| View previous topic :: View next topic |
| Author |
Message |
Bob_Jones
Scuffed
Joined: Apr 23, 2007
Posts: 417
|
 Posted: Sat 19th Apr 11:43am Post subject: Slackening Headangle |
  |
|
Ive currently got a DMR switchback built up with a set of 100mm marzocchi mx pros but have been having some issues with the steep head angle.
Since im a tight esra I was wondering if theres an easy/cheap way to slacken the head angle a bit or will I need longer travel forks?
cheers 
|
|
|
| Back to top |
|
 |
H-Dog
Flogged
Joined: Jan 04, 2005
Posts: 2,262
Location: CHCH
|
| Posted: Sat 19th Apr 11:49am Post subject: |
|
|
Longer forks.
Or you could build up a 24 inch rear wheel. This will bring the chainstays down a bit and kick the front out.
|
|
|
| Back to top |
|
|
JohnnyC
Staying Put
Joined: Jan 31, 2003
Posts: 10,868
Location: Christchurch
|
| Posted: Sat 19th Apr 11:50am Post subject: |
|
|
|
There are some "band-aid" ways to slacken a bikes head angle like longer forks or a 24" rear wheel but they don't make it ride as well as a bike that comes with a slacker head angle for the same amount of travel. You can go to a 130mm fork but I don't think a hardtail should have anymore than that
|
|
|
| Back to top |
|
|
KieranC
Worn
Joined: Oct 25, 2006
Posts: 712
Location: waitomo
|
| Posted: Sat 19th Apr 12:06pm Post subject: |
|
|
run tyres bigger then 2.3" at the front and smaller than 2.0" at the rear.
it probably wouldn't make more than a 1/4 of a degree differance though
|
|
|
| Back to top |
|
|
musket
Mangled
Joined: Sep 28, 2002
Posts: 8,581
Location: Transient
|
| Posted: Sat 19th Apr 12:20pm Post subject: |
|
|
|
Cane creek make a headset with a deeper bottom cup.
|
|
|
| Back to top |
|
|
jnumbaz
Flogged
Joined: Aug 24, 2007
Posts: 2,447
Location: Whiter than a Snowman with a Bukkake fatish
|
| Posted: Sat 19th Apr 12:54pm Post subject: |
|
|
|
Super Monster T's(again)
|
|
|
| Back to top |
|
|
Bob_Jones
Scuffed
Joined: Apr 23, 2007
Posts: 417
|
| Posted: Sat 19th Apr 2:15pm Post subject: |
|
|
| JohnnyC wrote: | | There are some "band-aid" ways to slacken a bikes head angle like longer forks or a 24" rear wheel but they don't make it ride as well as a bike that comes with a slacker head angle for the same amount of travel. You can go to a 130mm fork but I don't think a hardtail should have anymore than that |
Ye the thing is that the frame was built around a 120-130mm fork so im just seeing if there is anyway to put anything between the bottom of the steerer and the crown. The headset might be a idea though....
|
|
|
| Back to top |
|
|
danose
Mangled
Joined: May 27, 2004
Posts: 10,603
Location: Nose City
|
| Posted: Sat 19th Apr 2:32pm Post subject: |
|
|
| Bob_Jones wrote: | | JohnnyC wrote: | | There are some "band-aid" ways to slacken a bikes head angle like longer forks or a 24" rear wheel but they don't make it ride as well as a bike that comes with a slacker head angle for the same amount of travel. You can go to a 130mm fork but I don't think a hardtail should have anymore than that |
Ye the thing is that the frame was built around a 120-130mm fork so im just seeing if there is anyway to put anything between the bottom of the steerer and the crown. The headset might be a idea though.... |
the extra deep cup headsets gain your 10mm max - they were mainly designed for certain 'problem' frames where the fork crown would collect the downtube, not as a tuning aid.
best bet is to sell your 100mm forks and buy some 130mm forks. Ideally go for something with travel adjust (then you can have the best of both worlds - something like u-turn pikes or fox32talas would be great on a switchback)
|
|
|
| Back to top |
|
|
musket
Mangled
Joined: Sep 28, 2002
Posts: 8,581
Location: Transient
|
| Posted: Sat 19th Apr 3:44pm Post subject: |
|
|
| danose wrote: | | Bob_Jones wrote: | | JohnnyC wrote: | | There are some "band-aid" ways to slacken a bikes head angle like longer forks or a 24" rear wheel but they don't make it ride as well as a bike that comes with a slacker head angle for the same amount of travel. You can go to a 130mm fork but I don't think a hardtail should have anymore than that |
Ye the thing is that the frame was built around a 120-130mm fork so im just seeing if there is anyway to put anything between the bottom of the steerer and the crown. The headset might be a idea though.... |
the extra deep cup headsets gain your 10mm max - they were mainly designed for certain 'problem' frames where the fork crown would collect the downtube, not as a tuning aid.
best bet is to sell your 100mm forks and buy some 130mm forks. Ideally go for something with travel adjust (then you can have the best of both worlds - something like u-turn pikes or fox32talas would be great on a switchback) |
Not entirely correct Danose. I've seen several Nomads set up with these where buyers wanted to keep 32 RLC's instead of get new 36's. It's not ideal, but it helps.
|
|
|
| Back to top |
|
|
Bob_Jones
Scuffed
Joined: Apr 23, 2007
Posts: 417
|
| Posted: Sat 19th Apr 4:07pm Post subject: |
|
|
| danose wrote: | | Bob_Jones wrote: | | JohnnyC wrote: | | There are some "band-aid" ways to slacken a bikes head angle like longer forks or a 24" rear wheel but they don't make it ride as well as a bike that comes with a slacker head angle for the same amount of travel. You can go to a 130mm fork but I don't think a hardtail should have anymore than that |
Ye the thing is that the frame was built around a 120-130mm fork so im just seeing if there is anyway to put anything between the bottom of the steerer and the crown. The headset might be a idea though.... |
the extra deep cup headsets gain your 10mm max - they were mainly designed for certain 'problem' frames where the fork crown would collect the downtube, not as a tuning aid.
best bet is to sell your 100mm forks and buy some 130mm forks. Ideally go for something with travel adjust (then you can have the best of both worlds - something like u-turn pikes or fox32talas would be great on a switchback) |
Ye Id love to be able to simply get another pair of forks but due to limited funds its just not going to happen anytime soon... guess ill just have to start saving
cheers anyway
|
|
|
| Back to top |
|
|
danose
Mangled
Joined: May 27, 2004
Posts: 10,603
Location: Nose City
|
| Posted: Sat 19th Apr 4:07pm Post subject: |
|
|
| musket wrote: | | Not entirely correct Danose. I've seen several Nomads set up with these where buyers wanted to keep 32 RLC's instead of get new 36's. It's not ideal, but it helps. |
as a bandaid - functional, but 1cm is not even a 1/2 degree change, so only just. Having been in that very situation with the reign (originally built it up with 505mm a2c van130s - 15mm shorter than spec) I could have probably gone down that road, but fitting a correct sized fork was so much more appealing 
|
|
|
| Back to top |
|
|
musket
Mangled
Joined: Sep 28, 2002
Posts: 8,581
Location: Transient
|
| Posted: Sat 19th Apr 4:09pm Post subject: |
|
|
Except here Bob has stated pretty clearly that he doesn't want to do that.
The difference between a 70* head angle and 69.5* is actually effective.
|
|
|
| Back to top |
|
|
Oli
Mangled
Joined: Aug 03, 2005
Posts: 31,908
|
| Posted: Sat 19th Apr 4:11pm Post subject: |
|
|
|
Not so much with a suspension fork though. You really need at least a full degree to feel the benefit of a geometry change...
|
|
|
| Back to top |
|
|
danose
Mangled
Joined: May 27, 2004
Posts: 10,603
Location: Nose City
|
| Posted: Sat 19th Apr 4:15pm Post subject: |
|
|
| Bob_Jones wrote: | | Ye Id love to be able to simply get another pair of forks but due to limited funds its just not going to happen anytime soon... guess ill just have to start saving |
MX Pros used to come in 120mm as well as 100mm - would be worth finding someone who knows the insides of marzocchis to see if they're convertible travel?
|
|
|
| Back to top |
|
|
danose
Mangled
Joined: May 27, 2004
Posts: 10,603
Location: Nose City
|
| Posted: Sat 19th Apr 4:20pm Post subject: |
|
|
| danose wrote: | | Bob_Jones wrote: | | Ye Id love to be able to simply get another pair of forks but due to limited funds its just not going to happen anytime soon... guess ill just have to start saving |
MX Pros used to come in 120mm as well as 100mm - would be worth finding someone who knows the insides of marzocchis to see if they're convertible travel? |
just checked - the 05/06 mxpro is actually 105mm travel, and relatively tall for it's travel (483mm - compared to 472mm for a 100mm fox). So things aren't quite as bad as they seem. The 120mm mxpro is actually nearly as tall as a 130mm fox!!!
|
|
|
| Back to top |
|
|
|
