going from 45mm to 38mm rake
#2
Senior Member
Join Date: Mar 2007
Location: Rohnert Park, CA
Posts: 1,248
Bikes: Pake track, Soma DoubleCross, LeMond Etape, Maruishi RoadAce 303
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
The frame geometry doesn't change because of rack. The frame geometry changes because of axle to crown length.
#3
Brake chatter on CX forks
Join Date: Aug 2004
Location: Toronto, ON
Posts: 106
Bikes: '04 Kona Jake, '05 Kona Stuff, '07 Specialized Langster
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
It will increase the trail, in the steering geometry, of your bike. Your bike will be more stable, and less twitchy/responsive.
https://sheldonbrown.com/gloss_tp-z.html#trail
https://www.phred.org/~josh/bike/trail.html
https://sheldonbrown.com/gloss_tp-z.html#trail
https://www.phred.org/~josh/bike/trail.html
#5
partly metal, partly real
Join Date: Aug 2005
Location: Philadelphia.
Posts: 3,597
Bikes: Hummer H2
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
#6
Senior Member
Join Date: Mar 2007
Location: Rohnert Park, CA
Posts: 1,248
Bikes: Pake track, Soma DoubleCross, LeMond Etape, Maruishi RoadAce 303
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Because that was the only other non-answered question. The OP asked how much a 45mm-38mm = 7mm change in the rake would affect the geometry. You should be asking the OP why they would ask a question to which they already knew the answer if the question was, in fact, about the fork geometry.
#7
Ths Hipstr Kills Masheenz
Join Date: Oct 2006
Location: seattle
Posts: 8,542
Bikes: tirove
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 3 Times
in
3 Posts
use your words...
if you mean handling, it will make it turn easier and twitch more, as well as fall over easier at speed. that is if the wheel clears.
#8
Live without dead time
Join Date: Jun 2008
Location: Toronto
Posts: 2,136
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
#10
partly metal, partly real
Join Date: Aug 2005
Location: Philadelphia.
Posts: 3,597
Bikes: Hummer H2
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Because that was the only other non-answered question. The OP asked how much a 45mm-38mm = 7mm change in the rake would affect the geometry. You should be asking the OP why they would ask a question to which they already knew the answer if the question was, in fact, about the fork geometry.
hell, bringing up stems would've made more sense...
#12
.
Join Date: Sep 2006
Posts: 3,860
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Depending on the fork design, it can slightly change the head tube and seat tube angles, as well as the bottom bracket height. Depends on the axle to crown length and the offset.
The differences are probably negligable though.
The differences are probably negligable though.
__________________
https://blicksbags.com/
https://blicksbags.com/
#13
Senior Member
Join Date: Mar 2007
Location: Rohnert Park, CA
Posts: 1,248
Bikes: Pake track, Soma DoubleCross, LeMond Etape, Maruishi RoadAce 303
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
#14
Senior Member
Join Date: Mar 2007
Location: Rohnert Park, CA
Posts: 1,248
Bikes: Pake track, Soma DoubleCross, LeMond Etape, Maruishi RoadAce 303
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
careful, sp00ki has declared this area off-limits. watch yourself.
#15
Senior Member
Join Date: Aug 2005
Location: ontario
Posts: 2,234
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
I put a fork on before with about 38mm rake and my only complaint was the mega toe over lap, not that it will affect your normal riding, but if you're pulling up at a stop light and wanna attempt to do any kind of track standing you may find yourself trying to turn your bars and finding your front wheel hitting your foot, im not great at track standing and always find myself turning the bars back and fourth to maintain balance so it always pissed me off. Other than that I loved the handling with the 38 fork!
#16
aka mattio
https://www.anvilbikes.com/images/1064634020.xls
That link will let you calculate your bike's trail.
https://www.urbanvelo.org/issue3/urbanvelo3_p44-45.html
That link will teach you a little bit about trail and different handling characteristics.
I find that a lower-rake fork on a bike that's not meant for it offers really undesirable handling. So, while this doesn't answer your question, I hope it provides some helpful information.
That link will let you calculate your bike's trail.
https://www.urbanvelo.org/issue3/urbanvelo3_p44-45.html
That link will teach you a little bit about trail and different handling characteristics.
I find that a lower-rake fork on a bike that's not meant for it offers really undesirable handling. So, while this doesn't answer your question, I hope it provides some helpful information.
#17
helmet brake
Join Date: May 2008
Location: Brooklyn
Posts: 624
Bikes: Kilo TT
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts