tag:blogger.com,1999:blog-5730233429051035621.post6133848241199484025..comments2024-03-12T18:42:09.892+09:00Comments on POSITIVO ESPRESSO: A Hard Lesson in Bike Geometrymobhttp://www.blogger.com/profile/15740078823008165116noreply@blogger.comBlogger9125tag:blogger.com,1999:blog-5730233429051035621.post-1845169791786555022013-01-09T06:05:13.222+09:002013-01-09T06:05:13.222+09:00I have updated the post to reflect my impressions ...I have updated the post to reflect my impressions of the bike handling with the new fork, and a different sized tire.David Litthttps://www.blogger.com/profile/09821846303393230109noreply@blogger.comtag:blogger.com,1999:blog-5730233429051035621.post-56253443127868108722013-01-03T09:49:05.493+09:002013-01-03T09:49:05.493+09:00CM:
TIG welded, not fillet brazed.
Lots and lo...CM:<br /><br />TIG welded, not fillet brazed. <br /><br />Lots and lots of rear tire and/or fender clearance. <br /><br />No cable pull issues with using SRAM Rival (road) brifters with a disk brake.<br /><br />Just search online (or ask Tim Smith at GS Astuto if you are in Tokyo) to get answers to your questions.<br /><br />See also: <br /><br />www.bikeschool.com<br /><br />http://positivo-espresso.blogspot.jp/2012/02/it-is-done.html<br /><br />http://positivo-espresso.blogspot.jp/2012/02/it-is-starting-to-look-like-bicycle.html<br /><br />http://4.bp.blogspot.com/-YMVQzyROTiI/T4v_ipNoUFI/AAAAAAAADec/b1oKV0fgm3A/s1600/IMG_1417.JPG<br />David Litthttps://www.blogger.com/profile/09821846303393230109noreply@blogger.comtag:blogger.com,1999:blog-5730233429051035621.post-61751957967987294402013-01-02T14:57:32.390+09:002013-01-02T14:57:32.390+09:00Did you cut,machine and filet braze, steel I assum...Did you cut,machine and filet braze, steel I assume, all the tubes yourself? I'm impressed.<br /><br />How wide a rear tire do you have clearance for?<br /><br />Is the amount of cable pull different between the disk and V-brake? The SRAM Rival cyclocross levers are designed for either I guess?CMhttps://www.blogger.com/profile/03872518318511716043noreply@blogger.comtag:blogger.com,1999:blog-5730233429051035621.post-23921468328310669412013-01-01T14:34:55.473+09:002013-01-01T14:34:55.473+09:00Hi CM:
The mechanical disk brake is an Avid BB-...Hi CM: <br /><br />The mechanical disk brake is an Avid BB-7. I want to try the disk with a carbon clincher and not need to worry about overheating rims/heat flats, poor braking, seizing etc. on longer descents. Hope it works.<br /><br />I am using a SRAM Rival groupset with their cyclocross crankset (46-36 rings, GXP style BB cups with English-68mm-bottom bracket shell, 172.5mm cranks). There is enough clearance between the rings and the chainstays so that I can use 53-39 rings.<br /><br />When I built the frame, of course, I did a full (1:1) scale drawing and measured all of this when figuring out what size, orientation and placement would work for welding the chainstays to the BB shell. My drawing is sitting in a closet in my mom's house in the U.S., so forgive me if I cannot give you the exact measurements.<br /><br />Doing your own accurate drawing is the only way to get this right, since you won't want make all the same choices as I did. In the worst case you can get someone to help you put a big dimple in your right chainstay ... though I'm glad I did not need to try that.<br />David Litthttps://www.blogger.com/profile/09821846303393230109noreply@blogger.comtag:blogger.com,1999:blog-5730233429051035621.post-53663436362090645862013-01-01T14:15:11.926+09:002013-01-01T14:15:11.926+09:00What size chainrings and what front derailleur do ...What size chainrings and what front derailleur do you have on your Yamabushi? Did the big ring touch the stay at first. Drop or flat bars? How far is the outer chain ring from the center of the seat tube? How wide is the BB shell? <br /><br />I'm trying to build a bike now.CMhttps://www.blogger.com/profile/03872518318511716043noreply@blogger.comtag:blogger.com,1999:blog-5730233429051035621.post-15529566682701070422013-01-01T13:15:17.218+09:002013-01-01T13:15:17.218+09:00I have a mechanical disk brake too, but don't ...I have a mechanical disk brake too, but don't really like it that much. It is noisy, weak and finicky to align the pads and rotor. To get good stopping power it seems the pads have to be rubbing continuously.CMhttps://www.blogger.com/profile/03872518318511716043noreply@blogger.comtag:blogger.com,1999:blog-5730233429051035621.post-46677915499404297322012-12-29T14:39:39.796+09:002012-12-29T14:39:39.796+09:00Yes, a bike with too long a front fork and too muc...Yes, a bike with too long a front fork and too much rake is like Peter Fonda riding a chopper motorcycle in Easy Rider. Very stable at high speed, but devilish to maneuver when going slowly. <br /><br />I ordered via Nashbar another low-end carbon cyclocross fork with disk brake mounts that has less rake and length than the one I got from GS Astuto (Tim has said he will take back the fork I got from him, even though I cut the crown down some when I installed it). David Litthttps://www.blogger.com/profile/09821846303393230109noreply@blogger.comtag:blogger.com,1999:blog-5730233429051035621.post-49292868867282314052012-12-29T06:11:46.464+09:002012-12-29T06:11:46.464+09:00It is no surprise that it will become harder to st...It is no surprise that it will become harder to steer a bike when the rake becomes longer. Think Peter Fonda/Dennis Hopper andn their bikes. The surprise however is, that such small, incremntal changes have such a big impact on the steering. Wow. mobhttps://www.blogger.com/profile/15740078823008165116noreply@blogger.comtag:blogger.com,1999:blog-5730233429051035621.post-81702872782631380602012-12-28T20:36:18.749+09:002012-12-28T20:36:18.749+09:00I am not as experienced, or ambitious, but I have ...I am not as experienced, or ambitious, but I have changed a fork on a road bike and made sure to get as many of the dimensions the same as possible. Worked. Rides great. I can see why you'd run in to trouble though. My fork posts are here, if interested: http://hanlonsrzr.blogspot.jp/search?q=forkἈντισθένηςhttps://www.blogger.com/profile/06199983680204710885noreply@blogger.com