Forum Main General BMX Talk What could be the cause of this?

What could be the cause of this?

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trenbologna

Vital BMX member trenbologna 110512 trenbologna /images/default/avatar/c50.png https://www.vitalbmx.com/community/trenbologna,110512/all 02/24/14 2 1

Posts: 3

Joined: 2/24/2014

Location: CAN

2/26/2014 6:34 AM

Hey guys, I am a complete newb to BMX working on my first bike, I bought it used and according to the thread I made here it was a good deal... But I've noticed an issue with the bike and I'm hoping someone can enlighten me, basically sometimes when I stand up on the pedals it sometimes triggers a relatively loud clunking noise... it doesn't happen every time I pedal, only sometimes. It seems to be triggered when I apply pressure on a certain spot.

Thanks for the help...

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adamnmexican

Vital BMX member adamnmexican 105254 adamnmexican https://bmx-media-bucket-photo.s3.amazonaws.com/photos/users/105254/avatar/c50_B01F0308_56A0_4324_961B_8FCC9D15B9CD_1602563978.jpg?1602563564 https://www.vitalbmx.com/community/adamnmexican,105254/all 05/05/13 23 3 https://www.vitalbmx.com/community/adamnmexican,105254/setup 95 4098 22 7

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Location: TX, USA

2/26/2014 7:31 AM

Loose cranks? Take it apart, clean and grease, make sure you have enough spacers. Maybe a bent sprocket? Does your chain get loose, then tight?

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It’s all bmx

Brian_Griffin

Vital BMX member Brian_Griffin 103354 Brian_Griffin https://bmx-media-bucket-photo.s3.amazonaws.com/photos/users/103354/avatar/c50_89d007ae78b555e64029fde9c4d68d49_1476638444.jpg?1476638117 https://www.vitalbmx.com/community/Brian-Griffin,103354/all 02/22/13 2 22 https://www.vitalbmx.com/community/Brian-Griffin,103354/setup 49 740 2 2

Posts: 789

Joined: 2/22/2013

Location: Fredericksburg, VA USA

2/26/2014 7:34 AM

It can be a couple of things?
1. Bottom bracket bearings ( cranks bearings)
2. Take your chain off your front sprocket & spin cranks to see if your sprocket wobble s back & forth. If so it's bent and catching your chain.
3. Check & see if cranks are loose?? It would be a good idea to pull cranks off and inspect bb brarings. If they are good regrease them.
4. Could be you chain. If it's all rusty ( pos) get a new one
5. Pull rear wheel off of bike and inspect axle for being loose ect.
6. Regrease all bearings if you need help there are plenty of how to videos or just hit us back.
Hope this helps

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F¬ Bom 5403692331

handlebar-to-face

Vital BMX member handlebar-to-face 103879 handlebar-to-face https://bmx-media-bucket-photo.s3.amazonaws.com/photos/users/103879/avatar/c50_s_m_gravity_400pix_1370722046.jpg?1370721875 https://www.vitalbmx.com/community/handlebar-to-face,103879/all 03/12/13 1 101 4654 2

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Location: Hawthorne, CA USA

2/26/2014 7:44 AM

Loose cranks probably or bad bearings

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Murica bike check
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dkTechEthan

Vital BMX member dkTechEthan 108982 dkTechEthan https://bmx-media-bucket-photo.s3.amazonaws.com/photos/users/108982/avatar/c50_008efedfd9d48d0c9e18e05903388357_1424155088.jpg?1424155074 https://www.vitalbmx.com/community/dkTechEthan,108982/all 11/20/13 20 1 https://www.vitalbmx.com/community/dkTechEthan,108982/setup 148 1301 9

Posts: 1449

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Location: Manassas, VA USA

2/26/2014 8:19 AM

i've sometimes seen this problem on pos departmentstore mongooses at the cassette

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"The D.O.P.S. System"
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Shortdude

Vital BMX member Shortdude 109649 Shortdude https://bmx-media-bucket-photo.s3.amazonaws.com/photos/users/109649/avatar/c50_IMG_20210608_134000_960_1646199166.jpg?1646198461 https://www.vitalbmx.com/community/Shortdude,109649/all 01/08/14 2 6 https://www.vitalbmx.com/community/Shortdude,109649/setup 58 1290 10 3 7

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2/26/2014 8:23 AM

dkTechEthan wrote:

i've sometimes seen this problem on pos departmentstore mongooses at the cassette

...more

Hey are any of the Walmart cassette hubs reversible?

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bmxfromma

Vital BMX member bmxfromma 80745 bmxfromma https://bmx-media-bucket-photo.s3.amazonaws.com/photos/users/80745/avatar/c50_image_1396922041.jpg?1396921447 https://www.vitalbmx.com/community/bmxfromma,80745/all 06/13/11 102 1703 19 1 3

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2/26/2014 8:23 AM

Is your chain really loose?

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biggybuggy

Vital BMX member biggybuggy 107501 biggybuggy https://bmx-media-bucket-photo.s3.amazonaws.com/photos/users/107501/avatar/c50_2015_08_21_09.27.43_1_1440912113.jpg?1440911743 https://www.vitalbmx.com/community/biggybuggy,107501/all 08/13/13 1 334 4224 1

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2/26/2014 10:31 AM

Had the same problem. Align spindle so the crank arms get same amount of spindle WITH sprocket on. Grease splines, tighten a crapload. And grease all of your threads. All credit to some other member that helped me with this.

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dkTechEthan

Vital BMX member dkTechEthan 108982 dkTechEthan https://bmx-media-bucket-photo.s3.amazonaws.com/photos/users/108982/avatar/c50_008efedfd9d48d0c9e18e05903388357_1424155088.jpg?1424155074 https://www.vitalbmx.com/community/dkTechEthan,108982/all 11/20/13 20 1 https://www.vitalbmx.com/community/dkTechEthan,108982/setup 148 1301 9

Posts: 1449

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Location: Manassas, VA USA

2/26/2014 10:39 AM

dkTechEthan wrote:

i've sometimes seen this problem on pos departmentstore mongooses at the cassette

...more
Shortdude wrote:

Hey are any of the Walmart cassette hubs reversible?

...more

none of the bmx bikes, The only bike I've ever seen at wal-mart that has a reversible hub is the Thruster Fixie, has a cassette on one side, and a fixed on the other side.

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"The D.O.P.S. System"
DK, Odyssey, Profile, Shadow.
check out my bike check
@ethanbrackett
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sundaybmxRR

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2/26/2014 10:57 AM

It's the splines, remove the arms then grease them

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