Stock gearing. 70 mph riding 2 up. Never tried solo. 70 was fairly easy. Held it for several miles. Not my favorite thing to do but it is there if needed.
-
Hey Everyone! Vote for the Site Favourite BOTM winner for the year of 2022 HERE!
What's your actual top speed and on what spocket setup?... 13T front?... and can anyone please confirm that spocket compatibility.
So, my TW came with a 14T/52T... doing city so top speed is lacking, comfortably doing 70(kph)(mph would be 43.5) and topping at 95(59mph)... not enough for highway and if you ask me the lower gear fast switching is a bit much, torque is great though... thats 4% lower than 14/50T OEM.
![Brown Font Rectangle Screenshot Number]()
So i got a rear 45T on aliex, the only one available in my area... theoretically the new top speed would be 110, but its barely touching 102 where the engine cant take it anymore and dont reach full RPM... if im correct the max RPM is supposed to be 9500, and max power at 8000RPM which it doesnt reach on 14/45T... for reference im 69kg soaking wet (porn pun intended ;-)
so it seems that a lower gearing in reality equals less speed, and anyway the torque is now lacking... optimally im guessing to reach max speed the gearing should match the max speed it can give at 8000RPM or slightly above.
That new ratio is +15.6% of what i had, so the answer would be in between.
What's your actual concrete top speed and on what gearing?
for now, being a problem to get another rear sprocket, i can either go 13/45T or 15/52T which is pretty much the same ratio.
Is there any reason why a 13T in front would be problem?,... thats easier to go with that, not needing a new chain, but i dont think ive ever heard of anybody with a 13T.
And can anybody confirm if that sprocket will fit the Tdub dimension-wise?... (20mm center hole widest part and 34mm between side holes)... photoshop says most likely, but....
![Organism Font Screenshot Technology Terrestrial plant]()
![Bicycle part Font Circle Bicycle drivetrain part Gear]()
![Gear Bicycle part Bicycle Rim Auto part]()
![Bicycle part Rim Circle Pattern Auto part]()
![Purple Sleeve Pink Violet Finger]()
![Sports equipment Automotive tire Pink Red Font]()
![Font Circle Art Tints and shades Personal protective equipment]()
![Font Art Magenta Tints and shades Pattern]()
![Tire Wheel Automotive tire Motor vehicle Vehicle]()
_
So i got a rear 45T on aliex, the only one available in my area... theoretically the new top speed would be 110, but its barely touching 102 where the engine cant take it anymore and dont reach full RPM... if im correct the max RPM is supposed to be 9500, and max power at 8000RPM which it doesnt reach on 14/45T... for reference im 69kg soaking wet (porn pun intended ;-)
so it seems that a lower gearing in reality equals less speed, and anyway the torque is now lacking... optimally im guessing to reach max speed the gearing should match the max speed it can give at 8000RPM or slightly above.
That new ratio is +15.6% of what i had, so the answer would be in between.
What's your actual concrete top speed and on what gearing?
for now, being a problem to get another rear sprocket, i can either go 13/45T or 15/52T which is pretty much the same ratio.
Is there any reason why a 13T in front would be problem?,... thats easier to go with that, not needing a new chain, but i dont think ive ever heard of anybody with a 13T.
And can anybody confirm if that sprocket will fit the Tdub dimension-wise?... (20mm center hole widest part and 34mm between side holes)... photoshop says most likely, but....
_
1 - 20 of 47 Posts
im pretty sure you made a mistake on your stated gearing... with 13T/55T you should not reach over 60mph... thats a 15% higher gearing that stock.
Did you change your front wheel size?... if so, your speedmeter isnt accurate anymore btw.
67.5mm piston changes absolutely nothing, maybe 3-4cc more, stock is 67mm.
87octane neither, theres zero difference from 87 to 95 in a TW since its a low compression engine, that octane level has nothing to do with power its simply a measerment of how much compression the gaz can support before it explodes, its only meant to prevent engine clacking on high compression engines.
_
No, im not saying you're lying or anything negative, im stating that maths doesnt had up somewhere, and this might be a mistake on my side...
by "real world experience" it was assumed a lower performance that theoretically possible, not higher...
i mean want it or not its math... you got a RPM, then a primary ratio, then a secondary ratio (said gearing), and then a wheel size, and thats it... anything other than that doesnt matter on the top speed, even if the engine was 500cc.
I just dont get how you're getting 77mph with this ratio, again im not saying you're lying, im sure you're not, im just trying to understand how that would be.
thats just not an engine doing 12000rpm, i dont think you can change the primary gearing, and theres maybe the wheel size i didnt get... piston been lighter ok maybe, but if you didnt change the CDI... ?
you have a 199.32cc.. stock is 196cc... thats something, but borderline irrelevant considering a 18mph increase.
87oct or else is completely irrelevant.
did you change your internal gearing, and whats your rear wheel size more precisely?
other than that and your weight, theres pretty much nothing else... elevation is mostly an engine thing, not really an air resistance one, and this means lees oxygen, so there as well performance should decrease slightly.
real world is fine, there's just no way it can break physics obviously... ;-)
im glad to know that a 13T fits though, thanks for that... i just dont know if it will fit as well with a rear 45T.
sorry if i came as harsh, that wasnt my intention.
_
To clarify I said an indicated not actual 73, and not 77mph. Think we all know of the inherent inaccuracies of our speedos.
Perhaps a few of us can glance at a navigation screen's GPS speed readout at those speeds to glean actual speed. I'm happy to just glance at the dancing needle when one's focus really needs to be heads up and out of the cockpit. Under those circumstances I was more focused on cleaving a good line for 2 leaving room for forum member Plumbstraight who was right on my heels. He just had on his cotton logger's Hickory shirt with the torn off sleeves over cotton jeans so was even less interested in a rainy ride than I was. He was also busting an indicated 70 mph on his stock engine & geared TW. Who knows what our "actual speeds" were. Once again speeds were observed on a reasonable downgrade with a rain laden tailwind as mitigating and motivating factors. Upon reflection was running a 26" nominal height IRC TerraCross 14 x 8 on factory wire rim at 10 psi. Who knows actual diameter at speed.
![Tire Wheel Automotive tire Tread Synthetic rubber]()
Tire diameters change with speed, temperature and tire construction thus changing final drive ratios that simple linear math does not account for...just ask any drag racer and what the non-linear changing diameter of drag slicks can do for gear ratios as speed increases.
I certainly do not argue the basics of gear ratios but years of various testing often revealing deviations from results predicted by accepted theories makes me try to avoid drawing exact conclusions about what is, or is not possible or probable. Usually there are other variables at play not accounted for when something does not adhere to the statistical norm. Still we like to speak in generalities, the central tendencies, the 95th percentile , or N95 as was made so popular during COVID ( filter material targets retention of 95% of particulates larger than 5 microns, says nothing about leakage around mask. Never mind the virus is about 0.1 microns in diameter, 1/50th of the mask's target particle size).
Sorry for rant but spent time qualitatively measuring respirator filtering for OSHA compliance. Have to know your stuff to confidently tell a burly drill rig roustabout that not only does he have to wear a respirator but he has to shave his beard baby smooth or don't come to work. N95 masks and most respirators are fairly ineffective, better is anything positive pressure like a PARP or Racal air hood.
Perhaps a few of us can glance at a navigation screen's GPS speed readout at those speeds to glean actual speed. I'm happy to just glance at the dancing needle when one's focus really needs to be heads up and out of the cockpit. Under those circumstances I was more focused on cleaving a good line for 2 leaving room for forum member Plumbstraight who was right on my heels. He just had on his cotton logger's Hickory shirt with the torn off sleeves over cotton jeans so was even less interested in a rainy ride than I was. He was also busting an indicated 70 mph on his stock engine & geared TW. Who knows what our "actual speeds" were. Once again speeds were observed on a reasonable downgrade with a rain laden tailwind as mitigating and motivating factors. Upon reflection was running a 26" nominal height IRC TerraCross 14 x 8 on factory wire rim at 10 psi. Who knows actual diameter at speed.
Tire diameters change with speed, temperature and tire construction thus changing final drive ratios that simple linear math does not account for...just ask any drag racer and what the non-linear changing diameter of drag slicks can do for gear ratios as speed increases.
I certainly do not argue the basics of gear ratios but years of various testing often revealing deviations from results predicted by accepted theories makes me try to avoid drawing exact conclusions about what is, or is not possible or probable. Usually there are other variables at play not accounted for when something does not adhere to the statistical norm. Still we like to speak in generalities, the central tendencies, the 95th percentile , or N95 as was made so popular during COVID ( filter material targets retention of 95% of particulates larger than 5 microns, says nothing about leakage around mask. Never mind the virus is about 0.1 microns in diameter, 1/50th of the mask's target particle size).
Sorry for rant but spent time qualitatively measuring respirator filtering for OSHA compliance. Have to know your stuff to confidently tell a burly drill rig roustabout that not only does he have to wear a respirator but he has to shave his beard baby smooth or don't come to work. N95 masks and most respirators are fairly ineffective, better is anything positive pressure like a PARP or Racal air hood.
TW sprockets on the small end of the spectrum can cause sawing and damage to the top of swingarm. The 13 tooth up front needs a 50 tooth at least to lift the chain off the swing arm's chain slider during most of the suspension's admittedly limited 6 inch ravel.
As far as what constitutes the ideal gearing for first ( and all gears for that matter) is a function of one's riding terrain and riding style. For example I spent significant time in first gear today happily with 13 x 55 sprockets basically "jeeping" through mud, flowing water, bashing through snow banks & negotiating good sized rocks that would be more difficult with a 14 or 15 tooth front sprocket. While this is good for me I would never tell someone that they need to do what I do.
I applaud others stating what works best for them but don't let them tell you what is best for YOU. Their extreme challenging trail may be everyday milk toast for you, or vis versa. Not everything is smooth or flat, some of us have to share steep rocky roadbeds with the occasional whitewater rapids, best comfortably done at a moderately slow pace so as to react to submerged surprises.
This was typical conditions today.
![Mirror Plant Tree Automotive mirror Motor vehicle]()
As far as what constitutes the ideal gearing for first ( and all gears for that matter) is a function of one's riding terrain and riding style. For example I spent significant time in first gear today happily with 13 x 55 sprockets basically "jeeping" through mud, flowing water, bashing through snow banks & negotiating good sized rocks that would be more difficult with a 14 or 15 tooth front sprocket. While this is good for me I would never tell someone that they need to do what I do.
I applaud others stating what works best for them but don't let them tell you what is best for YOU. Their extreme challenging trail may be everyday milk toast for you, or vis versa. Not everything is smooth or flat, some of us have to share steep rocky roadbeds with the occasional whitewater rapids, best comfortably done at a moderately slow pace so as to react to submerged surprises.
This was typical conditions today.
thats all good on your trail situation (looks fun btw ;-), but since im doing 99.5% flat city road, do you believe i would be fine with a 13/45T.. ???
...or maybe a strapped rubber tube layer to protect that swingarm area...?
i see that 14/42T is quite common, so 13/45T doesnt seems much of a stretch...
thats my 14/45T situation if thats any help... i cant say i do see much, but...
_
1 - 20 of 47 Posts
