Mechanics Quick Question Thread [Ask Questions Here]

PB Forum :: Mechanics' Lounge
Mechanics Quick Question Thread [Ask Questions Here]
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Posted: Mar 15, 2019 at 13:26 Quote
nojzilla wrote:
There are euro BB's for 3piece cranks but, I'd stay away from the internal bearing type as the bearings wear fast an the cups are prone to cracking leaving you withe nice job of removing the cracked part from the frame!

Profile do a nice external type BB but it's pricey, they also have longer axle widths for longer bb shells. I ran one on my NS majesty an all I needed was the standard width axle.

Any good bmx shop should be able to help you out

Literally just bought one of those profile mtb outboard bbs. Really nice piece.

Posted: Mar 15, 2019 at 13:36 Quote
seraph wrote:
NathanielK wrote:
I'm looking to build a dirt jump bike and I want to use bmx cranks because they're bombproof and cheap, but im unsure about compatibility. The frame is a transition pbj which fits a 73mm BSA Threaded BB, i have no idea how bmx bottom bracket standards work so i was wondering if anyone knows any bmx BB/crank combos that would work or how i could go about finding one?

First figure out which cranks you'd like to run. Most 3-piece and 2-piece BMX cranks use a 19mm spindle. Companies like Profile make external-bearing threaded BSA bottom brackets for 19mm cranks. The crankset should come with a variety of spacers which make fine-tuning the chainline pretty simple. Don't forget to choose a BMX chain ring that has the correct size hole for whatever size spindle you get.

Would a combination like this work?

Frame: https://www.transitionbikes.com/Bikes_2019_PBJFrameset.cfm
BB: https://www.profileracing.com/product/euro-internal-bottom-bracket/
Cranks: https://www.danscomp.com/products/452688/Mission_Transit_V2_Cranks.html
Sprocket: https://www.danscomp.com/products/458957/Cult_Dak_V2_Sprocket_(Dakota_Roche).html

Posted: Mar 15, 2019 at 13:56 Quote
NathanielK wrote:
seraph wrote:
NathanielK wrote:
I'm looking to build a dirt jump bike and I want to use bmx cranks because they're bombproof and cheap, but im unsure about compatibility. The frame is a transition pbj which fits a 73mm BSA Threaded BB, i have no idea how bmx bottom bracket standards work so i was wondering if anyone knows any bmx BB/crank combos that would work or how i could go about finding one?

First figure out which cranks you'd like to run. Most 3-piece and 2-piece BMX cranks use a 19mm spindle. Companies like Profile make external-bearing threaded BSA bottom brackets for 19mm cranks. The crankset should come with a variety of spacers which make fine-tuning the chainline pretty simple. Don't forget to choose a BMX chain ring that has the correct size hole for whatever size spindle you get.

Would a combination like this work?

Frame: https://www.transitionbikes.com/Bikes_2019_PBJFrameset.cfm
BB: https://www.profileracing.com/product/euro-internal-bottom-bracket/
Cranks: https://www.danscomp.com/products/452688/Mission_Transit_V2_Cranks.html
Sprocket: https://www.danscomp.com/products/458957/Cult_Dak_V2_Sprocket_(Dakota_Roche).html

Yes, but I would go for the regular Profile external bearing BB personally. Larger bearings equals longer life. https://www.profileracing.com/product/euro-externaloutboard-bottom-bracket/

Posted: Mar 15, 2019 at 14:54 Quote
seraph wrote:
NathanielK wrote:
seraph wrote:


First figure out which cranks you'd like to run. Most 3-piece and 2-piece BMX cranks use a 19mm spindle. Companies like Profile make external-bearing threaded BSA bottom brackets for 19mm cranks. The crankset should come with a variety of spacers which make fine-tuning the chainline pretty simple. Don't forget to choose a BMX chain ring that has the correct size hole for whatever size spindle you get.

Would a combination like this work?

Frame: https://www.transitionbikes.com/Bikes_2019_PBJFrameset.cfm
BB: https://www.profileracing.com/product/euro-internal-bottom-bracket/
Cranks: https://www.danscomp.com/products/452688/Mission_Transit_V2_Cranks.html
Sprocket: https://www.danscomp.com/products/458957/Cult_Dak_V2_Sprocket_(Dakota_Roche).html

Yes, but I would go for the regular Profile external bearing BB personally. Larger bearings equals longer life. https://www.profileracing.com/product/euro-externaloutboard-bottom-bracket/

Thanks!

Posted: Mar 15, 2019 at 15:41 Quote
old-banshee-rider wrote:
TBaggins wrote:
old-banshee-rider wrote:
I'm switching front and rear rotors from 180 to 203mm. I currently have Shimano SM-MA-F180P/P2 on there right now with the 180mm rotors. Can someone confirm that I need Shimano F203P/P adapters to run the 203mm rotors?

That should be correct for the Fork, but you'll need the R203P/P for the rear triangle unless you have IS brake mounts in which case it would be R203P/S. Good on ya for matching rotor sizes front and rear

Thanks. I don't know if a 203 rotor will be too much and hard to modulate but I'll give it a try.
Not all forks are rated to handle the stress of a 203 rotor, have you checked this for your fork? Just cuz there's an adapter that makes it possible doesn't mean you should.

Posted: Mar 15, 2019 at 16:38 Quote
Duderz7 wrote:
old-banshee-rider wrote:
TBaggins wrote:


That should be correct for the Fork, but you'll need the R203P/P for the rear triangle unless you have IS brake mounts in which case it would be R203P/S. Good on ya for matching rotor sizes front and rear

Thanks. I don't know if a 203 rotor will be too much and hard to modulate but I'll give it a try.
Not all forks are rated to handle the stress of a 203 rotor, have you checked this for your fork? Just cuz there's an adapter that makes it possible doesn't mean you should.

2017 Yari with new Charger 2 and Debonair should be okay?

Posted: Mar 15, 2019 at 16:39 Quote
Lol Yari's a beefcake; should be fine.

Posted: Mar 15, 2019 at 17:23 Quote
Been running a 203 rotor on a recon for about a year and half. You're good.

Posted: Mar 15, 2019 at 17:38 Quote
old-banshee-rider wrote:
Duderz7 wrote:
old-banshee-rider wrote:


Thanks. I don't know if a 203 rotor will be too much and hard to modulate but I'll give it a try.
Not all forks are rated to handle the stress of a 203 rotor, have you checked this for your fork? Just cuz there's an adapter that makes it possible doesn't mean you should.

2017 Yari with new Charger 2 and Debonair should be okay?
Yup, no prob. Just mentioned it cuz I've seen people do weird things...8 inch rotors on spindly xc forks.

Posted: Mar 16, 2019 at 9:50 Quote
dhmtbr777 wrote:
Yeah your never going to get a concrete answer. I really like TRP right now.

This

Posted: Mar 16, 2019 at 17:05 Quote
https://www.commencalusa.com/meta-ht-am-origin-2019-c2x26304817


Does anyone have this bike, if so is this a good buy? I know the brakes are lower end, but that's an easy upgrade

Posted: Mar 16, 2019 at 18:50 Quote
simonangier wrote:
https://www.commencalusa.com/meta-ht-am-origin-2019-c2x26304817


Does anyone have this bike, if so is this a good buy? I know the brakes are lower end, but that's an easy upgrade
The fork is kinda meh a lyrik on it would be sweet

Posted: Mar 16, 2019 at 19:31 Quote
cyberoptixs wrote:
simonangier wrote:
https://www.commencalusa.com/meta-ht-am-origin-2019-c2x26304817


Does anyone have this bike, if so is this a good buy? I know the brakes are lower end, but that's an easy upgrade
The fork is kinda meh a lyrik on it would be sweet
Same here, id go next one up.

Posted: Mar 16, 2019 at 20:35 Quote
Im looking to build a dirt jump bike (Transition PBJ) but I'm having trouble understanding how headsets work (this is my first time trying to build a bike) transition's website says the headset is 44mm Zero Stack (Top) / 44mm External (Bottom). What does this mean? How do headsets work? Does anyone have any suggestions of headsets that would work with this frame? im looking for something not to expensive but not so cheap that its gonna be problematic.

Posted: Mar 16, 2019 at 20:42 Quote
I have a chance to buy a 2017 Raleigh tokul 3 but it has been fully upgraded with Specialized Dropper Post, Rock Shox Yari Fork, Diety Black Label Handlebar and more. I could get for like 730, is that a good idea, the bike is in great condition or should I get the new Commencal meta ht am origin and just upgrade from there, and the nice thing is the frame has internal routing for the cables.


 
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