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Post Info TOPIC: gearing again , sorry chaps


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gearing again , sorry chaps
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my newly acquired 2005 ttr is geared fine for the road, 75mph + but it seems very tall on the trails,current sprockets are 14/44, I would like to try the 14/52 combo that seems to be a good compromise, but the more I read about it the more confused I'm getting, what size chain would I need?, taking into account that there must be some room for adjustment due to the stretching/wear,
I have just had a new pair of ac10s fitted with 100/100-18 on the rear if that needs to be into account,i could get hold of a chain splitter if need be,but would be easier just to get the right length in the first place.

anybody running the same gearing and tyres?

thanks in advance
nel

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Super Guru

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See here - sounds like 112 or 110 link chain is needed.

Hopefully someone with practical experience will come along to confirm!

Brian



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thanks brian
yes I saw that and thought id found my answer until I saw "correct by Yamaha but some need 112"
so a 112 then and cut if needed,
thanks

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Super Guru

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100mm is quite a tall profile tyre so it would have to go back in the swinger more than the average put it that way.

The thing with fitting a 52 sprocket is the chain will bear more heavily on the rear chain guide and some people feel when fitted, that it is enough to warrant lowering the guide see here : ttr250.activeboard.com/t57684118/lowering-chain-guide/

13/48 would work out only a touch higher gearing than 14/52, as the general rule is 1 tooth down on the front equals similar to 2-3 up on the rear.

You are going to need to play about with length a bit I think, Chain aint too much of an annoyance to break, if you cant be bothered to grind the chain rivets flat then get hold of a chain breaker with a hardened extractor.

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Pete. South Somerset, England.

03 Blue model. Renthal bars, (13/48), CRD AP2 zaust, Totally ttr's bash plate

https://m.youtube.com/channel/UCH8z1hQp6k1gM2kB5POhNfA



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Dunno what anyone else thinks, but I personally think it is better to run a 13 tooth front sprocket because a 14 runs pretty close to the case saver, and if anything ends up running through there on the chain, there could be possibility for foul up...

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Pete. South Somerset, England.

03 Blue model. Renthal bars, (13/48), CRD AP2 zaust, Totally ttr's bash plate

https://m.youtube.com/channel/UCH8z1hQp6k1gM2kB5POhNfA



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cheers peter
hmmmmmm , maybe 13/48 is the way to go then, il more than likely just fit a 13t up front to start with and see if its any more lively off road, but I cant see it making much difference tho,
hopefully they.ll be enough adjustment on the snails

I will report back as and when

thanks all


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Guru

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I buy 120 link chains then shorten them to fit...





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Bikes... 06 TTR250 / 09 XT660R / 1977 Montesa Cota 348 MRR / 1979 Montesa H6 125 Enduro...

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Nelly,

How did you go with just fitting the 13t up front to start?

Was thinking of doing the same thing this week, but its its no good ill by a 48 or 50 for the rear.

I only use my bike of road so want something for those tight steep tracks

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Super Guru

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Anything over 49 ish tooth you may have to modify your chain guide. Just make a search on here to verify.

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Pete. South Somerset, England.

03 Blue model. Renthal bars, (13/48), CRD AP2 zaust, Totally ttr's bash plate

https://m.youtube.com/channel/UCH8z1hQp6k1gM2kB5POhNfA



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Cookie123 wrote:

Nelly,

How did you go with just fitting the 13t up front to start?

Was thinking of doing the same thing this week, but its its no good ill by a 48 or 50 for the rear.

I only use my bike of road so want something for those tight steep tracks

 


 it does make a difference on acceleration and will still go 70+ on the road,although ive noticed that I have to run the chain very slightly tighter than before ,because it rubs on something on deceleration,probably the top of swing arm,when I'm ready for a new chain il look into going a couple of teeth bigger on the rear, maybe ?

our lads raid with 15/48 seems lower geared than mine but ive not had chance to ride it any distance on road ,but il be interested to know what it cruises like

hope that helps

 



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