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 13 - 47t vs 13 - 48t

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haygood




PostSubject: 13 - 47t vs 13 - 48t   Wed Feb 26, 2014 7:09 pm

Getting ready to pull the trigger on a new rear sprocket. Is their much difference between these two other than one tooth? Any input is appreciated.
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rocketjump




PostSubject: Re: 13 - 47t vs 13 - 48t   Wed Feb 26, 2014 8:34 pm

I have 13/48 and feel it is a little bit crazy.  I top out at around 70 mph (with a SpeedoDRD) and the engine revs quite high at that point and there is not much power left for overtaking.  That's on the freeway though.  In the city, the 48 rear is a lot of fun.  Coming from 13/43, there is a crazy amount of torque now available.

If I did it again, though, I would probably go with a 47 as a better compromise.
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haygood




PostSubject: Re: 13 - 47t vs 13 - 48t   Wed Feb 26, 2014 9:07 pm

Im leaning towards the 47 maybe even a 46. I do a decent amount of highway riding. Will the 47 get the front off the ground without clutching?
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rsteiger

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PostSubject: Re: 13 - 47t vs 13 - 48t   Wed Feb 26, 2014 11:37 pm

I was running 13/48 in Colorado this year when doing the COBDR.  Worked out fairly well especially with the power loss from the altitude that we were riding at.  

Once I got back to GA I went to 14/48 and that was much better on the road and thought that I would just switch front sprockets if I got into anything tight.  Then I tried 14/50 and that seems to be a pretty good overall compromise.
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4play

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PostSubject: Re: 13 - 47t vs 13 - 48t   Thu Feb 27, 2014 12:18 am

14/49 on mine with an MT43 rear tire, cruises 65-70 (actual speed) amazingly well & will climb anything I can keep the front tire down for.
50T rear might be perfect.
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motokid
Moderator
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PostSubject: Re: 13 - 47t vs 13 - 48t   Thu Feb 27, 2014 9:57 am

rocketjump wrote:
I have 13/48 and feel it is a little bit crazy.  I top out at around 70 mph (with a SpeedoDRD) and the engine revs quite high at that point and there is not much power left for overtaking.  That's on the freeway though.  In the city, the 48 rear is a lot of fun.  Coming from 13/43, there is a crazy amount of torque now available.

If I did it again, though, I would probably go with a 47 as a better compromise.

You top out at 70mph????? scratch 

I have a 13/48 combo and I top out at around 84 mph.

I love the 13/48 combo.  cheers 



_________________
2008 WR250X
Gearing: 13t - 48t
Power Commander 5 / PC-V
Airbox Door Removed - Flapper glued - AIS removed
FmF Q4
Bridgestone Battlax BT-003rs
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BuilderBob

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PostSubject: Re: 13 - 47t vs 13 - 48t   Thu Feb 27, 2014 10:37 am

I have a 14/50 combo. Perfect for the dirt around here.
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4play

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PostSubject: Re: 13 - 47t vs 13 - 48t   Thu Feb 27, 2014 11:08 am

Nice tool here:

http://www.gearingcommander.com/



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haygood




PostSubject: Re: 13 - 47t vs 13 - 48t   Thu Feb 27, 2014 10:01 pm

Thanks for everyone's input.
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rocketjump




PostSubject: Re: 13 - 47t vs 13 - 48t   Thu Feb 27, 2014 10:22 pm

motokid wrote:
rocketjump wrote:
I have 13/48 and feel it is a little bit crazy.  I top out at around 70 mph (with a SpeedoDRD) and the engine revs quite high at that point and there is not much power left for overtaking.  That's on the freeway though.  In the city, the 48 rear is a lot of fun.  Coming from 13/43, there is a crazy amount of torque now available.

If I did it again, though, I would probably go with a 47 as a better compromise.

You top out at 70mph????? scratch 

I have a 13/48 combo and I top out at around 84 mph.

I love the 13/48 combo.  cheers 



It could go faster, but I don't like stressing the engine and the bike feels really unstable. So, I comfortably top out at 70 :p

To answer another above question, 13/47 would definitely get the front off the ground in 1st with no clutch. 2nd would be tougher but possible.
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dmmcd

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PostSubject: Re: 13 - 47t vs 13 - 48t   Fri Feb 28, 2014 10:28 am

rocketjump wrote:


It could go faster, but I don't like stressing the engine and the bike feels really unstable.  So, I comfortably top out at 70 :p

To answer another above question, 13/47 would definitely get the front off the ground in 1st with no clutch.  2nd would be tougher but possible.

13/45 will easily lift the front in 1st with no clutch.

You also have to keep in mind the people giving recommendations, some have an X and some have an R. The different size rear wheel will make some difference. My 13/45 is good for daily commuting where my typical cruising speed is 45-55 mph (on an X). I have a short stretch of highway, and it has no problem holding 75 to 80 mph. I will probably go to a 46 or 47 rear for the next replacement.
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soupbowl

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PostSubject: Re: 13 - 47t vs 13 - 48t   Tue Mar 17, 2015 2:40 pm

I have been running 13/48 for awhile now and I think 46-47 is where I want to be.
1st and 2nd with a 48 are so short and the throttle is ultra sensitive on first and second.
That being said I like the low end you gain from 3rd up. I just feel that 1st and 2nd
are so awkward I it takes away from the other fun.
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4play

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PostSubject: Re: 13 - 47t vs 13 - 48t   Tue Mar 17, 2015 2:57 pm

You really may want to try a 14 front with the 48 rear.
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soupbowl

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PostSubject: Re: 13 - 47t vs 13 - 48t   Tue Mar 17, 2015 6:40 pm

4play wrote:
You really may want to  try a 14 front with the 48 rear.

Yeah, I think I will have to reconsider a 14 on the front. Took a look at it on gearingcommander.com
and It looks like it will get me where I want to be. Thanks.
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beefcakemorris

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PostSubject: Re: 13 - 47t vs 13 - 48t   Tue Mar 24, 2015 8:34 pm

I have a sun star 47 tooth sprocket for sale. If you interested
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KiLLeRrKeN




PostSubject: Re: 13 - 47t vs 13 - 48t   Wed Mar 25, 2015 11:58 am

All these answers making me happy lol I ordered a 13/48 with new chain to go on Friday, I can't wait
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Lillriko




PostSubject: Re: 13 - 47t vs 13 - 48t   Thu Mar 26, 2015 8:27 pm

I'm getting ready to do that set up right now! bannana
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Gath3r13

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PostSubject: Re: 13 - 47t vs 13 - 48t   Fri Mar 27, 2015 8:18 am

I ran 13/48 last season.
I mainly ride in the New England woods. I found that I seemed to be sitting right between 1st and 2nd gear a lot.
I am putting on a 50T rear this season.
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JS5Owner




PostSubject: Re: 13 - 47t vs 13 - 48t   Fri Mar 27, 2015 3:23 pm

Gath3r13 wrote:
I ran 13/48 last season.
I mainly ride in the New England woods. I found that I seemed to be sitting right between 1st and 2nd gear a lot.
I am putting on a 50T rear this season.

13/50 is what I run here in the So. Cal. desert, washes, and mountains... The torque is fantastic.
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TKO

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PostSubject: Re: 13 - 47t vs 13 - 48t   Sat Mar 28, 2015 10:05 am

4play wrote:
14/49 on mine with an MT43 rear tire, cruises 65-70 (actual speed) amazingly well & will climb anything I can keep the front tire down for.
50T rear might be perfect.

I run 14/50 with a MT-43 rear tire for my "all around gearing" and like it very much.

I throw on a 13 front for severely nasty, elevation change single trail stuff and love the way it "chugs".
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Biglake




PostSubject: Re: 13 - 47t vs 13 - 48t   Sat Mar 28, 2015 11:04 pm

Gath3r13 wrote:
I ran 13/48 last season.
I mainly ride in the New England woods. I found that I seemed to be sitting right between 1st and 2nd gear a lot.
I am putting on a 50T rear this season.

I had that issue when I had 13-50 and a small rear tire (worn down 100/100 tm2, 13-50 was great with a big tall tire) 14-50 is better for me with a small rear tire, I can stay in low a lot more riding the speed I want to. The guys I ride with seam to go about as fast as 14-50 in first is when riding the local nasty muddy trails.

Im getting 13-48 (I need a new chain anyhow mines starting to kink) for this year to go with a 110/100 tire, it should be really close to 14-50 with a small tire plus I can put the 14 front back on for long road trips if I ever do them.

You need to consider tire height when picking sprockets as it makes a couple of teeth difference, ie 13-48 with a stock sized tire is roughly equal to 13-50 with a 120/100.
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doc_simple

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PostSubject: Re: 13 - 47t vs 13 - 48t   Fri Apr 10, 2015 8:59 pm

Biglake wrote:
Gath3r13 wrote:
I ran 13/48 last season.
I mainly ride in the New England woods. I found that I seemed to be sitting right between 1st and 2nd gear a lot.
I am putting on a 50T rear this season.

I had that issue when I had 13-50 and a small rear tire (worn down 100/100 tm2, 13-50 was great with a big tall tire) 14-50 is better for me with a small rear tire, I can stay in low a lot more riding the speed I want to. The guys I ride with seam to go about as fast as 14-50 in first is when riding the local nasty muddy trails.

Im getting 13-48 (I need a new chain anyhow mines starting to kink) for this year to go with a 110/100 tire, it should be really close to 14-50 with a small tire plus I can put the 14 front back on for long road trips if I ever do them.

You need to consider tire height when picking sprockets as it makes a couple of teeth difference, ie 13-48 with a stock sized tire is roughly equal to 13-50 with a 120/100.


so when i switch from the kenda trackmaster II with 13-48 to the MT43 it will be like a 13-50, or the other way around?

gearing is nuts...
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CC_Rider




PostSubject: Re: 13 - 47t vs 13 - 48t   Tue Sep 29, 2015 9:03 pm

I just went with 13/47, and swapped the stock trailwangs out for heidenau k60 scouts. The scout is a 120/90-18, and sits higher than the stock tire. With the new gearing and new tire the bike is unexpectedly tall (gear wise) I'm looking at a 14 tooth for longer trips. I had done some research beforehand on gearing and didn't expect the 47 to make such a difference. I miss the longer 1st gear around town but I'm sure I won't once I hit the trail.

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TKO

avatar


PostSubject: Re: 13 - 47t vs 13 - 48t   Wed Sep 30, 2015 10:38 am

doc_simple wrote:
Biglake wrote:
Gath3r13 wrote:
I ran 13/48 last season.
I mainly ride in the New England woods. I found that I seemed to be sitting right between 1st and 2nd gear a lot.
I am putting on a 50T rear this season.

I had that issue when I had 13-50 and a small rear tire (worn down 100/100 tm2, 13-50 was great with a big tall tire) 14-50 is better for me with a small rear tire, I can stay in low a lot more riding the speed I want to. The guys I ride with seam to go about as fast as 14-50 in first is when riding the local nasty muddy trails.

Im getting 13-48 (I need a new chain anyhow mines starting to kink) for this year to go with a 110/100 tire, it should be really close to 14-50 with a small tire plus I can put the 14 front back on for long road trips if I ever do them.

You need to consider tire height when picking sprockets as it makes a couple of teeth difference, ie 13-48 with a stock sized tire is roughly equal to 13-50 with a 120/100.


so when i switch from the kenda trackmaster II with 13-48 to the MT43 it will be like a 13-50, or the other way around?

gearing is nuts...


Other way around. thumb
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greenboy

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PostSubject: Re: 13 - 47t vs 13 - 48t   Wed Sep 30, 2015 11:24 am

I too have a tire with a lot larger diameter than stock -- Mitas E-07 120/80-18 -- Which really is more like an 87.3% profile as far as circumference goes. Depending on what you have around for a measurement of the tire diameter at a pressure you might be using, that may be the harder part ; } ...Because it doesn't take long to get all this figured out in Gearing Commander which even has a presets for stock WR250R and X. Based on measured tire diameter * pi, which you input into the tire circumference field for CURRENT and/or CUSTOM, that will calculate a PROFILE percent also -- which you can use for calculations in 12oClockLabs' SpeedoDRD calculator if you don't use a GPS to help calibrate their speedometer healer.

http://www.gearingcommander.com/

http://www.12oclocklabs.com/sdrd_calc.htm
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