sprockets - Honda Rebel 300 & 500 Forum
 4Likes
Reply
 
LinkBack Thread Tools
post #1 of 17 (permalink) Old 05-31-2017, 01:35 PM Thread Starter
Senior Member
 
Join Date: May 2017
Posts: 178
Garage
sprockets

so being a noob, I got a question about sprockets. Unn... so again noob, what is the point of changing out sprockets? pro's & con's?


Just curious, allot of the other forums I've rear, just about everyone replaces the sprocket with a different tooth count, but no one seems to want to mention as to why exactly, like what's it suppose to do. lol. solely curiosity. lol.
macjosh1 is offline  
post #2 of 17 (permalink) Old 05-31-2017, 01:59 PM
Senior Member
 
Join Date: Feb 2017
Posts: 814
Quote:
Originally Posted by macjosh1 View Post
so being a noob, I got a question about sprockets. Unn... so again noob, what is the point of changing out sprockets? pro's & con's?


Just curious, allot of the other forums I've rear, just about everyone replaces the sprocket with a different tooth count, but no one seems to want to mention as to why exactly, like what's it suppose to do. lol. solely curiosity. lol.
By changing the ratios you can use the power of the bike in different ways. You can make it so the bike has a bit higher top speed with less bottom end. Or the other way around.
shortyg83 is offline  
post #3 of 17 (permalink) Old 05-31-2017, 02:05 PM Thread Starter
Senior Member
 
Join Date: May 2017
Posts: 178
Garage
Quote:
Originally Posted by shortyg83 View Post
By changing the ratios you can use the power of the bike in different ways. You can make it so the bike has a bit higher top speed with less bottom end. Or the other way around.

OH! Well, learning something everyday about bikes. that doesn't sound too bad for highway travelling. which is mostly what I do. lol. Very interesting, even more when the rebels get out more and more ppl start making changes to them. thank-you
macjosh1 is offline  
post #4 of 17 (permalink) Old 05-31-2017, 04:16 PM
Senior Member
 
Join Date: Feb 2017
Posts: 814
Quote:
Originally Posted by macjosh1 View Post
OH! Well, learning something everyday about bikes. that doesn't sound too bad for highway travelling. which is mostly what I do. lol. Very interesting, even more when the rebels get out more and more ppl start making changes to them. thank-you
If you check the CBR300 forums a lot of those guys have good info on what they used for sprokets for better highway speeds.
shortyg83 is offline  
post #5 of 17 (permalink) Old 06-02-2017, 12:00 AM
Senior Member
 
Join Date: Mar 2017
Location: San Diego, Ca
Posts: 221
And just in case its not obvious, there is no free lunch with this. You can improve one dimension of your ride, but there will be a penalty to pay somewhere else.
Djdavies is offline  
post #6 of 17 (permalink) Old 06-02-2017, 08:02 AM
Super Moderator
 
01-7700's Avatar
 
Join Date: Apr 2017
Location: Maine
Posts: 1,072
Garage
Quote:
Originally Posted by Djdavies View Post
And just in case its not obvious, there is no free lunch with this. You can improve one dimension of your ride, but there will be a penalty to pay somewhere else.
This is true - here's a cool website where you can see the effect of changing sprockets on rpms, mphs, and even the wear on the chain. Gearing Commander: Motorcycle Speed, RPM, Chain & Sprockets Calculator of course it has no way to determine how the engine will perform with a different tooth count. Honda puts the ideal sprockets on their bikes to get the best performance throughout the entire range expected conditions. A smaller rear sprocket will stretch out the shift points but you may need to downshift more going up hills or to accelerate at higher speeds.

Keith from Maine USA - Rebel R1
01-7700 is offline  
post #7 of 17 (permalink) Old 06-02-2017, 11:49 AM Thread Starter
Senior Member
 
Join Date: May 2017
Posts: 178
Garage
Quote:
Originally Posted by 01-7700 View Post
This is true - here's a cool website where you can see the effect of changing sprockets on rpms, mphs, and even the wear on the chain. Gearing Commander: Motorcycle Speed, RPM, Chain & Sprockets Calculator of course it has no way to determine how the engine will perform with a different tooth count. Honda puts the ideal sprockets on their bikes to get the best performance throughout the entire range expected conditions. A smaller rear sprocket will stretch out the shift points but you may need to downshift more going up hills or to accelerate at higher speeds.
Thank-you. just the info I am looking for. I want to know if its worth it, to change something, to make it more highway friendly without sacrificing everything else. I figure there got to be enough info out there that someone discovered a happy medium. Maybe not with the new rebels yet.
macjosh1 is offline  
post #8 of 17 (permalink) Old 06-02-2017, 04:34 PM
Member
 
Join Date: May 2017
Posts: 51
Well stock is by far the best on the original Rebel. This is usually the case for low power bikes. The OEM sizes the gears and sprockets to match the torque and power available to get the most speed out of the bike possible and accelerate well also.

On larger bikes with excess torque and power, you can sacrifice top speed to gain acceleration, or vice versa you can get more top speed without sacrificing too much acceleration or drive ability.

On small bikes, there just isn't usually enough torque available to actually gain speed by dropping the rpm. The 300 has a little more torque and power than the 250. If you are looking to get better acceleration, then you can probably get that by sacrificing some top end. It is more iffy on whether you can actually get more top speed by sacrificing low end. It depends on the shape of the torque curve. You may find that after you drop the rpm, and sacrifice the acceleration, you still can't go any faster.

If you try it, I recommend just one tooth at a time to see if you get any gain. Jumping several teeth, is almost sure to be less than ideal.

What is it exactly that you actually want to improve?
76Paw is offline  
post #9 of 17 (permalink) Old 06-02-2017, 06:03 PM Thread Starter
Senior Member
 
Join Date: May 2017
Posts: 178
Garage
Quote:
Originally Posted by 76Paw View Post
Well stock is by far the best on the original Rebel. This is usually the case for low power bikes. The OEM sizes the gears and sprockets to match the torque and power available to get the most speed out of the bike possible and accelerate well also.

On larger bikes with excess torque and power, you can sacrifice top speed to gain acceleration, or vice versa you can get more top speed without sacrificing too much acceleration or drive ability.

On small bikes, there just isn't usually enough torque available to actually gain speed by dropping the rpm. The 300 has a little more torque and power than the 250. If you are looking to get better acceleration, then you can probably get that by sacrificing some top end. It is more iffy on whether you can actually get more top speed by sacrificing low end. It depends on the shape of the torque curve. You may find that after you drop the rpm, and sacrifice the acceleration, you still can't go any faster.

If you try it, I recommend just one tooth at a time to see if you get any gain. Jumping several teeth, is almost sure to be less than ideal.

What is it exactly that you actually want to improve?

Highway cruising for the most part. Most of my driving is done on the highway, averaging 110kms/hr. I make a few trips in town there and there to meet up with other folks for a coffee, average speed 70kms/hr and little bit of 50kms/hr.


So stock is probably fine, I still want to maintain low speed zipping around, I just bought the wrong bike for highway cruising maybe? haha. I've met some people that made long highway trips over multiple days with the old 250cc. They never broke down so the 300 should just be fine. However, correct me if I am wrong, the rebel 250 was completely geared differently wasn't it?
macjosh1 is offline  
post #10 of 17 (permalink) Old 06-02-2017, 07:18 PM
Member
 
Join Date: May 2017
Posts: 51
The 250 has a 5 speed, and I think your 300 has a 6 speed doesn't it?

My stock 250 runs 75 mph or 120kph pretty easily, and will break 80 mph or 130 kph with a long enough straight.

Yours is a single vs my twin, but still is supposed to have a little more torque and power. It should have a completely different feel and lower rpm power band and redline but with the 6 speed it should do a little better than that unless it is geared too low. 110 kph is only 68 mph so it should have a lot left in reserve. No need to change sprockets that I see. Have you gotten a good feel for top speed yet, or are you still breaking it in.

I know there is only one way in and one way out of Ft Mac, but those are pretty wide open 4 lanes until you get up to where the gravel begins, or you cross the bridge to nowhere. Im not sure about the speed limits, but I don't remember them being very high. I don't think they are like our Interstates where it is listed 70 mph, but everyone is going at least 80 mph or 130 kph and the 250 has to run WOT just to barely keep up. You should have no problem going fast enough to get plenty of tickets, and get in plenty of trouble with the stock setup.
76Paw is offline  
Reply

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome