Query Approved.

Hey dude, what Pulsar is that? Being a bit more specific about your bike usually helps get better replies around here. You could also post a pic of ths swingarm (esp the part which seems like 'extra material') so the experts could tell you if that's really what it looks like.

Taking off the chain guard has its own pros and cons - there's a thread called 'Naked Chain, Function or Fashion' probably in the 'Universal Threads' section catering to that topic. I'd recommend you take a look at it.

Personally speaking, I've got a P180UG3 running without the chain-guard for about 6months now with almost no problems so far (thank GOD ) except that the chain requires quite more oiling and cleaning than it used to earlier. Besdes, the chain guard also comes with a marking showing the optimal chain setting at all times; without the guard you're going to have to rely on your own (or your mechanic's) judgement about this setting. AND BTW, my

bike's got an MRF Zapper 120/70/17 tyre fitted in the rear perfectly for more than 2 months now.

Also, most of the times you could stretch out the chain a bit and fit the tyre in the swingarm (without any other modifications needed) but then if you happen to change the chain sometime later, you're gonna have issues fitting the tyre in since the new chain won't be so 'stretchable' initially.


Hope that helps somehow....

thanks for the help

yeah I'm sorta new to this forum... so gotta figure out how to upload photos... I have the same bike... Pulsar 180 UG3.....Got the chain guard removed today and it helped a lot( before it was making this constant noise due to the contact) and now its not making the noise... but I still think there is minor contact with that extra part of the swing arm since the movement of the wheel isn't as free as before... anyways... Just got a chance to see the replies now... but I have already given the bike to my local mechanic who is gonna get the extra piece of the swing arm removed by a welder... Didn't know that you can stretch the chain to accommodate the tire in the swing arm... sort of a noob at all the technical bike stuff.... hah... Anyways... I think the bike looks great without the chain guard.... thinking of removing the sari guard too and leaving it open since I only ride solo... I'll post pics when I get the bike back tomorrow.... Thanks for the help!

Even I had fitted a Pirelli Sport Demon (110-90-18) in My ZMA-R & now the mech says the sprocket cant be changed without fitting the original MRF 100-90-18 back. Says it'll touch swingarm & not possible with Pirelli.

Any solution?

Yeah I don't know too much technical stuff about it... but according to my mechanic by putting a larger/wider tyre on the bike the strain on the sprocket is greater... therefore the sprocket wears out faster... dunno about the changability of it and all... but my mechanic made it sound like it wouldn't be a problem to change it again just that it will wear out sooner... I would get it checked by another mechanic and see what they say... perhaps castrol bike zone... they are pretty decent as far as advice goes I suppose?

HI

You should not allow anyone to bend the swingarm because alignment of both the swingarm forks will go at toss and it would be of no use,leading to tyre wear,wobbling,sprocket wear,chain snap and what not.

First of all I do not agree to the idea of going for a tyre size which cannot be accepted by the machine.If you are looking only for the aesthetics part of it then its ok but that machine can not be used for touring as its reliability goes down.

You have only one option left is to grind the swing arm or go to an expert mechanic,they have some good ideas like moving the wheel towards back and something like that.I am not an expert on this topic but yes try to do the minimum modification on the swing arm, its a structural member forget about breaking,removal of material from the swing arm reduces its torsional and structural stiffness and that will lead to flexing of swing arm which is not good at all for overall bike stability.
One should always choose a bigger tyre which will fit with ease without requiring any modifications to structural members.
One of my friend owns a pulsar and he had to put a additional chain tensioner due to the big size tyre and the chain tensioner now and then goes for a toss,due to its low quality and also the wrong design of the whole system

yeah

yeah I read on here and asked a lot of people who got the same tire as me put in the same bike... and they said only the chain cover needed to be cut... and rest all would be fine... and it is... I think quite a few people on this forum are using the same sirac tyre on the pulsar 180 ug3... but for some reason in my bike it is very slightly touching the swing arm at the "excess part." This is why I think that on my swing arm there is excess unneeded material... anyways I'm gonna be getting my bike back in a half hour... I'll post pictures of it and let you guys comment on if its ok or not... also can I go for a tuff up tube in this tyre or should it be fitted with a normal tube?

What logic is this ? .
AFAIK Sprocket CHANGING got nothing to do with a tyre !!

Now u got stock sprocket , again u ll put a stock sprocket .
What on earth is the difference would be the diff btw new n old sprocket

Am i missing something here ? .

@ Gopal

Dont touch the swingarm man .

results...

so got the bike back.... seems to ride better( no sound and the tyre moving freely) balance and all fine... my mechanic said that the welders put some more metal past or something when the the excess off so thats what that greenish stuff is... dunno bout that... but seems to run fine.... what do you guys think?

What is the original tyre's specification? 120/80 R17?? If yes, then the tyre that you have bought, 120/90 R17 is the wrong one. No wonder it scraps.

The '90' part is the aspect ratio, i.e., the sidewall height of the tyre. It is represented as a percentage of the tyre width. Thus, your new tyre's sidewall height is 90% of 120mm = 108mm whereas the original's is 80% of 120 = 96mm.

@spiderweb: Keep in mind that when you go for a wider tyre, make sure that you go lesser on the aspect ratio. The rule of thumb is for each 20mm increase in tyre width, the aspect ratio must be reduced by 10% in order to keep the overall tyre diameter constant.

ohh

yeah actually the original tyre was the MRF zapper c ( i think it was 100/90-17) the one i have on there now is the sirac which is 120/90-17... now its done so nothing to be done about it... lets see how it rides.... I got the swing arm "shaved" as you can see so now its not touching...even other p180 owners have used this tyre so I'm not too worried... thanks for the rule of thumb though... will def use it next time.

@OM:it does.Not only the sprocket per say but the entire chain sprocket assembly.
as the chain wears out & gives more play the gap between the swingarm & tyre increases.
This refers to frontwall gap & not sidewall.
As a result an older chain (more than 20-25 K kms) will allow you to fit a 120/90 whereas a new chain sprocket won't
Have burnt my fingers & know now

isnt thewre any neutral solution to put a new chain sprocket on? without changing the tyre! Afterall theres hardly any difference, previously it was 100-90-18 & now its 110-90-18

ideally it shouldn't in your case bhai...try again...the aspect ratio only makes difference w.r.t the chain & sprocket...
the 120/110/100 etc is only for width along the sides