40 T rear sprocket

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Re: 40 T rear sprocket

Post by GaryCulb » Sat Feb 03, 2018 2:17 am

Aussie Dave,

Well I’ll be damed!!

Thanks for the data. You are Correct. SuperSprox Rear Sprocket Engraving Goes IN!! Only had a couple hundred miles on that rear 40T/ 525 Black SuperSprox sprocket before the flip??

Best,

Doc :oops: :oops:


INCORRECT:

Image


CORRECT:

Image

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Re: 40 T rear sprocket

Post by Aussie Dave » Sat Feb 03, 2018 8:34 pm

Cheers mate.......I nearly did the same........looked so pretty I almost whacked it on without a thought, but a little voice from behind said 'wait a minute.......' :lol: ........ must have been my cousin the bike mechanic, keeping an eye on my feeble attempts to emulate his ability and knowledge..... :lol:

Super Sprox could have put an instruction sheet or a warning sticker on.....but I suppose they figure we should know...... :roll:
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Re: 40 T rear sprocket

Post by Aussie Dave » Sat Feb 10, 2018 6:28 am

Oh yessssss......thaaaat's nailed it :D

Short ride via the motorway to Saturday coffee with world tourer mates and I had almost forgotten I had installed the 40T until I realised the Gt was much more civilised in city traffic :o

It is heaps smoother to ride at traffic speed limits.....reason being, the motor is now in the sweet spot more readily than before (with 38T).

So, at 100kph Aussie national speed limit, my tach shows 4500rpm (was 4250 with 38t).

At 60kph suburban traffic limit, in 3rd gear as usual, 4000rpm on tach (was 3750) = bike felt totally at home whereas before it was only just happy and i had to be prepared to downshift to 2nd if I needed to accelerate with vigour. Similarly for 80kph in 4th..4250rpm (i think..can't recall now but it was all good).

Totally recommend Aussie GT owners do the 40T rear sprocket change unless you have access to (ie; no eyes watching ;) ) open road territory........

Euro riders have higher Motorway/Autostrada limits and would probably prefer OEM38T or maybe 39T - but for Aus, the 40 is great (just forget about 6th unless you want to split the gearbox and change the internal ratios or have a tail wind riding downhill :lol: ).
Current delights...1290GT-2017, CBR1100XX-2005

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Re: 40 T rear sprocket

Post by DaveW » Wed Feb 14, 2018 6:14 am

I got hold of supersprox var email today to get a 40 as out of stock 😂
Their response was the next order due in was April .
I've got my name on one of them.
With a 17/38 its 4th gear around our roads.
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Re: 40 T rear sprocket

Post by Aussie Dave » Tue Feb 20, 2018 6:17 am

Cheers mate, 17/40 will be very nice. Its the biggest that will fit without changing to a longer chain and it will add 250rpms to the tacho - which is just enough to keep the motor in it's sweet spot at all times (like around town in traffic as well as out on the open road). It is no miracle cure but the GT ratios were not that far off to drop a tooth on the front - and the rear is one very fast 'quick change' system......2 sockets and the tool kit chain adjuster and you are done........just keep in mind the machined/dished side goes in as per photo's above eh ;)
Current delights...1290GT-2017, CBR1100XX-2005

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Re: 40 T rear sprocket

Post by Aussie Dave » Sat Feb 24, 2018 11:49 pm

:D :D :D

Yep...... 40T is the best option...... ;)
GT Sunday 25Feb018......jpg
GT Sunday 25Feb018......jpg (57.54 KiB) Viewed 1719 times
Got out while the sun was shining this morning.......chheeeze....heaviest Feb rainfall for 43 years (new official record)... local flooding etc etc.....still, grass is really green now :lol: .... sun is hot when out from cloud cover and therefore steamy humid at only 25C (with all that moisture around).......more rain coming mid morning but nice while riding.....got home by 9am :)

Only a short test ride 40kms down the freeway to Yatala BP roadhouse for a Macca's coffee and English Muffin in air-con cafe (that's the toasted bread muffin with butter and jam......not the two legged version :roll: ) ....19.2k/ltr showing on dash which I have previously checked with the pump fill average.....so that's all good.

Ok, the thing does 4500rpm in 5th with 101/102 showing on dash ( =100kph Garmin), I slipped it into 6th......revs dropped to 4000 at 102kph = little bit unhappy and would struggle to maintain that speed into a headwind.......tried it in 110kph zone .. 4200rpms... better, still marginal, but ok ....so I reckon at open road touring speeds (ie cruising lonely back roads revs at 4500), 6th is now useable without gripes from the 1290's motor.

Can't comment on any full tank fuel range (fully loaded/with passenger) but I expect minimal reduction unless you thrash the GT unmercifully ....... oh, and the low speed urban stuff is excellent.......gearbox ratios are now spot on :D (accepting 6th as an overdrive ;) ).

PS can't wait till I wear the Angel GT's out and get a pair of the new Michelin PR5's ..... :mrgreen:
Current delights...1290GT-2017, CBR1100XX-2005

Prev loves...Capo1200TP-014, CBR11xx-002, 2xFZR1000genisis-94, FJ1200-89, FJ1100-84, XS1100P, VF1000F-83, CX500, VF750S, KZ1000J1-81, KZ1000ST-79, CB750F2-77, CB360T-74, CB175.. started it all in 1974 ;)

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Re: 40 T rear sprocket

Post by DaveNZ » Sun Feb 25, 2018 1:25 am

Aussie Dave wrote:
Sat Feb 24, 2018 11:49 pm
:D :D :D

Yep...... 40T is the best option...... ;)

GT Sunday 25Feb018......jpg

Got out while the sun was shining this morning.......chheeeze....heaviest Feb rainfall for 43 years (new official record)... local flooding etc etc.....still, grass is really green now :lol: .... sun is hot when out from cloud cover and therefore steamy humid at only 25C (with all that moisture around).......more rain coming mid morning but nice while riding.....got home by 9am :)

Only a short test ride 40kms down the freeway to Yatala BP roadhouse for a Macca's coffee and English Muffin in air-con cafe (that's the toasted bread muffin with butter and jam......not the two legged version :roll: ) ....19.2k/ltr showing on dash which I have previously checked with the pump fill average.....so that's all good.

Ok, the thing does 4500rpm in 5th with 101/102 showing on dash ( =100kph Garmin), I slipped it into 6th......revs dropped to 4000 at 102kph = little bit unhappy and would struggle to maintain that speed into a headwind.......tried it in 110kph zone .. 4200rpms... better, still marginal, but ok ....so I reckon at open road touring speeds (ie cruising lonely back roads revs at 4500), 6th is now useable without gripes from the 1290's motor.

Can't comment on any full tank fuel range (fully loaded/with passenger) but I expect minimal reduction unless you thrash the GT unmercifully ....... oh, and the low speed urban stuff is excellent.......gearbox ratios are now spot on :D (accepting 6th as an overdrive ;) ).

PS can't wait till I wear the Angel GT's out and get a pair of the new Michelin PR5's ..... :mrgreen:
The 1290 is very lean in that rev range, it will like 6th gear better after 5500 Revs where the fueling is better, my 1290 will run nicely as low as 100Kms in 6th no worries, but I've remove the O2 sensors, and fitted little dongle plugs that up the fuel % mixture in the low rev range. i manage a 200Km ride on my Multi this morning, hadn't ridden the bike for ages, and it was fun to have a blast on the old bitch.
2016 1290GT-remus link and muffler, 2010 Black 1200 Multistrada full Termi system with mapping, 2005 SMR 640, full Titanium system, Mikuni flatside racing carb, 2 sets of wheels, 18 litre tank, and a nice soft seat.

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Re: 40 T rear sprocket

Post by Clogan » Mon Feb 26, 2018 11:10 pm

Please have patience with this poor country boy from Tennessee; I am trying to understand the rationale in support of a different rear sprocket. I like to cruise at least at 4500 rpms or so. My SDGT, with all-stock gearing, runs just fine in a 45 mph speed zone if I stay in 3rd gear. For a 55 mph zone, I shift up to 4th. In both cases I am tooling along at approx 4500 rpms. Only when on the interstate, with speed limits of 65, or 70, do I shift to 5th gear. I do not ride at speeds that necessitate using 6th gear. As far as I'm concerned, 6th gear is not needed. 5th seems to do just fine up to 100+. And that's plenty for me.

Please help me understand why a different rear sprocket is better. It seems to me that 4500 rpms is still 4500 rpms, regardless of whether you are in 3rd gear or 4th gear. Why in the world would a person swap sprockets if the only result is more shifting? Seems like less shifting would be better.

My SDGT sorta reminds me of the good old days, way back when 4 speeds were all you had: lots less shifting, and lots more riding in 2nd and 3rd. 4th was for 55 mph and up.

Then there was my first car, a 1962 Impala, with only TWO gears (Chevy hydromatic). But that's really going too far back!

Anyhow, why is a different rear sprocket better...or is it just fifferent?

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Re: 40 T rear sprocket

Post by DaveNZ » Mon Feb 26, 2018 11:57 pm

i guess it depends on what type of roads you ride Clogan, I'm mainly riding back roads, and with the 40 tooth rear sprocket, it bring the gear ratios closer together which helps in short shifting, as i brings each gear change closer together, also on tighter corners where i couldn't use 3rd only second, it now makes 3rd an option, i also feel it helps the quick shifter as it brings each ratio slightly closer together. but there is a limit to gearing a big torquey twin down, too lower a gearing you loose the feel of big torque driving big gears.
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Re: 40 T rear sprocket

Post by GaryCulb » Tue Feb 27, 2018 12:52 am

Clogan,

Agree with DaveNZ. The bike is much more functional not only on the Highway but, also in the Twisty's. Here a couple of examples: My times on the Tail of the Dragon in NC were almost a full 45 to 50 seconds faster with the 40T rear sprocket. I can actually put the KTM SDGT in 6th gear & float down the highway at 83 to 85 mph with plenty of reserve. Otherwise 6th gear is totally useless unless you plan on traveling >90 mph.

Here is link that may be of assistance: https://www.bikebandit.com/blog/post/ho ... -sprockets

Best,

Doc :) :)

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Re: 40 T rear sprocket

Post by Clogan » Wed Feb 28, 2018 12:34 am

Reminds me of a Mustang I had once: changed the OEM gear (3.53?) in the diff to a 4.10.

Man was that thing quick off the line! Only thing was, 1st gear was only good to about 15 mph, LOL! Plus, I was always shifting gears.

Anyhow, I think I'll pass on changing my sprocket just now, and wish you gents miles and miles of safe riding.🏍👍

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Re: 40 T rear sprocket

Post by jjscsix » Wed Feb 28, 2018 2:04 am

Dave, I'm guessing you actually know that changing a sprocket does not make the gears closer together. It only seems that way and I get your point.
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Re: 40 T rear sprocket

Post by DaveNZ » Wed Feb 28, 2018 3:35 am

jjscsix wrote:
Wed Feb 28, 2018 2:04 am
Dave, I'm guessing you actually know that changing a sprocket does not make the gears closer together. It only seems that way and I get your point.
True, it seems they are closer together because the engine spins up quicker,
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Re: 40 T rear sprocket

Post by Aussie Dave » Wed Feb 28, 2018 8:00 am

Shitbuggerbum.......lost the draft....... :x

Oh well, doesn't matter, I like my shiny new rear 40T - it looks nice :lol: , but it also makes the GT feel much less on the edge in everyday riding without losing all that we like about the 'Beast'.

Different countries have different speed limits - and corner radius's etc......but if the GT feels fine then that's all that matters.

It took me ages to get my hands on a steel sprocket (I knew from the first ride that the oem gearing was close, but not quite right for Aussie roads and traffic). OEM was ok, and I was prepared to leave it standard, but now that it is converted, I'm very pleased with the change (remember the 40T only increases rpm by 250, and the 39T probably by 150.....at 100kph ;) ..).

Personal choice to suit local conditions.......not an essential thing (not like the Caponord 1200 gearing eh DaveNZ? ;) ).

Ps nearly forgot...... I too thought the sprocket change wouldn't alter the gap but bugger me......what was a 700/750rpm gap from 5th to 6th at 100kph is now a 500/550rpm gap at 100kph......maybe I just haven't ridden it enough and have miss read the tacho :| .......and it doesn't matter - all that matters is enjoying the ride..... :D
Current delights...1290GT-2017, CBR1100XX-2005

Prev loves...Capo1200TP-014, CBR11xx-002, 2xFZR1000genisis-94, FJ1200-89, FJ1100-84, XS1100P, VF1000F-83, CX500, VF750S, KZ1000J1-81, KZ1000ST-79, CB750F2-77, CB360T-74, CB175.. started it all in 1974 ;)

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Re: 40 T rear sprocket

Post by mick shere » Wed Feb 28, 2018 9:26 pm

Thats a great point about local (ie Countries) speed limits, in the UK its
town 30mph (50kph)
A roads ie main roads (usually) 60mph (96kph)
motorways 70mph (113kph)

and with the ever increase of "safety vans" (parking in usually stupid and dangerous places) you have to be "careful" Our government is very kindly providing smart motorways with overhead gantries flashing changeable speed limits up which turn on speeding cameras when in use (except it turns out some authorities leave them turned on all the time)

PS each minor speeding offence eg 33 in a 30 limit gives you 3 points.. 12 points in 3 years gives you a 12 month ban.

Apologies for the rant but it sucks

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Re: 40 T rear sprocket

Post by GaryCulb » Thu Mar 01, 2018 1:54 am

mick shere,

That realy s-cks!! No wonder you guys are constantly traveling off the island. Best,

Doc :shock: :shock:

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Re: 40 T rear sprocket

Post by MarkLH69 » Thu Mar 01, 2018 3:11 am

Its just as bad (probably worse) in most of Australia unfortunately.

Serious crimes going up through the roof, whilst the government spending millions on new speed cameras and hiding them in bushes etc .. at least in Western Australia.

Speed cameras bring in the $ .. no money in catching crims who can't / won't pay their fines anyway.

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Re: 40 T rear sprocket

Post by DaveNZ » Thu Mar 01, 2018 4:03 am

mick shere wrote:
Wed Feb 28, 2018 9:26 pm
Thats a great point about local (ie Countries) speed limits, in the UK its
town 30mph (50kph)
A roads ie main roads (usually) 60mph (96kph)
motorways 70mph (113kph)

and with the ever increase of "safety vans" (parking in usually stupid and dangerous places) you have to be "careful" Our government is very kindly providing smart motorways with overhead gantries flashing changeable speed limits up which turn on speeding cameras when in use (except it turns out some authorities leave them turned on all the time)

PS each minor speeding offence eg 33 in a 30 limit gives you 3 points.. 12 points in 3 years gives you a 12 month ban.

Apologies for the rant but it sucks
I got let off a speeding ticket while down in the South Island, he clocked us at 138, the cop waved me over as i was in front, he said he couldn't be sure which bike was in front and which one he clocked, bloody lucky as i was way in front, and it was for 38K over the limit, was my lucky day,
2016 1290GT-remus link and muffler, 2010 Black 1200 Multistrada full Termi system with mapping, 2005 SMR 640, full Titanium system, Mikuni flatside racing carb, 2 sets of wheels, 18 litre tank, and a nice soft seat.

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Re: 40 T rear sprocket

Post by DaveW » Thu Mar 01, 2018 4:28 am

You are right Mark.

Speaking for my self (as a middle class new Zealander) we can afford to pay for a GT and Insurance !!!!
So who better is the better person to pick on to pay fines ???

100 km speed limit here. 140km and you are walking (unless you are Dave NZ) :?

My answer, is a radar detector NEVER leave home with out it

Its saved my bacon on plenty of occasions and has paid for its self time and time again

They are illegal in Oz right ??

cheers
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Re: 40 T rear sprocket

Post by DaveNZ » Thu Mar 01, 2018 4:50 am

I have a radar detector on both my bikes and also the car DaveW, its quite scary riding without one.
2016 1290GT-remus link and muffler, 2010 Black 1200 Multistrada full Termi system with mapping, 2005 SMR 640, full Titanium system, Mikuni flatside racing carb, 2 sets of wheels, 18 litre tank, and a nice soft seat.

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