(Video) What happened to my cassette ? (Loose cogs)
The smallest cog says 'lock' on it, so I believe I have a cassette.
During my last ride, I heard strange noises from the cassette. On certain gears, the cogs have no traction on the hub and me pedaling does not advance the bike. Please view the video below. https://vimeo.com/52736184 Do I need to tighten something that I can see in this image? http://i.imgur.com/TWOH7.jpg |
Only counting 6 cogs there, all cassettes (except some really old Suntour 6 speed) are 7 speed or more now.
Also, there is a big gap (which indicates that this is a cassette, not freewheel) between what looks to be the lock ring, and the first cog, this suggests that a cog (smallest) is missing, and / or a spacer at the rear may be missing as well. |
Originally Posted by jimc101
(Post 14908956)
Only counting 6 cogs there, all cassettes (except some really old Suntour 6 speed) are 7 speed or more now.
Also, there is a big gap (which indicates that this is a cassette, not freewheel) between what looks to be the lock ring, and the first cog, this suggests that a cog (smallest) is missing, and / or a spacer at the rear may be missing as well. |
It's time for a new freewheel.
I'll tell you why I'm pretty sure it's a freewheel. It looks to be a GMC Denali road bike, which has 21 speed gripshifters. Also, as far as I know, no bolt-on cassette wheels are on the market. |
Originally Posted by AlphaDogg
(Post 14909361)
It's time for a new freewheel.
I'll tell you why I'm pretty sure it's a freewheel. It looks to be a GMC Denali road bike, which has 21 speed gripshifters. Also, as far as I know, no bolt-on cassette wheels are on the market. Do I have flexibility for replacing it? I would be happy if I could actually have a larger biggest gear for downhill. The 'specification' that came with the bike say the bike works with a different tooth combination where the largest cog's number is 34T instead of 28T. For tools will I need more than "chain whip" and "lockring spanner"? |
Originally Posted by swmmr1928
(Post 14909894)
Yes it is the GMC Denali.
Do I have flexibility for replacing it? I would be happy if I could actually have a larger biggest gear for downhill. The 'specification' that came with the bike say the bike works with a different tooth combination where the largest cog's number is 34T instead of 28T. For tools will I need more than "chain whip" and "lockring spanner"? |
Is there anything wrong with this freewheel?
It says megadrive. Is that different from megarange? |
Same thing, different brand. Why would you need lower gears to go downhill?
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Originally Posted by ThermionicScott
(Post 14910261)
Same thing, different brand. Why would you need lower gears to go downhill?
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Yes, the freewheel has come apart, probably some pressed on ring on the back broke. The deal with the larger bigger gear is it's different than the front. A big chainring in front is the high gear, but its the small cog in back that is the high gear. So if you wanted a high gear to pedal down hill would want a smaller cog on your freewheel. Unfortunately to find a freewheel with a 13t or 12t cog would probably cost half what you paid for the bike.
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If you want a higher gear then get a freewheel with a 13, I can't remember if a 12 is available, a 14-34 will get you a lower bottom end not a higher gear.
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Originally Posted by onespeedbiker
(Post 14910880)
Unfortunately to find a freewheel with a 13t or 12t cog would probably cost half what you paid for the bike.
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Originally Posted by LesterOfPuppets
(Post 14911076)
Maybe if he got the Denali used. 13-28 HG37 are typically around $20 tops. 13-25 Sunrace for $16
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Originally Posted by onespeedbiker
(Post 14912407)
Unfortunately the 13t freewheels you mention are 7 speed. The current 6 speeds only seem to come in 14T.
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Originally Posted by jimc101
(Post 14908956)
Only counting 6 cogs there, all cassettes (except some really old Suntour 6 speed) are 7 speed or more now.
Also, there is a big gap (which indicates that this is a cassette, not freewheel) between what looks to be the lock ring, and the first cog, this suggests that a cog (smallest) is missing, and / or a spacer at the rear may be missing as well. I suspect a cog broke off and not a spacer. http://sheldonbrown.com/free-k7.html I believe the older shimano Uniglide cassettes were also 6spd. |
Yeah, Denalis come with 7-speed, but typically freewheel on the blue ones, dunno about the yellow ones.
One of the cogs likely cracked in half and fell off. |
1 Attachment(s)
I was going with the six cogs in the photo and the OP's statement
The smallest cog says 'lock' on it .http://bikeforums.net/attachment.php...hmentid=282047 |
Originally Posted by swmmr1928
(Post 14910537)
I want a larger biggest gear. Would this correspond to larger number in the 14-34? My original is 14-28.
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