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 Post subject: Front chainring swapping
PostPosted: Thu Jul 02, 2015 9:15 pm 
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friendly kitty
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Location: Grand Prairie, TX
I am slightly embarrassed to ask this, but I trust HKs won't be too bad about it.

I have never swapped a chain ring. Ever.

I have always just used whatever the bike came with. That said, I am still riding with what it came with (36-22), but I need to change the big ring on my wife's bike because we are doing a gravel ride together, so she will be under geared badly with her 33-22.

When shopping for a chain ring with a 104mm diameter, is there anything special to look for? The bike is a Specialized Rumor Comp with SRAM 1200 series PFBB30 cranks. I only need to swap the big ring and tweak the derailleur.

Of course, this will also help me when I swap my own bike over to a 42-28 in the future. :)


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PostPosted: Thu Jul 02, 2015 9:32 pm 
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bad kitty!
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Is it a single ring or a double?
Single rings are usually wider, and usually double rings has some sort of shift ramps.

Besides that, preferably the new ring should be round, and ideally made of 7075T6


Magura :)

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PostPosted: Fri Jul 03, 2015 1:10 am 
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friendly kitty
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Cool. That's what I thought.

Both are doubles... the 36-22 and 33-22 refer to just the chain ring tooth counts. This will be my wife's first time to do anything like this, so I want to try to make it the best I can. :) Keep her interested in riding with me even if it is just on somewhat paved roads. :)


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PostPosted: Fri Jul 03, 2015 1:07 pm 
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bad kitty!
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Sounds like a plan.

Magura :)

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PostPosted: Fri Jul 03, 2015 5:18 pm 
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pussy
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Make sure to get the right tool for the job, don't try to use a flat head screwdriver on the chainring bolts.


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PostPosted: Fri Jul 03, 2015 6:27 pm 
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friendly kitty
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Sti wrote:
Make sure to get the right tool for the job, don't try to use a flat head screwdriver on the chainring bolts.


Or even better, replace those slotted bolts with double hex bolts. Each side uses a different size, typically 5/6mm. Truvativ makes some like that.

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PostPosted: Fri Jul 03, 2015 6:32 pm 
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friendly kitty
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Lucky for me, the cranks are SRAM and are already double allen head. :)


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PostPosted: Sat Jul 04, 2015 3:00 am 
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yappin' kitty
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southsideguy wrote:
Lucky for me, the cranks are SRAM and are already double allen head. :)

That has save you some headaches, for sure. Other chainrings have a horrible design IMHOP and need a special tool that works poorly.

Make sure you put some blue loctite on those threads before putting the bolts back in there, as well.

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