Mountain Bike Reviews Forum banner
1 - 7 of 7 Posts

·
3 "fiddy" for short
Joined
·
2,739 Posts
Discussion Starter · #1 ·
I currently have a Thomson Elite stem in 120mm and 5* rise. The handlebar that I am using has a 1" rise and 8* sweep. I am looking to move up to an oversized bar (31.8) with a 1.5 inch rise. Now, if I use a 10* rise Thomson X4 stem in 110mm in conjunction with this 1.5 inch rise bar, how will it affect the position of the handlebars?

Currently my bike has an effective TT of 23.9 inches and I feel comfortable with the 120mm stem with a 5* rise. I want to lower the stem on the steerer a little bit as well as slightly opening up my riding position. How much affect will I see with this 31.8 combo as compared to my current setup?
 

·
Map Maker
Joined
·
1,244 Posts
If you feel comfortable with 120mm and 5* of rise feels comfortable why change it?

your new stem is Shorter and had 5* MORE rise plus you wil have another .5" or ride from your new bars.
wou will sit more up right and you reach will be shorter. Your steering will also be quicker.
You might be able to lower your new stem on the steerer some to help compensate for the increase in rise but you are talking almost an 1"
so must have a bunch of spacers to swap around in order for it to work.
but remember your new stem is also 10mm shorter.
 

·
Premium Member
Joined
·
48,238 Posts
cbchess said:
If you feel comfortable with 120mm and 5* of rise feels comfortable why change it?

your new stem is Shorter and had 5* MORE rise plus you wil have another .5" or ride from your new bars.
wou will sit more up right and you reach will be shorter. Your steering will also be quicker.
You might be able to lower your new stem on the steerer some to help compensate for the increase in rise but you are talking almost an 1"
so must have a bunch of spacers to swap around in order for it to work.
but remember your new stem is also 10mm shorter.
And the additional rise makes the effective reach shorter yet.

Stem clamp height has an affect on the actual reach/rise of a stem, too. You can really only directly compare stems of the same model/design.
 

·
3 "fiddy" for short
Joined
·
2,739 Posts
Discussion Starter · #5 ·
cbchess said:
If you feel comfortable with 120mm and 5* of rise feels comfortable why change it?

your new stem is Shorter and had 5* MORE rise plus you wil have another .5" or ride from your new bars.
wou will sit more up right and you reach will be shorter. Your steering will also be quicker.
You might be able to lower your new stem on the steerer some to help compensate for the increase in rise but you are talking almost an 1"
so must have a bunch of spacers to swap around in order for it to work.
but remember your new stem is also 10mm shorter.
I should have clarified, but I am not looking for a drastic change. Like I said, I am quite comfortable with this bar position. I just want to adjust a little to keep the same general bar position while opening up my riding position slightly. You are correct in saying that there would be a 1" drop on the steerer to keep the same position if I used the 10* rise with a 1.5 inch riser bar. So, in order for me to upgrade to the 31.8 while using the X4 (that only comes in 10*and 0*) I'm wondering what be the best combo to achieve this keeping in mind I would like to lower the stem on the steerer by a few mm or so.
 

·
Registered
Joined
·
2,822 Posts
be350ka said:
I should have clarified, but I am not looking for a drastic change. Like I said, I am quite comfortable with this bar position. I just want to adjust a little to keep the same general bar position while opening up my riding position slightly. You are correct in saying that there would be a 1" drop on the steerer to keep the same position if I used the 10* rise with a 1.5 inch riser bar. So, in order for me to upgrade to the 31.8 while using the X4 (that only comes in 10*and 0*) I'm wondering what be the best combo to achieve this keeping in mind I would like to lower the stem on the steerer by a few mm or so.
assuming they have the same stack height, this is what you're looking at. (they're 1.5mm different, so it doesn't affect thing much in this example)...

i've got a couple different MS Excel spreadsheets to fool around with. I got them from guys on here. One takes into acct stack height & both take into acct head angle.
no way to upload them here though, so if you want 'em, shoot me an email or pm.
**anybody got a place to host some files like these?**
 

Attachments

·
3 "fiddy" for short
Joined
·
2,739 Posts
Discussion Starter · #7 ·
logbiter said:
assuming they have the same stack height, this is what you're looking at. (they're 1.5mm different, so it doesn't affect thing much in this example)...

i've got a couple different MS Excel spreadsheets to fool around with. I got them from guys on here. One takes into acct stack height & both take into acct head angle.
no way to upload them here though, so if you want 'em, shoot me an email or pm.
**anybody got a place to host some files like these?**
Thanks Logbiter. I think I will take you up on that offer. Check your PM.:D
 
1 - 7 of 7 Posts
Top