Author Topic: im lost past 1983 new school bottom bracket question (Read 2712 times)

lammychop · « **on:** July 27, 2011, 04:34 PM »

my boy has a mongoose mischief entry level bike its 6months old he wants to replace the opc with a 3 piece what bottom bracket do i need

mattuknc · « **Reply #1 on:** July 27, 2011, 04:46 PM »

Any USA style sealed setup should fit it. Depending on the cranks axel size either 19mm or 22mm (19 is most common).

(or you can get a USA to Euro converter and get a Euro bb set, but I didn't want to complicate things.

)

kev-s · « **Reply #2 on:** July 27, 2011, 04:48 PM »

according to custom riders it has a mid bottom bracket

http://www.customriders.com/prodshow.asp?prodid=12302&cat=57&parent=1010&sid=3

basicly a mid bottom bracket is like a normal usa bb but u dont use the cups so you fit the bearings straight into the frame

lammychop · « **Reply #3 on:** July 27, 2011, 04:49 PM »

so the frame holes are all the same its just the spindals that are diferent is that right

lammychop · « **Reply #4 on:** July 27, 2011, 04:51 PM »

the bike in the link is a newer version with a 3 piece on it allready his has only got the one piece

kev-s · « **Reply #5 on:** July 27, 2011, 04:52 PM »

no the "frame hole" i.e frame's bottom bracket shell is the same size as a american bottom bracket sealed bearing without the cup, so just the bearing pushes into the frame with no cup

even the 2009 model uses a mid bottom bracket

the bike in the link has a 1 piece cranks

* Frame: Mongoose Freestyle BMX Frame
* Fork: Mongoose BMX fork
* Handlebars: 2pc BMX Design
* Front Hub: Mongoose 14mm
* Rear Hub: Mongoose Freewheel Hub 13T
* Rims: Alex 36H Front 48H Rear Rims
* Brakes: U Brake with Gyro Cable Detangler
* Tires: Mongoose designed tyres
* Pedals : Platform
* Cranks: 1pc 175mm Tubular crank
* Sprocket: 36T
* Mid Sealed Bottom Bracket
* Saddle: Mongoose shorty padded saddle
* Seat Post: Steel
* Grips: Mongoose OG Grip

oldtired · « **Reply #6 on:** July 27, 2011, 04:57 PM »

didn't know you could fit a 1 piece in a mid bb

learn something new every day, ,, it says a tubular 1piece too which suggests its hollow? bit confusing that i think , unlikely to be hollow but, if so then its going to be lighter than a 3pc although not as strong

Spen69 · « **Reply #7 on:** July 27, 2011, 05:00 PM »

Yeah, but if it currently has a opc then it's an older frame with a US BB. I had one and gave it to Jaymz for his nephew when we had a whip-round and it had a US BB on it.

You need to know what crank you intend to put on it and send a pic and we can tell you what BB to get. Send a pic of the bike to so we can be sure.

lammychop · « **Reply #8 on:** July 27, 2011, 05:00 PM »

ok bit confused it doesnt take much
this is the crank im trying to fit
could someone give me a link to a bb that will work with it

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=280714197572&ssPageName=STRK:MEWAX:IT

kev-s · « **Reply #9 on:** July 27, 2011, 05:06 PM »

opc cranks can be fitted to mid bottom brackets, best to put up a pic of the frame's bb just to be sure

jawbone cranks use a 19mm axle so u need a 19mm bottom bracket and your frame uses a mid bottom bracket according to custom riders website

so u need this 19mm bottom bracket

http://www.customriders.com/prodshow.asp?prodid=14051&cat=8&parent=1001&sid=3

lammychop · « **Reply #10 on:** July 27, 2011, 05:09 PM »

ok here the currant bb

oldtired · « **Reply #11 on:** July 27, 2011, 05:12 PM »

Quote from: lammychop on July 27, 2011, 05:00 PM

ok bit confused it doesnt take much
this is the crank im trying to fit
could someone give me a link to a bb that will work with it

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=280714197572&ssPageName=STRK:MEWAX:IT

Bargain

oldtired · « **Reply #12 on:** July 27, 2011, 05:13 PM »

that one is a us bb

kev-s · « **Reply #13 on:** July 27, 2011, 05:13 PM »

right that is a american bottom bracket, so the bike prob isnt 6 months old, maybe a couple of years

so u need this bottom bracket

http://www.winstanleysbikes.co.uk/product/21594/Profile_American_Standard_Cup__Bearing_Set

lammychop · « **Reply #14 on:** July 27, 2011, 05:15 PM »

Quote from: kev s on July 27, 2011, 05:13 PM

right that is a american bottom bracket, so the bike prob isnt 6 months old, maybe a couple of years

so u need this bottom bracket

http://www.winstanleysbikes.co.uk/product/21594/Profile_American_Standard_Cup__Bearing_Set

was defo new last christmas

lammychop · « **Reply #15 on:** July 27, 2011, 05:18 PM »

so i need a 19mm american bb is that correct

kev-s · « **Reply #16 on:** July 27, 2011, 05:19 PM »

strange that custom riders and a couple other sites show that the 2009 & 2011 has a mid bottom bracket in the spec list

maybe its a mistake by mongoose, when they released the spec list and it was ment to say american bottom bracket not mid bottom bracket

oh well your all sorted now

kev-s · « **Reply #17 on:** July 27, 2011, 05:20 PM »

yes u need a 19mm american bottom bracket for those cranks

lammychop · « **Reply #18 on:** July 27, 2011, 05:21 PM »

many thanks

oldtired · « **Reply #19 on:** July 27, 2011, 05:29 PM »

right thats old Lammychop's problem sorted, always get there in the end ,

, but how do you fit a 1pc in mid bb ?

kev-s · « **Reply #20 on:** July 27, 2011, 05:39 PM »

google tells me u cant due to the bottom bracket shell being too small to feed the 1 peice crank arm through

teach me not to believe everything i read

hunterdubber · « **Reply #21 on:** July 27, 2011, 05:42 PM »

Just a pic here's the mid bearings and the US sized (hop up kit) cups they fit in

Spen69 · « **Reply #22 on:** July 27, 2011, 07:42 PM »

19mm axle to US BB size in a sealed unit - here's a well kept secret for you bud at £13.99 plus £1.99 postage and it's even black to match the frame and crank

It's EXACTLY the same as a Redline Flight one but badged as Diamond Back, even down to the part numbers, so why pay over twice that price

http://www.ebay.co.uk/itm/bmx-bike-diamondback-sealed-bearing-bottom-bracket-bmx-/280701109987?pt=UK_sportsleisure_cycling_bikeparts_SR&hash=item415b1706e3

Bought half a dozen off this guy over the last few years and he's superfast delivery and spot on

lammychop · « **Reply #23 on:** July 27, 2011, 09:32 PM »

nice one spen just bought one

Spen69 · « **Reply #24 on:** July 27, 2011, 09:48 PM »

Quote from: lammychop on July 27, 2011, 09:32 PM

nice one spen just bought one

You're welcome bud

Author Topic: im lost past 1983 new school bottom bracket question (Read 2712 times)

mattuknc