TBR7 - Smallest rear sprocket you tried?

CheapThrills · 04-03-2021, 01:37 PM

I have the 17 tooth sprocket in the front, and liked the results. Now looking at my TBR7 and looks like a 46 tooth rear sprocket? Now wondering what if I should down size that, and if anyone has advice. What size did you go with and what were the results?

Thank you

Bacchus · 04-04-2021, 09:02 AM

I tried a 13/32 setup and wasn’t happy with it. I’m now running a 12/32 and love it.

toneloc6530 · 04-04-2021, 09:13 AM

Seems like 17/42 is about as low as you can go

gwowzer · 04-04-2021, 11:47 AM

I am running a 17/43 combo on the Brozz and it works well. Not a big loss of torque and it keeps the revs down for street riding. If you do more off-road, I would keep it the way you have it. 17/46 is what the Brozz comes stock with.

Bill Hilly · 04-04-2021, 10:48 PM

I now have a 42 / 17 combo on my Brozz, but I have also ran the 42 with a 15 tooth which I found for less than $10 bucks from eBay. I think I may favor the 15/42 over the 17/42 . It was actually just a hair lower at about a 2.80 -1 over the factory 46/17 set which is about 2.70-1 . I think the 17/42 (2.47-1) is just too high for my weight. I feel like I have to almost slip the clutch, and drag my feet taking off from a dead stop on even a slight slope. The 17/42 is about 10,or 12 percent higher geared, so it's like taking away 1.5, or 1.75 horse power from a 15 horse motor. I like the 10-12 percent reduction in rpm at 55, which is the fastest I actually need to go, and I have no need what so ever for the bike to ever run 70. I hate to keep buying sprockets, but I think I may get a 16. I actually should have just left the factory sprocket on it, but I got curious. My bike doesn't seem to mind the RPMs, and ,in fact ,it handles them so well that I am sometimes surprised to see how high my tachometer is reading , but I don't want to press my luck on it either.

gwowzer · 04-04-2021, 11:07 PM

Has anyone changed the factory Brozz sprockets to a lower gearing? Just curious what the results were. it would be neat to change the front down if needed for a weekend or something. where would a 15/43 put me? Anyone done it?

Bill Hilly · 04-04-2021, 11:25 PM

Quote:

Originally Posted by gwowzer

Has anyone changed the factory Brozz sprockets to a lower gearing? Just curious what the results were. it would be neat to change the front down if needed for a weekend or something. where would a 15/43 put me? Anyone done it?

It would put you at 2.87-1 over the stock ratio of 2.70, a 6% difference. I was real close to the same ratio with my 42, and 15. I actually liked it. You would run 5,300 rpm in the same gear, and at the same speed that you would run 5,000 at with stock sprockets.

JerseyTBR7 · 04-05-2021, 09:58 AM

Bacchus, I still have my 13/32 with the 520 chain on there. How does the top end speed and rpms look with the 12 front?

Right now, I will likely change my pilot jet up a bit to likely a27.5 or 30 on my minkuni vm26 for startup and idle tuning. I think it came with a 25.

Bacchus · 04-05-2021, 10:45 AM

My speedometer quit and I have no tachometer. I’m looking for an easy to install cluster if you know of one. But before the speedometer quit I was hitting 65 easily. With the 13/32 setup 5th gear was hard for me to reach just cruising the back roads. And when I did I had trouble keeping speed and definitely not gaining any speed after the shift to 5th. But the 12/32 makes 5th gear usable for me.

JerseyTBR7 · 04-05-2021, 01:19 PM

I was looking for a plug-in simple speedo too, no luck. If mine happens to fail, likely I would just go with another original to keep it simple otherwise. You can always use the Waze app with GPS speedo in the meantime. If you happen to find one, please us know and post it.

alex_in_az · 04-05-2021, 01:32 PM

I have 17/40 and it'll run at 70mph all day at just over 7k rpm. I'd thought about dropping back to 15/40, because I miss being able to rolling throttle wheelie in 1st

Bacchus · 04-06-2021, 03:44 PM

Okay I hit 71.5 mph today and if it weren’t so windy there was more there. I don’t know how much more but the engine wasn’t screaming. I’m 6’2” and about 165 lbs.

buzz · 04-14-2021, 01:39 AM

17 and 39 works great for me,can run 55 with out beating my tbr7. 200 miles and no problems, just sprockets and a chain.

CheapThrills · 05-14-2021, 09:26 AM

So, if I go 17/40, I can have a higher mph, without much loss on the low end?

JerseyTBR7 · 05-14-2021, 01:45 PM

13/32 with 520 100 link chain on it now.

Going to adjust to 13/33 whenever I next have to remove the back wheel for any reason.

04-03-2021, 01:37 PM	#1
CheapThrills Join Date: Jan 2021 Location: Lehigh Valley Area Posts: 148	TBR7 - Smallest rear sprocket you tried? I have the 17 tooth sprocket in the front, and liked the results. Now looking at my TBR7 and looks like a 46 tooth rear sprocket? Now wondering what if I should down size that, and if anyone has advice. What size did you go with and what were the results? Thank you __________________ - My 2 Bikes: TaoTao TBR7 Boom Vader Gen 2 (BD125-10) Testing a YouTube Channel
	0

04-05-2021, 01:32 PM	#11
alex_in_az Join Date: Aug 2013 Location: Goodyear, Arizona Posts: 407	I have 17/40 and it'll run at 70mph all day at just over 7k rpm. I'd thought about dropping back to 15/40, because I miss being able to rolling throttle wheelie in 1st __________________ 2020 Tao TBR7 9.3:1 PnP head CRF230F exhaust 4 degree advance key 290 degree cam Nibbi PE30 and cone filter Front fork brace
	2

05-14-2021, 09:26 AM	#14
CheapThrills Join Date: Jan 2021 Location: Lehigh Valley Area Posts: 148	So, if I go 17/40, I can have a higher mph, without much loss on the low end? __________________ - My 2 Bikes: TaoTao TBR7 Boom Vader Gen 2 (BD125-10) Testing a YouTube Channel
	0

04-04-2021, 09:02 AM	#2
Bacchus Join Date: Oct 2020 Posts: 62	I tried a 13/32 setup and wasn’t happy with it. I’m now running a 12/32 and love it.
	0

04-04-2021, 09:13 AM	#3
toneloc6530 Join Date: Apr 2015 Posts: 36	Seems like 17/42 is about as low as you can go
	0

04-04-2021, 11:47 AM	#4
gwowzer Join Date: Aug 2019 Location: Central Ohio Posts: 297	I am running a 17/43 combo on the Brozz and it works well. Not a big loss of torque and it keeps the revs down for street riding. If you do more off-road, I would keep it the way you have it. 17/46 is what the Brozz comes stock with.
	1

04-04-2021, 10:48 PM	#5
Bill Hilly Join Date: Feb 2021 Posts: 947	I now have a 42 / 17 combo on my Brozz, but I have also ran the 42 with a 15 tooth which I found for less than $10 bucks from eBay. I think I may favor the 15/42 over the 17/42 . It was actually just a hair lower at about a 2.80 -1 over the factory 46/17 set which is about 2.70-1 . I think the 17/42 (2.47-1) is just too high for my weight. I feel like I have to almost slip the clutch, and drag my feet taking off from a dead stop on even a slight slope. The 17/42 is about 10,or 12 percent higher geared, so it's like taking away 1.5, or 1.75 horse power from a 15 horse motor. I like the 10-12 percent reduction in rpm at 55, which is the fastest I actually need to go, and I have no need what so ever for the bike to ever run 70. I hate to keep buying sprockets, but I think I may get a 16. I actually should have just left the factory sprocket on it, but I got curious. My bike doesn't seem to mind the RPMs, and ,in fact ,it handles them so well that I am sometimes surprised to see how high my tachometer is reading , but I don't want to press my luck on it either.
	0

04-04-2021, 11:07 PM	#6
gwowzer Join Date: Aug 2019 Location: Central Ohio Posts: 297	Has anyone changed the factory Brozz sprockets to a lower gearing? Just curious what the results were. it would be neat to change the front down if needed for a weekend or something. where would a 15/43 put me? Anyone done it?
	1

04-05-2021, 09:58 AM	#8
JerseyTBR7 Join Date: Oct 2020 Posts: 130	Bacchus, I still have my 13/32 with the 520 chain on there. How does the top end speed and rpms look with the 12 front? Right now, I will likely change my pilot jet up a bit to likely a27.5 or 30 on my minkuni vm26 for startup and idle tuning. I think it came with a 25.
	0

04-05-2021, 10:45 AM	#9
Bacchus Join Date: Oct 2020 Posts: 62	My speedometer quit and I have no tachometer. I’m looking for an easy to install cluster if you know of one. But before the speedometer quit I was hitting 65 easily. With the 13/32 setup 5th gear was hard for me to reach just cruising the back roads. And when I did I had trouble keeping speed and definitely not gaining any speed after the shift to 5th. But the 12/32 makes 5th gear usable for me.
	0

04-05-2021, 01:19 PM	#10
JerseyTBR7 Join Date: Oct 2020 Posts: 130	I was looking for a plug-in simple speedo too, no luck. If mine happens to fail, likely I would just go with another original to keep it simple otherwise. You can always use the Waze app with GPS speedo in the meantime. If you happen to find one, please us know and post it.
	0

04-06-2021, 03:44 PM	#12
Bacchus Join Date: Oct 2020 Posts: 62	Okay I hit 71.5 mph today and if it weren’t so windy there was more there. I don’t know how much more but the engine wasn’t screaming. I’m 6’2” and about 165 lbs.
	0

04-14-2021, 01:39 AM	#13
buzz Join Date: Dec 2020 Location: Dayton Pa. Posts: 867	17 and 39 works great for me,can run 55 with out beating my tbr7. 200 miles and no problems, just sprockets and a chain.
	0

05-14-2021, 01:45 PM	#15
JerseyTBR7 Join Date: Oct 2020 Posts: 130	13/32 with 520 100 link chain on it now. Going to adjust to 13/33 whenever I next have to remove the back wheel for any reason.
	0