My OCD could use some help (sprocket content)

[Ant]

OK, my XR is a 2016 and I want to put a 42T rear sprocket, the chain will be stock.

So.... what are the differences between these two in the links below and are they a good choice?

Thanks in advance 

https://www.revzilla.com/motorcycle/vortex-525-cat5-aluminum-rear-sprocket-bmw-s1000rr-s1000r-s1000xr

https://www.revzilla.com/motorcycle/vortex-525-f5-aluminum-rear-sprocket-bmw-s1000rr-s1000r-s1000xr

[Deano747]

You will drop the revs for the same speed across all gears which may make it 'bog down' in 1st when you are moving off from a standstill.

 My opinion is that the bike has sufficient torque to handle this - maybe just use a few more revs until you get used to it.

The revs in 6th at 100kph will be ~ 800 less - theoretically giving a higher top speed - but getting it out of the 'buzzy' revs in the cruise.

I am expecting 4,000 - 4,200 rpm at 100KPH.

You may need to take a link out of the chain if there is not enough adjustment available.

I have my 42T sitting in the shed awaiting my chain replacement at the next service.

It was supposed to have been done last year, but an adverse reaction to the Covid Vaccine has kept me off the bikes for the last 11 months.

[Ant]

Originally Posted by Deano747

You will drop the revs for the same speed across all gears which may make it 'bog down' in 1st when you are moving off from a standstill.

 My opinion is that the bike has sufficient torque to handle this - maybe just use a few more revs until you get used to it.

The revs in 6th at 100kph will be ~ 800 less - theoretically giving a higher top speed - but getting it out of the 'buzzy' revs in the cruise.

I am expecting 4,000 - 4,200 rpm at 100KPH.

You may need to take a link out of the chain if there is not enough adjustment available.

I have my 42T sitting in the shed awaiting my chain replacement at the next service.

It was supposed to have been done last year, but an adverse reaction to the Covid Vaccine has kept me off the bikes for the last 11 months.

Any thoughts on the difference between the two sprockets I asked about and posted links of?

[Deano747]

The Cat 5 one is prettier cause it comes in red ......

[MattR]

They're both aluminium so whilst they are relatively light they will each wear like billyoh. The weight saving is not worth it IMO.

Both not for me...   

[Ant]

Originally Posted by MattR

They're both aluminium so whilst they are relatively light they will each wear like billyoh. The weight saving is not worth it IMO.

Both not for me...   

Having a heck of a time finding a 42T in steel, any places you might know of?

[Antares]

there is no 42 pure steels I know of but I think supersprox might do a hybrid one, (steel teeth, alu hub) that said couple people on here having no issues with aluminium longevity.

[Ant]

Originally Posted by Antares

there is no 42 pure steels I know of but I think supersprox might do a hybrid one, (steel teeth, alu hub) that said couple people on here having no issues with aluminium longevity.

Thank you sir

Is there a difference between the CAT5 and the F5 that I should consider? (links above)

[smithy]

Originally Posted by MattR

They're both aluminium so whilst they are relatively light they will each wear like billyoh. The weight saving is not worth it IMO.

Both not for me...   

I've had a 42T aluminium rear sprocket on for over 4 years and 40k km....and it's still ok, no signs of excessive wear at all.

Smithy.

[Antares]

Originally Posted by Ant

Thank you sir

Is there a difference between the CAT5 and the F5 that I should consider? (links above)

They look the same to me with slightly different designs, F5 mentions PTFE coating which would reduce friction therefore better wear but not sure if the CAT5 just forgets to mention it or it doesn't have it, I do remember seeing a horror story a long time ago on a honda forum about vortex sprocket but I think it was an edgecase, sprocket looked similar to the CAT5 though.