shimano sis mf hs20

loki12

hi there
i am new to this so sorry if this has been asked before
can anyone help. i am looking for a replacement for my shimano sis mf hs20 rear cogs not sure if its a cassette or not. its on my exodus tremor xc. the front drive cog is also worn and i would like to replace this as well it has no markings on it but the name dotek on it with 3 cogs. they are on a fairly cheap bike of its day and i dont wont to go made and spend more than the bikes worth but dont want to bin the bike either if that's possible .

thanks for your help

supersonic

We are going to need pictures of the parts to help, if you can.

loki12

supersonic wrote:

We are going to need pictures of the parts to help, if you can.

these are the parts i would like to change the reason being the chain keeps slipping and chain comes off every now and then


thanks for getting back to me so quick

nicklouse

It is a spin on freewheel and looks like a basic square taper crankset.

I guess standard threaded fitting but as I can't see that is a guess.

loki12

ok so what can i replace it with any recommendations as i have no clue about the terms that you are using and thanks again for your help

dont know if this helps any or if you would need me to strip it down

Chunkers1980

That mech is no use off road, it will come off. For, 80 quid youd get something better second hand.

loki12

thanks for that i thought as much i was using it for work but just getting into off road any idea as to what i should look for 80 quid makes models as i have not got a clue what you meant by that mech is no use off road bit of a noob to this

supersonic

The whole chainset needs replacing as the rings look riveted on (with fake allen head bolts).

The rear freewheel does not look worn. Infact I would replace the chain and rear mech, and gear cables and see how it fairs.

http://www.amazon.co.uk/dp/B007VBWTGE/r ... B007VBWTGE

http://www.amazon.co.uk/dp/B005PVLWC4/r ... B005PVLWC4

Or get something new, take a look at Halfords and Decathlons budget models.

loki12

i think you are right about the chain set as i have tried to get it off before and they will not budge and the allen key will not go into some of them .
i would like to give the chain and rear mech a go but if it needs a new chainset and it cost 20+ then i think i would be better trying to get a better off road bike second hand or have a look at the halfords and Decathlons

thanks again for your help

supersonic

What is the most you can afford? As a £200 bike is vastly better off road than a £100 bike.

loki12

supersonic wrote:

What is the most you can afford? As a £200 bike is vastly better off road than a £100 bike.

I could go to 100 now but i think i might try to fix this with chain and rear mesh and then save for something around 200 but would still be intrested in your thoughts on a good offroad bike for that money either new or second hand

supersonic

If you could stretch to this:

http://www.ebay.co.uk/itm/NEW-Python-Ul ... %26ps%3D54

Unheard of to get a gear set like this for this money, workable suspension: bargain.

loki12

supersonic wrote:

If you could stretch to this:

http://www.ebay.co.uk/itm/NEW-Python-Ul ... %26ps%3D54

Unheard of to get a gear set like this for this money, workable suspension: bargain.

Added to the watched list will have to do a bit of ot to get it though thanks for your help gave me plenty to think about think i will give the chain rear mech a shot and then save for a better bike cant do any harm

The Rookie

I have a shed full of useable bits, if you want a good rear mech and chain and even crankset I'll have something you could use, most for a pint plus P&P, PM me if your interested.

Simon

loki12

Hi there

I replaced the chain and rear mech today but have noticed a wobble in the back gears. i took the wheel off and took out the axle it was bent so replaced that but the gears still wobbles the wheel seem to run true.

i also tightened the gears up as much i could but still they wobble will i need to get a knew set of gears.

Thanks again for your help

cooldad

Wobble is fine as long as it shifts.

loki12

Yes it still shift so good to go will git out on it then thanks for that

loki12

Was out yesterday and the gears have been jumping all over the place dosnt happen so much in the middle front and middle 3 rear cogs but still jumps when i put pressure on going up hill i had noticed when i hand crank it there was a stiff link that i have freed off but still it jumps i did notice that the chain dosnt sit well on the rear cogs the barrels will hit the top of the cog rather than fall into the u shape of the cogs every now and then I was wondering if the chain i got a gusset 8 speed 116L 3/32 was ok or could this be the problem

Thanks again for your help