clip if no braze on. </p> <p>Front?</p> <p><a href="https://si.shimano.com/api/publish/storage/pdf/en/dm/HRB001/DM-HRB001-09-ENG.pdf" rel="nofollow">https://si.shimano.com/api/publish/storage/pdf/en/dm/HRB001/DM-HRB001-09-ENG.pdf</a> </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=20446#post-342694 Thu, 24 Dec 2020 09:59:05 +0000 Morningsider 342694@http://citycyclingedinburgh.info/bbpress/ <p>Interesting. Had a quick swatch at the set-up on my Gazelle - the reaction arms are held in place by pretty meaty braze ons. I imagine they might come under quite a bit of stress during braking, so not really something you would want to bodge. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=20446#post-342689 Thu, 24 Dec 2020 09:16:18 +0000 I were right about that saddle 342689@http://citycyclingedinburgh.info/bbpress/ <p>Excellent project.</p> <p>First thought: it may not be physically possible or consistent with the spirit of the thing but could you transplant the entire front fork from the city bike to the commuter?</p> <p>Other than that I think you'll be into light engineering which may not be ideal for safety-critical components? </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=20446#post-342681 Wed, 23 Dec 2020 22:34:29 +0000 Greenroofer 342681@http://citycyclingedinburgh.info/bbpress/ <p>So Mrs G has a rather nice city bike with 7-speed Shimano Nexus hub gears with a roller brake, Shimano dynamo (with a roller brake, and installed by @Harts Cyclery). She doesn't ride it any more, due to the arrival of the e-bike.</p> <p>I have a very tired commuter bike (also hub geared with eccentric bottom bracket) and with hydraulic disc brakes that I expect are now defective after a year of not using the bike. </p> <p>I am minded, partly just because it would be an interesting project, to swap the wheels from Mrs G's bike to mine. I'd need a few cheapish components (new cables and outers, new brake levers, new shifter). The main blocker is the brakes: they need something to hold the reaction arm that makes them work. Mrs G's bike has braze-ons, as does my Elephant Bike. My aim is just to nick the wheels from her bike, rather than plunder it for components...</p> <p>Does anyone have any experience of installing Shimano roller brakes on a bike that doesn't have the fitting (particularly on the front) to constrain the reaction arm (the fitting on the back is a screw-on bracket).</p> <p><a href="https://www.sheldonbrown.com/rollerbrakes.html" rel="nofollow">https://www.sheldonbrown.com/rollerbrakes.html</a> hasn't identified a solution... </p>