EZZ99 Posted October 23, 2015 Posted October 23, 2015 Hi I'm totally new to the bike scene. I have a Raleigh RC7000 microsoft edition with a silver Shimano ultegra groupset. Not sure what model it is or even the lenght. The teeth on my cranks seems to be wearing off. Does it mean i need a new one.? Would appreciate some advice please. Thanks
Pure Savage Posted October 23, 2015 Posted October 23, 2015 Hi I'm totally new to the bike scene. I have a Raleigh RC7000 microsoft edition with a silver Shimano ultegra groupset. Not sure what model it is or even the lenght. The teeth on my cranks seems to be wearing off. Does it mean i need a new one.? Would appreciate some advice please. Thanks Please post a picture. But yes, replacing if they are worn out and reliability becomes an issue. How many km have you done on the bike to get that much wear?
shaper Posted October 23, 2015 Posted October 23, 2015 You only need to replace the crank chainrings which are worn and not the whole crank First you need to see what chainring sizes you have, normally 53 and 39 if a standard crank in which case you will need to buy a new 53T and/or 39T chainring If it is a compact crank then will be 50 and 34T You will be able to get the chainrings from your local bike shop
Martin PJ Posted October 23, 2015 Posted October 23, 2015 Get new chain ring for the big one. You need to measure BCD of the chain ring. This is the maximum diameter centre to centre of the holes for the chain ring bolts. It will 130 mm BCD, something like that, with 5 bolts. A new chain ring and chain will make a big difference to your riding.
Jonesy Posted October 23, 2015 Posted October 23, 2015 Careful. First ride on a second hand bike a month ago, and I crashed badly due to worn ring. Smashed left knee, so this can be real hazardous.
Eugene Posted October 23, 2015 Posted October 23, 2015 When you change the chain is when your problems really start with a worn chain ring.
HowardSteele Posted October 23, 2015 Posted October 23, 2015 Have a look at the link below...Also have a look what a new Ring looks like (Same size same make ) compared to yourshttp://utahmountainbiking.com/fix/chainrng.htm
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