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I’ll do a larger rear sprocket when I need a new chain, but already have much better 6th gear pull on the highway, and better power down low.
I did the 16/39 swap in one sitting. Kind of wish I’d done the front then the rear to see the difference but I love the new gearing.
 

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Between kid and work, my 16 tooth Thruxton sprocket has been on a shelf for a few months, until today.

The bike looks mean with the sprocket cover off, and I wish there was a simple kit to relocate the coolant.

Instantly, love it. This is another one if those mods that feels like it should have come this way. I’ll do a larger rear sprocket when I need a new chain, but already have much better 6th gear pull on the highway, and better power down low.
Great to hear, I started changing mine last night ? Can't wait!
 

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Just ordered the 16T sprocket. Wanted to change the front first and see the results before doing the rear sprocket. From a 2.17 to a 2.31 ratio I think it will be a big difference already.
 

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After reading through this a Thruxton 16T and ZF 39T Sprockets are on the shopping list. I'll be interested to see how much of a difference it makes! ?
 

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After reading through this a Thruxton 16T and ZF 39T Sprockets are on the shopping list. I'll be interested to see how much of a difference it makes! ?
I did the 40t rear sprocket on my old Bobber and it was a big improvement.

I pick up my new Speedmaster on Sunday (weather permittin) so I’ve pre ordered a new 40t and a 16t to fit after the first service..

This is a good place to buy sprockets from??

 

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I did the 40t rear sprocket on my old Bobber and it was a big improvement.

I pick up my new Speedmaster on Sunday (weather permittin) so I’ve pre ordered a new 40t and a 16t to fit after the first service..

This is a good place to buy sprockets from??

Cool , thank you. I'll give it a look .I've ordered from them before and have nothing but praise. I'll be keeping my fingers crossed for you regarding the weather and hope the new Speedmaster treats you well. ?
 
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To the people running 16/39 or 16/40 gearing, what is your rpm now at say 100 km/h ?
thanks in advance
 

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16/39 here as well , I've not noticed any under or over gearing for the type of riding I do. All I know is that it pulls much harder in every gear and to my mind it should of left the factory like it. 👌👍
 
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Just ordered my 16T TTR sprocket for the front, can anyone recommend a 39t rear sprocket? Also should it be a 520 or 525, sorry if this is a stupid question, im still learning.
 

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Discussion Starter #114
I ordered my 39t from SuperSprox:


All the sprockets are 525.
 

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I ordered my 39t from SuperSprox:


All the sprockets are 525.
Thank you
 

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I've been hunting for a supersprox RFE-2012-39-BLK now all week and have had no luck, anyone have a lead on where I might find one, happy for it to be shipped to UK or Canada.
 

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A&J cycles has their version of the 39T rear sprocket. I sent Brian an email over the summer when I couldn’t find one anywhere, and he had a whole batch of them made.

16/39 is how I feel the bike should have come.
 

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Thank you, if I don't find a black one soon then this seems to be a good option.
 
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