http://citycyclingedinburgh.info/bbpress/ CityCyclingEdinburgh Forum » Topic: Forks en Wed, 13 May 2026 04:55:39 +0000 http://citycyclingedinburgh.info/bbpress/topic.php?id=10917#post-122338 Tue, 20 Aug 2013 08:04:27 +0000 amir 122338@http://citycyclingedinburgh.info/bbpress/ <p>In the end I kept the 45mm forks and tried them out at the weekend. The combination of the new forks and wheel seemed to make the handling around downhill curves better than I remember - more secure and precise.</p> <p>The additional good news is that CRC gave me a voucher for sending me the wrong size. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=10917#post-122004 Thu, 15 Aug 2013 21:46:42 +0000 chdot 122004@http://citycyclingedinburgh.info/bbpress/ <p>"It's somat to do with geometry, init."</p> <p>Yep, all here -</p> <p><a href="http://citycyclingedinburgh.info/bbpress/topic.php?id=10915" rel="nofollow">http://citycyclingedinburgh.info/bbpress/topic.php?id=10915</a> </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=10917#post-122002 Thu, 15 Aug 2013 21:39:01 +0000 amir 122002@http://citycyclingedinburgh.info/bbpress/ <p>It's somat to do with geometry, init. Don't forget that the bike leans on turning. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=10917#post-121973 Thu, 15 Aug 2013 18:32:44 +0000 Uberuce 121973@http://citycyclingedinburgh.info/bbpress/ <p>I don't understand how there can be a difference in precision; even including front suspension the fork/handlebar/tyre unit is effectively rigid with respect to rotational motion, isn't it? </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=10917#post-121935 Thu, 15 Aug 2013 14:37:58 +0000 amir 121935@http://citycyclingedinburgh.info/bbpress/ <p>@cyclingmollie</p> <p>trail tables are <a href="http://bikeraceinfo.com/tech/trail.html">here</a></p> <p>According to these, my setup with 73 degs and 43 mm rake gives 5.9 trail whereas 45mm rake gives 5.69.</p> <p>Your setup of 72 degs and 45 rake gives 6.31</p> <p>In the <a href="http://www.dclxvi.org/chunk/tech/trail/">linked article</a>, it says that</p> <p>"a more stable bike will help the rider stay upright, but cannot be steered with as much precision"</p> <p>Somewhere else it says that a trail between 5.5 and 6.0 is "neutral" however that is defined.</p> <p>Anyway the shop is not acting quickly on having sent the wrong rake and given little diff between 43 and 45, I might just risk it. Pity you can't test forks before you buy!</p> <p>"a more stable bike will help the rider stay upright, but cannot be steered with as much precision" </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=10917#post-121901 Thu, 15 Aug 2013 12:26:32 +0000 amir 121901@http://citycyclingedinburgh.info/bbpress/ <p>I also posted this on the CTC forum. The advice is that I am unlikely to notice 2mm difference. 45mm also seems to be approximately neutral with an hta of 73 degs according to some tables I found on t'web. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=10917#post-121811 Wed, 14 Aug 2013 13:38:29 +0000 Cyclingmollie 121811@http://citycyclingedinburgh.info/bbpress/ <p>There's a good article on <a href="http://davesbikeblog.squarespace.com/blog/2007/5/4/trail-fork-rake-and-a-little-bit-of-history.html">Dave Moulton's blog</a>. Elsewhere he states:<br /> "... fork rake (Offset) ... seems to have increased in recent years to around 45mm. A shorter rake, as much as a centimeter, bringing it down to 35mm would increase the amount of trail and would make the bike more stable, and hold a tighter line when cornering."</p> <p>Edit: I had a frame/fork combo on my old winter frame which never felt right. It was slow to corner giving a feeling that I was falling over as I went round corners. I think it was a 73 degree head tube with a 43mm fork rake. My current summer bike has a 72 degree head tube and 45mm rake as far as I can remember and feels much better to me. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=10917#post-121804 Wed, 14 Aug 2013 13:22:36 +0000 amir 121804@http://citycyclingedinburgh.info/bbpress/ <p>A tricky question this one:</p> <p>I am buying new forks for my weekend bike after the crash. The old had 43mm rake - the frame has a 73 degree head angle. I ordered a new fork with a 43 mm rake to be consistent but one with 45mm has been sent to me.</p> <p>My Q is - might this be a good thing? It should make the steering a mite more responsive - would this help on the descents as I can be a nervous descender esp around corners. I am more confident on my other bike, a Ridgeback Horizon - don't know the geometry for this. </p>