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How can I check whether a fork is bent

What is the problem with my suspension fork?Rigid fork replacement for Rock Shox Bluto fat bike suspension fork?Having the fork blades alignedHow to calculate rigid fork replacement for suspension one?Hitting bumps on a locked out suspension forkCan this bent (after crash) rigid steel fork get repaired?Bike unstable (difficult to ride without hands on bars) after changing fork after collisionBroken fork and front wheel after head-on crash, need to replace headset?Fork is noisy sounds like metal parts are looseFrame failure sudden death?

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3

In the case of a crash hard enough to buckle a strong front wheel, how should the fork alignment be checked. The bike is a steel tourer and pretty tough.

fork crash

share|improve this question

asked 8 hours ago

Chris HChris H

26.5k11 gold badge4141 silver badges120120 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  We've got related questions about what to do if it is bent, but searching didn't come up with anything for this.
  
  – Chris H
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Bent in the direction of travel or laterally? (It's not clear to me which way the force of the crash went.)
  
  – DavidW
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @DavidW either/both. I was there and it's not clear to me either.
  
  – Chris H
  7 hours ago
  

  
  
  
  

add a comment | 

3

In the case of a crash hard enough to buckle a strong front wheel, how should the fork alignment be checked. The bike is a steel tourer and pretty tough.

fork crash

share|improve this question

asked 8 hours ago

Chris HChris H

26.5k11 gold badge4141 silver badges120120 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  We've got related questions about what to do if it is bent, but searching didn't come up with anything for this.
  
  – Chris H
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Bent in the direction of travel or laterally? (It's not clear to me which way the force of the crash went.)
  
  – DavidW
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @DavidW either/both. I was there and it's not clear to me either.
  
  – Chris H
  7 hours ago
  

  
  
  
  

add a comment | 

In the case of a crash hard enough to buckle a strong front wheel, how should the fork alignment be checked. The bike is a steel tourer and pretty tough.

fork crash

share|improve this question

asked 8 hours ago

Chris HChris H

26.5k11 gold badge4141 silver badges120120 bronze badges

share|improve this question

asked 8 hours ago

Chris HChris H

26.5k11 gold badge4141 silver badges120120 bronze badges

share|improve this question

asked 8 hours ago

Chris HChris H

26.5k11 gold badge4141 silver badges120120 bronze badges

asked 8 hours ago

Chris HChris H

26.5k11 gold badge4141 silver badges120120 bronze badges

asked 8 hours ago

Chris HChris H

26.5k11 gold badge4141 silver badges120120 bronze badges

2 Answers
2

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1

Not having fancy tools, I would check for a bend in the direction of travel by measuring the wheelbase of the bike and comparing it to the original specs. This would work for me, because I've never changed the forks on any bike I've owned, but it may not work for you.

Similarly, not having fancy tools, I would check for lateral bending by putting the bike on a stand, using a plumb line to make sure the down tube is vertical, and then using the line from the centre of the stem to check that it is centred between the front dropouts.

share|improve this answer

answered 8 hours ago

DavidWDavidW

29211 silver badge99 bronze badges

add a comment | 

1

I think the two mis-alignment 'modes' you need to check for are:

• Both fork legs pushed back, so that rake is reduced


• Twist between the fork crown and axle axis between the dropouts

To determine if rake is reduced, you'd have to know what it was pre-crash, obviously. If you can take the fork out of the bike measurement is easy - see image below. With the fork in the bike you could set the bike up in a repair stand with the steerer perfectly vertical, them drop plumb lines onto the floor and measure the distance between the lines.

To check for twist, just put two straight edges on the fork, one at the crown, one in the dropouts. Look down the axis of the steerer and check if the edges are parallel.

share|improve this answer

answered 5 hours ago

Argenti ApparatusArgenti Apparatus

41.9k33 gold badges4545 silver badges104104 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I've got quite a lot of geometry details so may well have the rake or be able to calculate it. It's a bit hypothetical now as I don't be able to mend it until I'm mended - but I won't need it until then either.
  
  – Chris H
  2 hours ago
  
  

  
  
  
  

add a comment | 

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1

Not having fancy tools, I would check for a bend in the direction of travel by measuring the wheelbase of the bike and comparing it to the original specs. This would work for me, because I've never changed the forks on any bike I've owned, but it may not work for you.

Similarly, not having fancy tools, I would check for lateral bending by putting the bike on a stand, using a plumb line to make sure the down tube is vertical, and then using the line from the centre of the stem to check that it is centred between the front dropouts.

share|improve this answer

answered 8 hours ago

DavidWDavidW

29211 silver badge99 bronze badges

add a comment | 

1

Not having fancy tools, I would check for a bend in the direction of travel by measuring the wheelbase of the bike and comparing it to the original specs. This would work for me, because I've never changed the forks on any bike I've owned, but it may not work for you.

Similarly, not having fancy tools, I would check for lateral bending by putting the bike on a stand, using a plumb line to make sure the down tube is vertical, and then using the line from the centre of the stem to check that it is centred between the front dropouts.

share|improve this answer

answered 8 hours ago

DavidWDavidW

29211 silver badge99 bronze badges

add a comment | 

Not having fancy tools, I would check for a bend in the direction of travel by measuring the wheelbase of the bike and comparing it to the original specs. This would work for me, because I've never changed the forks on any bike I've owned, but it may not work for you.

Similarly, not having fancy tools, I would check for lateral bending by putting the bike on a stand, using a plumb line to make sure the down tube is vertical, and then using the line from the centre of the stem to check that it is centred between the front dropouts.

share|improve this answer

answered 8 hours ago

DavidWDavidW

29211 silver badge99 bronze badges

share|improve this answer

answered 8 hours ago

DavidWDavidW

29211 silver badge99 bronze badges

answered 8 hours ago

DavidWDavidW

29211 silver badge99 bronze badges

answered 8 hours ago

DavidWDavidW

29211 silver badge99 bronze badges

1

I think the two mis-alignment 'modes' you need to check for are:

• Both fork legs pushed back, so that rake is reduced


• Twist between the fork crown and axle axis between the dropouts

To determine if rake is reduced, you'd have to know what it was pre-crash, obviously. If you can take the fork out of the bike measurement is easy - see image below. With the fork in the bike you could set the bike up in a repair stand with the steerer perfectly vertical, them drop plumb lines onto the floor and measure the distance between the lines.

To check for twist, just put two straight edges on the fork, one at the crown, one in the dropouts. Look down the axis of the steerer and check if the edges are parallel.

share|improve this answer

answered 5 hours ago

Argenti ApparatusArgenti Apparatus

41.9k33 gold badges4545 silver badges104104 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I've got quite a lot of geometry details so may well have the rake or be able to calculate it. It's a bit hypothetical now as I don't be able to mend it until I'm mended - but I won't need it until then either.
  
  – Chris H
  2 hours ago
  
  

  
  
  
  

add a comment | 

1

I think the two mis-alignment 'modes' you need to check for are:

• Both fork legs pushed back, so that rake is reduced


• Twist between the fork crown and axle axis between the dropouts

To determine if rake is reduced, you'd have to know what it was pre-crash, obviously. If you can take the fork out of the bike measurement is easy - see image below. With the fork in the bike you could set the bike up in a repair stand with the steerer perfectly vertical, them drop plumb lines onto the floor and measure the distance between the lines.

To check for twist, just put two straight edges on the fork, one at the crown, one in the dropouts. Look down the axis of the steerer and check if the edges are parallel.

share|improve this answer

answered 5 hours ago

Argenti ApparatusArgenti Apparatus

41.9k33 gold badges4545 silver badges104104 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I've got quite a lot of geometry details so may well have the rake or be able to calculate it. It's a bit hypothetical now as I don't be able to mend it until I'm mended - but I won't need it until then either.
  
  – Chris H
  2 hours ago
  
  

  
  
  
  

add a comment | 

I think the two mis-alignment 'modes' you need to check for are:

• Both fork legs pushed back, so that rake is reduced


• Twist between the fork crown and axle axis between the dropouts

To determine if rake is reduced, you'd have to know what it was pre-crash, obviously. If you can take the fork out of the bike measurement is easy - see image below. With the fork in the bike you could set the bike up in a repair stand with the steerer perfectly vertical, them drop plumb lines onto the floor and measure the distance between the lines.

To check for twist, just put two straight edges on the fork, one at the crown, one in the dropouts. Look down the axis of the steerer and check if the edges are parallel.

share|improve this answer

answered 5 hours ago

Argenti ApparatusArgenti Apparatus

41.9k33 gold badges4545 silver badges104104 bronze badges

share|improve this answer

answered 5 hours ago

Argenti ApparatusArgenti Apparatus

41.9k33 gold badges4545 silver badges104104 bronze badges

answered 5 hours ago

Argenti ApparatusArgenti Apparatus

41.9k33 gold badges4545 silver badges104104 bronze badges

answered 5 hours ago

Argenti ApparatusArgenti Apparatus

41.9k33 gold badges4545 silver badges104104 bronze badges