Rear pulley choices?

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May 20, 2013 | 12:22 PM

#11

MyClassic09

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From: Houston

so if go with a 2008....and it has 66T pulley and get a new belt

how will that effect low and top end

May 20, 2013 | 02:19 PM

#12

grbrown

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From: Bedford UK

Quote:

Originally Posted by MyClassic09

so if go with a 2008....and it has 66T pulley and get a new belt

how will that effect low and top end

Have you confirmed you have a 2008 wheel, with IDS? Assuming you currently have a 70T, a change to 66T will raise your gearing by 70/66 or 6%. In other words current 3,000rpm engine speed will drop to 2,828rpm at the same road speed. That gives an overall drive ratio of 3.18:1, which IMHO on a 5 speed trans is too much. Stock is 3.37:1.

So let us look at also fitting that DD6 and play with some numbers. Baker recommend changing the compensator from the standard 24T to 28T. On a stock bike with 32/70 belt drive, that will give a 5th gear of 3.32:1, almost identical to your current top gear, with a 6th 'overdrive' of 2.89:1. Baker also offers an alternative 27T compensator.

If we fit your 66T rear pulley, but fit a 27T compensator, hey presto, we get a 5th gear of 3.25:1, very close to your current top gear, with a 6th gear of 2.83:1, very close to the 6th gear above. How does that sound?

May 20, 2013 | 02:46 PM

#13

MyClassic09

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From: Houston

Quote:

Originally Posted by grbrown

Have you confirmed you have a 2008 wheel, with IDS?

no I don't...im thinking its a 2007..so non -ids...both sides are same looking but I cant find any pics of a 2008 wheel on both sides...only see 09+

so don't know if the 08 just adds the bowl compensator to the wheel and is fastened that way with 5 bolts and then the outer pulley is just put on there with a bearing and then the vibration is nulled by the rubber isolators inside the bowl?

the gearing sounds good to use the 66 and the 27

May 20, 2013 | 02:57 PM

#14

grbrown

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From: Bedford UK

According to Ronnies the 08 rear wheel is the same as your 07, the rear compensator is an add-on. That means you should be able to fit a 70T pulley, to keep your gearing as is, if you want to. A 27T front compensator is still worth considering as you will get slightly lower 1st gear, but still have an overdrive style 6th.

May 20, 2013 | 03:03 PM

#15

MyClassic09

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From: Houston

yeah im trying to read up on the ids retrofit...and see if its worth it....as I have to buy the stuff anyway...

some say they can feel less vibration...then you also have the bearing failure...